Hadronic photon-photon interactions at high energies

DESY06-023ISSN0418-9833 March2006Diffractive Photoproduction ofρMesonswith Large Momentum Transfer at HERAH1CollaborationAbstractThe diffractive photoproduction ofρmesons,ep→eρY,with large momentum trans-fer squared at the proton vertex,|t|,is studied with the H1detector at HERA using anintegrated luminosity of20.1pb−1.The photon-proton centre of mass energy spans therange75<W<95GeV,the photon virtuality is restricted to Q2<0.01GeV2and themass M Y of the proton remnant is below5GeV.The t dependence of the cross sectionis measured for the range1.5<|t|<10.0GeV2and is well described by a power law,dσ/d|t|∝|t|−n.The spin density matrix elements,which provide information on the he-licity structure of the interaction,are extracted using measurements of angular distributionsof theρdecay products.The data indicate a violation of s-channel helicity conservation,with contributions from both single and double helicity-flip being observed.The results arecompared to the predictions of perturbative QCD models.Submitted to Phys.Lett.BA.Aktas9,V.Andreev25,T.Anthonis3,B.Antunovic26,S.Aplin9,A.Asmone33,A.Astvatsatourov3,A.Babaev24,†,S.Backovic30,A.Baghdasaryan37,P.Baranov25,E.Barrelet29,W.Bartel9,S.Baudrand27,S.Baumgartner39,J.Becker40,M.Beckingham9, O.Behnke12,O.Behrendt6,A.Belousov25,N.Berger39,ot27,M.-O.Boenig6,V.Boudry28,J.Bracinik26,G.Brandt12,V.Brisson27,D.Bruncko15,F.W.B¨u sser10,A.Bunyatyan11,37,G.Buschhorn26,L.Bystritskaya24,A.J.Campbell9,F.Cassol-Brunner21, K.Cerny32,V.Cerny15,46,V.Chekelian26,J.G.Contreras22,J.A.Coughlan4,B.E.Cox20,G.Cozzika8,J.Cvach31,J.B.Dainton17,W.D.Dau14,K.Daum36,42,Y.de Boer24,B.Delcourt27,M.Del Degan39,A.De Roeck9,44,E.A.De Wolf3,C.Diaconu21,V.Dodonov11, A.Dubak30,45,G.Eckerlin9,V.Efremenko24,S.Egli35,R.Eichler35,F.Eisele12,A.Eliseev25, E.Elsen9,S.Essenov24,A.Falkewicz5,P.J.W.Faulkner2,L.Favart3,A.Fedotov24,R.Felst9, J.Feltesse8,J.Ferencei15,L.Finke10,M.Fleischer9,P.Fleischmann9,G.Flucke33,A.Fomenko25,G.Franke9,T.Frisson28,E.Gabathuler17,E.Garutti9,J.Gayler9,C.Gerlich12, S.Ghazaryan37,S.Ginzburgskaya24,A.Glazov9,I.Glushkov38,L.Goerlich5,M.Goettlich9, N.Gogitidze25,S.Gorbounov38,C.Grab39,T.Greenshaw17,M.Gregori18,B.R.Grell9,G.Grindhammer26,C.Gwilliam20,D.Haidt9,L.Hajduk5,M.Hansson19,G.Heinzelmann10, R.C.W.Henderson16,H.Henschel38,G.Herrera23,M.Hildebrandt35,K.H.Hiller38,D.Hoffmann21,R.Horisberger35,A.Hovhannisyan37,T.Hreus3,43,S.Hussain18,M.Ibbotson20,M.Ismail20,M.Jacquet27,L.Janauschek26,X.Janssen3,V.Jemanov10,L.J¨o nsson19,D.P.Johnson3,A.W.Jung13,H.Jung19,9,M.Kapichine7,J.Katzy9,I.R.Kenyon2,C.Kiesling26,M.Klein38,C.Kleinwort9,T.Klimkovich9,T.Kluge9,G.Knies9, A.Knutsson19,V.Korbel9,P.Kostka38,K.Krastev9,J.Kretzschmar38,A.Kropivnitskaya24, K.Kr¨u ger13,ndon18,nge38,ˇs toviˇc ka38,32,ˇs toviˇc ka-Medin30,ycock17,A.Lebedev25,G.Leibenguth39,V.Lendermann13,S.Levonian9,L.Lindfeld40, K.Lipka38,A.Liptaj26,B.List39,J.List10,E.Lobodzinska38,5,N.Loktionova25,R.Lopez-Fernandez23,V.Lubimov24,A.-I.Lucaci-Timoce9,H.Lueders10,D.L¨u ke6,9,T.Lux10,L.Lytkin11,A.Makankine7,N.Malden20,E.Malinovski25,S.Mangano39,P.Marage3,R.Marshall20,M.Martisikova9,H.-U.Martyn1,S.J.Maxfield17,A.Mehta17,K.Meier13,A.B.Meyer9,H.Meyer36,J.Meyer9,V.Michels9,S.Mikocki5,cewicz-Mika5,stead17,D.Mladenov34,A.Mohamed17,F.Moreau28,A.Morozov7,J.V.Morris4,M.U.Mozer12,K.M¨u ller40,P.Mur´ın15,43,K.Nankov34,B.Naroska10,Th.Naumann38,P.R.Newman2,C.Niebuhr9,A.Nikiforov26,G.Nowak5,K.Nowak40,M.Nozicka32,R.Oganezov37,B.Olivier26,J.E.Olsson9,S.Osman19,D.Ozerov24,V.Palichik7,I.Panagoulias9,T.Papadopoulou9,C.Pascaud27,G.D.Patel17,H.Peng9,E.Perez8,D.Perez-Astudillo22,A.Perieanu9,A.Petrukhin24,D.Pitzl9,R.Plaˇc akyt˙e26,B.Portheault27,B.Povh11,P.Prideaux17,A.J.Rahmat17,N.Raicevic30,P.Reimer31,A.Rimmer17,C.Risler9,E.Rizvi18,P.Robmann40,B.Roland3,R.Roosen3,A.Rostovtsev24,Z.Rurikova26,S.Rusakov25,F.Salvaire10,D.P.C.Sankey4,E.Sauvan21, S.Sch¨a tzel9,S.Schmidt9,S.Schmitt9,C.Schmitz40,L.Schoeffel8,A.Sch¨o ning39,H.-C.Schultz-Coulon13,F.Sefkow9,R.N.Shaw-West2,I.Sheviakov25,L.N.Shtarkov25,T.Sloan16,P.Smirnov25,Y.Soloviev25,D.South9,V.Spaskov7,A.Specka28,M.Steder9,B.Stella33,J.Stiewe13,U.Straumann40,D.Sunar3,V.Tchoulakov7,G.Thompson18,P.D.Thompson2,T.Toll9,F.Tomasz15,D.Traynor18,P.Tru¨o l40,I.Tsakov34,G.Tsipolitis9,41, I.Tsurin9,J.Turnau5,E.Tzamariudaki26,K.Urban13,M.Urban40,ik25,D.Utkin24, A.Valk´a rov´a32,C.Vall´e e21,P.Van Mechelen3,A.Vargas Trevino6,Y.Vazdik25,C.Veelken17, S.Vinokurova9,V.V olchinski37,K.Wacker6,G.Weber10,R.Weber39,D.Wegener6,1C.Werner12,M.Wessels9,B.Wessling9,Ch.Wissing6,R.Wolf12,E.W¨u nsch9,S.Xella40, W.Yan9,V.Yeganov37,J.ˇZ´aˇc ek32,J.Z´a leˇs´a k31,Z.Zhang27,A.Zhelezov24,A.Zhokin24, Y.C.Zhu9,J.Zimmermann26,T.Zimmermann39,H.Zohrabyan37,and F.Zomer271I.Physikalisches Institut der RWTH,Aachen,Germany a2School of Physics and Astronomy,University of Birmingham,Birmingham,UK b3Inter-University Institute for High Energies ULB-VUB,Brussels;Universiteit Antwerpen, Antwerpen;Belgium c4Rutherford Appleton Laboratory,Chilton,Didcot,UK b5Institute for Nuclear Physics,Cracow,Poland d6Institut f¨u r Physik,Universit¨a t Dortmund,Dortmund,Germany a7Joint Institute for Nuclear Research,Dubna,Russia8CEA,DSM/DAPNIA,CE-Saclay,Gif-sur-Yvette,France9DESY,Hamburg,Germany10Institut f¨u r Experimentalphysik,Universit¨a t Hamburg,Hamburg,Germany a11Max-Planck-Institut f¨u r Kernphysik,Heidelberg,Germany12Physikalisches Institut,Universit¨a t Heidelberg,Heidelberg,Germany a13Kirchhoff-Institut f¨u r Physik,Universit¨a t Heidelberg,Heidelberg,Germany a14Institut f¨u r Experimentelle und Angewandte Physik,Universit¨a t Kiel,Kiel,Germany15Institute of Experimental Physics,Slovak Academy of Sciences,Koˇs ice,Slovak Republic f 16Department of Physics,University of Lancaster,Lancaster,UK b17Department of Physics,University of Liverpool,Liverpool,UK b18Queen Mary and Westfield College,London,UK b19Physics Department,University of Lund,Lund,Sweden g20Physics Department,University of Manchester,Manchester,UK b21CPPM,CNRS/IN2P3-Univ.Mediterranee,Marseille-France22Departamento de Fisica Aplicada,CINVESTAV,M´e rida,Yucat´a n,M´e xico j23Departamento de Fisica,CINVESTAV,M´e xico j24Institute for Theoretical and Experimental Physics,Moscow,Russia k25Lebedev Physical Institute,Moscow,Russia e26Max-Planck-Institut f¨u r Physik,M¨u nchen,Germany27LAL,Universit´e de Paris-Sud,IN2P3-CNRS,Orsay,France28LLR,Ecole Polytechnique,IN2P3-CNRS,Palaiseau,France29LPNHE,Universit´e s Paris VI and VII,IN2P3-CNRS,Paris,France30Faculty of Science,University of Montenegro,Podgorica,Serbia and Montenegro e31Institute of Physics,Academy of Sciences of the Czech Republic,Praha,Czech Republic h 32Faculty of Mathematics and Physics,Charles University,Praha,Czech Republic h33Dipartimento di Fisica Universit`a di Roma Tre and INFN Roma3,Roma,Italy34Institute for Nuclear Research and Nuclear Energy,Sofia,Bulgaria e35Paul Scherrer Institut,Villigen,Switzerland36Fachbereich C,Universit¨a t Wuppertal,Wuppertal,Germany37Yerevan Physics Institute,Yerevan,Armenia38DESY,Zeuthen,Germany39Institut f¨u r Teilchenphysik,ETH,Z¨u rich,Switzerland i40Physik-Institut der Universit¨a t Z¨u rich,Z¨u rich,Switzerland i241Also at Physics Department,National Technical University,Zografou Campus,GR-15773 Athens,Greece42Also at Rechenzentrum,Universit¨a t Wuppertal,Wuppertal,Germany43Also at University of P.J.ˇSaf´a rik,Koˇs ice,Slovak Republic44Also at CERN,Geneva,Switzerland45Also at Max-Planck-Institut f¨u r Physik,M¨u nchen,Germany46Also at Comenius University,Bratislava,Slovak Republic†Deceaseda Supported by the Bundesministerium f¨u r Bildung und Forschung,FRG,under contract numbers05H11GUA/1,05H11PAA/1,05H11PAB/9,05H11PEA/6,05H11VHA/7and 05H11VHB/5b Supported by the UK Particle Physics and Astronomy Research Council,and formerly by the UK Science and Engineering Research Councilc Supported by FNRS-FWO-Vlaanderen,IISN-IIKW and IWT and by Interuniversity Attraction Poles Programme,Belgian Science Policyd Partially Supported by the Polish State Committee for Scientific Research,SPUB/DESY/P003/DZ118/2003/2005e Supported by the Deutsche Forschungsgemeinschaftf Supported by VEGA SR grant no.2/4067/24g Supported by the Swedish Natural Science Research Councilh Supported by the Ministry of Education of the Czech Republic under the projects LC527and INGO-1P05LA259i Supported by the Swiss National Science Foundationj Supported by CONACYT,M´e xico,grant400073-Fk Partially Supported by Russian Foundation for Basic Research,grants03-02-17291and04-02-1644531IntroductionDiffractive vector meson production in ep interactions with large negative four-momentumtransfer squared at the proton vertex,t,provides a powerful means to probe the nature of thediffractive exchange.It has been proposed as a process in which Quantum Chromodynamics(QCD)effects predicted by the BFKL evolution equation[1,2]could be observed.Theoreti-cally,the large momentum transfer provides the hard scale necessary for the application of per-turbative QCD(pQCD)models.In such models,diffractive vector meson production is viewed,in the proton rest frame,as a sequence of three processes well separated in time:the intermedi-ate photonfluctuates into a q¯q pair;the q¯q pair is involved in a hard interaction with the protonvia the exchange of a colour singlet state,and the q¯q pair recombines to form a vector meson.Atleading order(LO),the interaction between the q¯q pair and the proton is represented by the ex-change of two gluons.Beyond LO,the exchange of a gluon ladder has to be considered which,in the leading logarithm(LL)approximation,can be described by the BFKL equation.Thetreatment of the formation of the vector meson,which is a non-perturbative process,involves aparameterisation of the meson wavefunction.At high|t|,the t dependence of vector meson production and of the spin density matrix elementshas been measured in photoproduction by ZEUS[3](ρ,φ,J/ψ)and H1[4,5](J/ψ,ψ(2s)).H1has also measured the t dependence of the spin density matrix elements for theρmeson at high|t|in electroproduction[6].The data on light vector meson production(ρ,φ)at large|t|indicate a violation of s-channel helicity conservation(SCHC),i.e.the non-conservation of the helicitybetween the exchanged photon and the vector meson.This is in contrast to measurements ofthe heavier J/ψmeson,where s-channel helicity is seen to be conserved[3,4].This paper presents new measurements of the diffractive production ofρmesons at large|t|,inthe range1.5<|t|<10GeV2:ep→eρY;ρ→π+π−,(1) in the photoproduction regime,i.e.Q2≃0GeV2where Q2is the modulus of the squared four momentum carried by the intermediate photon.The system Y represents either an elastically scattered proton or a low mass dissociated system.A clean signature and low background rates make this process experimentally attractive and it is possible to precisely determine the kine-matics of the process through an accurate measurement of the vector meson four momentum. The dependence on t of the cross section is measured and the spin density matrix elements are extracted,which provide information on the helicity structure of the interaction.2Perturbative QCD ModelsPerturbative QCD calculations at leading order(two-gluon exchange)have been performed for high|t|vector meson photoproduction in[7].For light vector mesons,these calculations indicate that,although the initial photon is transversely polarised,the vector meson is produced predominantly in a longitudinal state.Intuitively,this can be understood as follows.Since the light quark and antiquark have opposite helicities(chiral-even configuration),the pair must be in4an orbital momentum state with projection L z=±1onto the photon axis,in order to conserve the photon spin projection.The hard interaction between the dipole and the gluon system doesnot affect the dipole size nor the quark and antiquark helicities,but modifies the dipole line offlight.This implies a damping by a factor∝1/|t|of the probability of measuring the valueL z=±1for the projection of the dipole angular momentum onto its line offlight,and hence of transversely polarised vector meson production.However,in contrast to these pQCD expectations,experimental observations indicate that lightvector mesons are produced predominantly in a transverse polarisation state[3].Asfirst realisedin[8]an enhanced production of transversely polarisedρmesons can be accounted for by thepossibility for a real photon to couple to a q¯q pair in a chiral-odd spin configuration even in thecase of light quarks1.The data presented in this paper are compared to two theoretical predictions:afixed order cal-culation in which the hard interaction is approximated by the exchange of two gluons2,and aLL calculation in which it is described according to the BFKL evolution.In both cases,thechiral-odd component of the photon wavefunction is obtained by giving the quarks a“con-stituent quark mass”m=m V/2,where m V is the mass of the vector meson,and a set of QCD light-cone wavefunctions for the vector meson[11]is used.The BFKL calculation is described in[9,10].The BFKL resummation cures some possibleinstabilities which might affect the two-gluon predictions[1].The expansions on the light-coneof the relevant hadronic matrix elements are performed up to twist-3,i.e.next-to-leading twist.The leading logarithm nature of the calculation prevents an absolute prediction for the normal-isation of the cross sections,due to the presence of an undefined energy scaleΛ.In[9,10]thisscale is allowed to run with t according toΛ2=m2V−γt,whereγis a free parameter.The value of the strong coupling constant isfixed since this is appropriate in the LL approximation andhas proved successful[12,13]in describing previous data.The parameter values,as obtainedfrom afit to the ZEUS data in[3],are:γ=1.0andαBF KL=0.20[14].s3Data Analysis3.1Event SelectionThe data used for the present analysis were taken with the H1detector in the year2000andcorrespond to an integrated luminosity of20.1pb−1.In this period,the energies of the HERA 1Note that in the case of heavy vector mesons,the relevant non-relativistic wavefunction,with equal sharing of the photon longitudinal momentum by the two heavy quarks,ensures that the amplitude for producing a longitu-dinally polarised meson vanishes.Only the chiral-odd amplitude,which is naturally present due to the non-zero quark mass,remains.Hence heavy vector mesons are expected to be transversely polarised,as confirmed by the experimental observations.2The two-gluon model predictions for the kinematic region considered here were provided by the authors of[9,10].The model differs from that proposed in[8]in the way the chiral-odd configurations are introduced.5proton and positron beams were920GeV and27.5GeV,respectively.The kinematic domain of the measurement is:Q2<0.01GeV275<W<95GeV1.5<|t|<10GeV2M Y<5GeV(2) where W is the photon-proton centre of mass energy and M Y is the mass of the proton remnant system.The relevant parts of the detector,for which more details can be found in[15],are the central tracking detector(which covers the polar angular range20◦<θ<160◦),the liquid argon (LAr)calorimeter(which covers the polar angular range4◦<θ<154◦)and an electron tagger located at44m from the interaction point,which detects the scattered positron at a small angle to the backward direction3.The44m electron tagger is a2×3array ofˇCerenkov crystal calorimeters used to select photoproduction events in the range Q2<0.01GeV2.The trigger system used in this analysis selects events with an energy deposit greater than10GeV in the 44m electron tagger,at least one charged track with a transverse momentum above400MeV in the central tracker and a reconstructed interaction vertex.Additionally,there is a veto on the amount of energy deposited in the forward region of the LAr.Events corresponding to reaction(1),in the kinematic range defined by relations(2),are se-lected by requesting:•the reconstruction of an energy deposit of more than15GeV in the44m electron tagger (the scattered positron candidate);•the reconstruction in the central tracking detector of the trajectories of exactly two oppo-sitely charged particles(pion candidates)with transverse momenta larger than150MeV and polar angles within20o<θ<155o.In order to ensure a well understood trigger efficiency,at least one track is required to have a transverse momentum above450MeV;•the absence of any localised energy deposit larger than400MeV in the LAr calorimeter which is not associated with either of the two reconstructed tracks.This cut reduces backgrounds due to the diffractive production of systems decaying into two charged and additional neutral particles.Further,it limits the mass of the proton dissociative system to M Y<∼5GeV which ensures that the events lie within the diffractive regime M Y≪W.Restricting the analysis to low values of M Y also reduces the uncertainties arising from the parametrisation of the M Y dependence of the cross section;•events in the mass range0.6<Mππ<1.1GeV and discarding events with M KK<1.04GeV,where Mππand M KK are the invariant masses of the two selected tracks when considered as pions or kaons respectively(no explicit hadron identification is performed for this analysis).The latter cut reduces the background due to diffractive production ofφmesons.3In the H1convention,the z axis is defined by the colliding beams,the forward direction being that of the outgoing proton beam and the backward direction that of the positron beam.Transverse and longitudinal momenta are defined with respect to the proton beam direction.6Thefinal sample consists of2628events.Further details of this analysis may be found in[16].3.2Kinematics and Helicity StructureThe three momentum of theρmeson is computed as the sum of the two charged pion candidate momenta.The variable W is reconstructed from theρmeson,rather than from the energy of the scattered positron candidate which is less precisely measured by the electron tagger,using the Jacquet-Blondel method[17]:W2≃2E p(Eρ−p z,ρ)(3) where E p is the energy of the incoming proton and Eρand p z,ρare the energy and longitudinal momentum of theρmeson,respectively.In the photoproduction regime,the variable t is well approximated by the negative transverse momentum squared of theρmeson,t≃−p2t,ρ.The measurement of the production and decay angular distributions provides information on the helicity structure of the interaction.Three angles are defined[18]as illustrated in Fig.1:Φis the angle between theρproduction plane(defined as the plane containing the virtual photon and theρmeson)and the positron scattering plane in theγp centre of mass system;θ∗is the polar angle of the positively charged decay pion in theρrest frame with respect to the meson direction as defined in theγp centre of mass frame andφ∗is its azimuthal angle relative to the ρproduction plane.In this paper,the distributions of the anglesφ∗andθ∗are analysed(the angleΦis not acces-sible in photoproduction)giving access to the spin density matrix elements r0400,Re[r0410]and r041−1[19].For aρmeson decaying into two pions,the normalised two-dimensional angular distribution[19],averaged overΦ,is1σd2σd cosθ∗dφ∗=34π 12(1−r0400)+12(3r0400−1)cos2θ∗−√ r0410 sin2θ∗cosφ∗−r041−1sin2θ∗cos2φ∗ .(4)Integrating over cosθ∗orφ∗further reduces this distribution to the one dimensional distributionsdσd cosθ∗∝1−r0400+(3r0400−1)cos2θ∗(5)anddσdφ∗∝1−2r041−1cos2φ∗.(6) The spin density matrix elements are defined as bilinear combinations of the helicity amplitudesMλγλV ,whereλγ,λV=−,0,+are the respective helicities of the photon and the vector me-son.For photoproduction,where the photon is quasi-real,the longitudinal photon polarisation component is negligible and only the transverse polarisation states remain.The photon-meson transitions can thus be described in terms of three independent helicity amplitudes M++,M+0,7M +−4,which correspond to no change in helicity (no-flip),a single change in helicity (single-flip)and a double change in helicity (double-flip),respectively.In this case,the matrix elements are related to the helicity amplitudes byr 0400=|M +0|2|M ++|2+|M +0|2+|M +−|2(7)r 0410=12M ++M ∗+0−M +−M ∗+0|M ++|2+|M +0|2+|M +−|2(8)r 041−1=12M ++M ∗+−+M +−M ∗++|M ++|2+|M +0|2+|M +−|2.(9)Under s -channel helicity conservation,only the amplitude M ++is non-zero and consequentlythe r 0400,r 0410and r 041−1matrix elements should all be zero.In contrast,both the BFKL and two-gluon models predict a violation of SCHC.In the case of the LL BFKL model,the helicity amplitudes are predicted to follow a hierarchical structure with |M ++|>|M +−|>|M +0|[9,10].3.3Monte Carlo SimulationA Monte Carlo simulation based on the DIFFVM program [20]is used to describe the diffrac-tive production and decay of ρmesons,and to correct the data for acceptance,efficiency and smearing effects.The Q 2and W dependences of the cross section are taken from previous mea-surements [21].The t dependence is taken according to the power law measured in the present analysis following an iterative procedure.The simulation includes the angular distributionscorresponding to the measurements of the present analysis for the r 0400,r 041−1and the Re [r 0410]matrix elements.The M Y spectrum is parameterised as d σ/d M 2Y ∝f (M 2Y )/M 2.15Y [22],wheref (M 2Y )=1for M 2Y >3.6GeV 2and,at lower masses,is a function which accounts for the production of excited nucleon states.Other angular distributions and correlations are taken in the s -channel helicity conservation approximation.The mass distribution is described by a rel-ativistic Breit-Wigner distribution,the mass and the width of the ρbeing fixed [23],including skewing effects resulting from the interference with open pion pair production [24,25]taken from the current analysis.For studies of systematics uncertainties,all simulation parameters have been varied within errors (see section 3.5).The DIFFVM simulation is also used for the description of the ω,φand ρ′backgrounds (see next section).Here the t distributions are described using the same parameterisation as for the ρmeson and the angular distributions are kept in the SCHC approximation,which is justified by the smallness of these contributions.All generated samples are passed through a detailed simulation of the detector response based on the GEANT3program [26],and through the same reconstruction software as used for the data.Figure 2presents the observed and simulated distributions for several variables of the se-lected sample of events.The simulated distributions,which include the amounts of background 4The three corresponding amplitudes M −−,M −0and M −+are not independent since they satisfy M ++=M −−,M +−=M −+and M +0=−M −0due to parity symmetry.8discussed in section3.4,are normalised to the number of observed events.Reasonable agree-ment is observed for all distributions,showing that the Monte-Carlo simulations can reliably be used to correct the data for acceptance and smearing effects.The structure in theφ∗distribution (Fig.2f)is due to the low geometrical acceptance of the central tracking detector in the case where the angle between theρmeson production and decay planes is small(φ∗∼0◦or180◦), which leads to the emission of one of the pions at a small angle relative to the beam direction.3.4BackgroundsDiffractive photoproduction ofω,φandρ′mesons5can fakeρproduction through the decay channels:ω→π+π−π0,φ→π+π−π0,φ→K0S K0L,ρ′→ρ±π∓π0,ρ±→π±π0,(10) if the decay photons of theπ0or the K0L mesons are not detected6.This happens in the cases where the energy of the neutral particle is deposited in an inactive region of the detector,is associated to the charged pion tracks,or is below the noise threshold.Diffractive photoproduc-tion ofωandφmesons also gives the same topology as that of theρmeson within the detector through the decay channelsω→π+π−,φ→K+K−.(11)To estimate the corresponding backgrounds,theω,φandρ′cross sections were taken from measured ratios to theρcross section in the Q2range relevant for the analysis:σω/σρ=0.106±0.019[27],σφ/σρ=0.156+0.029−0.019[3]andσ(ρ′→ρ±π∓π0)/σρ=0.2±0.1.In thelatter case,the ratio is obtained from the ratioσ(ρ′→ρ0π+π−)/σρ=0.10±0.05,measured in electron[28]and muon[29]scattering off a liquid hydrogen target,under the assumptionσ(ρ′→ρ+π−π0)+σ(ρ′→ρ−π+π0)σ(ρ′→ρ0π+π−)=2.(12)The background contributions in the selected kinematic domain(2)and for the selectedρmass range are estimated and subtracted separately for each measurement interval using the Monte Carlo simulations.In total,the backgrounds amount to0.5%,0.2%and1.2%forω,φandρ′production,respectively.5The detailed structure[23]of theρ′state is not relevant for the present study.The nameρ′is,therefore,used to represent both theρ′(1450)and theρ′(1700).In the DIFFVM simulation,theρ′mass and width are taken as 1450MeV and300MeV,respectively.6The contribution from background processes leading to more than two charged particles in thefinal state is negligible.93.5Systematic UncertaintiesThe systematic uncertainties on the measurements are estimated by varying the event selection, the parameters of theρMonte Carlo simulation and the properties of subtracted backgrounds. The following sources of systematic error are taken into account:•Uncertainties in theρsimulationThe uncertainty on the input t distribution,used to compute acceptances and smearing ef-fects and to adjust the measurements to the mean t value for each t interval,is taken into account by varying the exponent of the Monte Carlo power law by±0.5.The uncertainty in the modelling of the dissociative proton system Y is estimated by reweighting the pro-ton remnant mass distribution by factors(1/M2Y)±0.3[22].For the angular distributions, the spin density matrix elements are varied around the values measured in the current data according to the spread of the observed results with t by±0.03for r0400,±0.02forRe[r0410]and+0.02−0.04for r041−1.Finally,in the low|t|region where non-zero skewing is ob-served in theρline shape,the skewing parameter is varied according to the uncertainty of thefit to the invariant mass distribution(see section4).•Uncertainties on the background distributionsThe amount of background is varied by changing the ratio of the background cross sec-tions to theρcross section according to their uncertainties,as quoted in section3.4.The t dependence of theρ′distribution,which provides the largest background contribution, is further varied using weighting factors of(1/|t|)±2.0.•Uncertainties in the detector descriptionUncertainties on the detailed p t and angular dependences of the trigger efficiencies are taken into account by varying them within their estimated errors.The uncertainty on the tracking acceptance at large angles is estimated by varying the cut on the polar angle of the reconstructed tracks between150◦and160◦.The threshold for the detection of energy deposits in the LAr that are not associated to the two pion candidates is varied between 300MeV and500MeV.Finally,the influence of the uncertainty in the description of the electron tagger acceptance is estimated by shifting the acceptance range in W by3%.For the measurement of the t dependence,the largest sources of systematic uncertainty are the slope of the t distribution in the MC,the variation of the LAr energy threshold and the variation of the upperθcut.Additionally,for the measurement of the spin density matrix elements, the parameterisation of the matrix elements in the MC provides a significant effect.For each contribution,the relative effect on the extracted t slope is less than±1%,and the effect on the measured spin density matrix elements is less than±0.015.The total systematic error on the cross section is obtained by adding the individual contribu-tions,which are considered as uncorrelated,in quadrature.Correlated systematics which affect only the normalisation cancel since only normalised cross sections are presented here.For the extraction of the t slope and the spin density matrix elements,the systematic error is obtained by repeating the appropriatefit after shifting the data points according to each individual sys-tematic uncertainty.Again,the individual contributions are added in quadrature.10。

a r X i v :h e p -e x /0510064v 2 1 D e c 2006Study of K −→π0e −νγdecay at ISTRA+setup are presented.4476events of this decay have been observed.The branching ratio (R)is found to be R =Br (K −→π0e −Br (K −→π0e −νe γ)νe )=(0.47±0.02(stat )±0.03(syst ))·10−2.For the cuts E ∗(γ)>30MeV and θ∗eγ>20◦,used in most theoretical papers Br =(3.06±0.09±0.14)·10−4.For the asymmetry A ξ(for the same cuts as in Table.2)we get A ξ=−0.015±0.021.At present time it is the best estimate of this asymmetry.%newpage1IntroductionThe decay K −→π0e −νγdecay amplitudes are calculated at order ChPTO (p 4)in [1],and branching ratios are evaluated in [3].Recently next-to-leading O (p 6)corrections were calculated for the corresponding neutral kaon decay [4].The matrix element for K −→π0e√u (p ν)γν(1−γ5)v (p l )(1)+F νu (p ν)γν(1−γ5)(m l −p l −q )γµv (p l )≡ǫµA µ.First term of the matrix element describes Bremsstrahlung of kaon and direct emis-sion(Fig.1a).The lepton Bremsstrahlung is presented by second term in r.h.s.of Eq(1)and (Fig.1b).The K−→π0eνγdecay defined as1ξπeγ=(3)N++N−Where N+and N−are number of events withξ>0andξ<0T-odd correlation vanishes at tree level of SM[10],but the SUSY theory gives rise to CP-odd(T-odd)observables already at tree level[11,12,13].T-odd asymmetry value for SU(2)L×SU(2)R×U(1)model and scalar models was estimated in Ref[14].In this letter we presentfirst results of the analysis of the K−→π0eThe decay products are deflected by the spectrometer magnet M2with thefield in-tegral of1Tm.The track measurement is performed by1-mm-step proportional cham-bers(P C1÷P C3),2-cm-cell drift chambers(DC1÷DC3),and by four planes of the 2-cm-diameter drift tubes DT.The photons are measured by lead-glass electromagneticcalorimeter SP1which consists of576counters.The counter transverse size is5.2×5.2cmand length is about15X0.To veto low energy photons the decay volume is surroundedby eight lead-glass rings.Lead-glass electromagnetic calorimeter SP2is also used as apart of the veto system.3Event selectionDuring physics run in November-December2001350M events were logged on tapes.Thisinformation is complemented by260M events generated with Geant3[16].The MonteCarlo simulation includes a realistic description of the experimental setup:the decay volume entrance windows,the track chamber windows,gas mixtures,sense wires and cathode structures,Cherenkov counters mirrors and gas mixtures,the showers develop-ment in the electromagnetic calorimeters,etc.The detailed discussion of the simulation and reconstruction procedure is given in our previous publications[17,18].Events with one negative track detected in tracking system and four showers detectedin electoromagnetic calorimeter SP1are selected as candidates for K−→π0eνγdecay. One of this showers must be associated with the charged track.Events with vertex inside interval400<z<1650cm,and transverse radius less than10cm is selected for further analysis.The probability of the vertexfit,CL(χ2),is required to be more than10−4.Absenceof signals in veto system above noise threshold is required.The electron identification is done using E/P ratio of the energy of the cluster asso-ciated with the track to momentum of this track given by tracking system.This ratio must be inside interval0.80-1.15(see Fig.3).Another cut used for the suppression of the π−contamination is that on the distance between the charged track extrapolation to the front plane of the electoromagnetic detector and the nearest shower.This distance must be less than2,5cm.The effective mass m(γγ)within±30MeV fromπ0table mass(Fig.4)is required.At the end,the convergence of the2C K−→π0e−νeγare:(1)K−→π−π0π0where one of theπ0photons is not detected andπ−decays to eνor is misidentified as an electron.Figure2:The side view of the ISTRA+detector05001000150020002500300035004000450000.20.40.60.811.2 1.4 1.6 1.82E/p ratioe n t r i e s p e r 0.02cut cutFigure 3:E/P ratio for the real data.Dot-ted line is our fit of background.1000200030004000500000.050.10.150.20.25m γγe n t r i e s p e r 0.001cut cutFigure 4:γγmass for the real data.(2)K −→π−π0with “fake photon”and π−decayed or misidentified as electron.Fake photon clusters can come from π-hadron interaction in the detector,external bremsstrahlung upstream of the magnet,accidentals.All these sources are included in our MC calcula-tions.(3)K −→π0eνwith extra photon.The main source of extra photons is an electron interactions in the detector.(4)K −→π−π0γwhen π−decays or is mis-identified as an electron.(5)K −→π0π0eνwhen one γis lostFrom Fig.3it is seen that in raw data background contamination from channels with charged pion in final state is about 15%.Requirement on the missing energy in the decay reduces mainly background chan-nel(4).Cut1:E miss >0.5GeVFor the suppression of the background channels (1-5)we use a cut on the missing mass squaredM 2(π0eγ)=(P K −P π0−P e −P γ)2.For the signal events this variable corresponds to the square of the neutrino mass and must be zero within measurement accuracy (see Fig.5).Cut2:−0.01<M 2(π0e −γ)<0.01For the suppression of the background channel(1)we also use a cut on the missing mass squared M 2(π−π0)=(P K −P π−−P π0)2For the background(1)events this variable corresponds to π0mass,for the signal events distribution of this variable is rather wide (see Fig.6).Cut3:The events with 0.009<M 2(π−π0)<0.024are cutted out.The dominant background to K e 3γarises from K e 3with extra photon.The back-ground (3)is suppressed by requirement on the angle between electron and photon in the laboratory frame θeγ(see Fig.7)The distribution of the K e 3-background events has5001000150020002500-0.05-0.04-0.03-0.02-0.0100.010.020.030.040.05M 2(πe γ) GeV 2e n t r i e s p e r 0.001cut cuta)20406080100-0.05-0.04-0.03-0.02-0.0100.010.020.030.040.05M 2(πe γ) GeV2e n t r i e s p e r 0.005cut cutb)Figure 5:Missing mass M 2(π0e −γ)distribution;a)for the real data b)for the backgroundchannel(1).50010001500200025003000-0.1-0.08-0.06-0.04-0.0200.020.040.060.080.1M 2(π-π0) GeV 2e n t r i e s p e r 0.001cutcuta)50100150200250300-0.1-0.08-0.06-0.04-0.0200.020.040.060.080.1M 2(π-π0) GeV2e n t r i e s p e r 0.001cut cutb)Figure 6:missing mass distribution M 2(π−π0)a)for real data;b)for the background (1)10310400.0050.010.0150.020.0250.03θe γe n t r i e s p e r 0.0005a)cut 101010θe γe n t r i e s p e r 0.0005Figure 7:Distribution over θeγ-the angle between electron and photon in lab.system.a)real data;b)MC background (histogram)and signal(points with errors)CutbackgroundNumber of events selected329013742810035−0.01<M 2(π0e −γ)<0.01252872329371530.002<θeγ<0.0301603R exp×102experiment14568219213νeγ)/Br(K−→π0e−50100150200250300350400E *γ, GeVe n t r i e s p e r 0.05Figure 9:The distribution of the events over E ∗γ-the energy of the photon in the kaon rest frame.Histogram corresponds to the data,points with errors-total signal plus background MC.To obtain the branching ratio of the K π0e −νe γ)νe )=(1.81±0.03(stat )±0.07(syst ))·10−2(4)for E ∗γ>10MeV and θ∗eγ>10◦.Systematic errors are estimated by variation of the cuts of Table 1.For comparison with previous experiment the branching ratio with cuts E ∗γ>10MeV,0.6<cosθ∗eγ<0.9is calculatedR =Br (K −→π0e −Br (K −→π0e −νe γ)νe )=(0.64±0.02(stat )±0.03(syst ))·10−2.(6)Using PDG value for K e 3decay branching for K −→π0e −νe γ)|<0.8·10−4in the SU (2)L ×SU (2)R ×U (1)model[14]and A ξ=−0.59·10−4in the Standard Model[10]The authors would like to thank D.S.Gorbunov,V.A.Matveev and V.A.Rubakov,for numerous discussions.V.V.Braguta,A.A.Likhoded,A.E.Chalov for program of matrix element calculation.The work is supported in part by the RFBR grants N03-02-16330 (IHEP group)and N03-02-16135(INR group)and by Russian Science 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University of Hamburg, Institute of Mineralogy and PetrologyRaman and IR spectroscopy in materials science.Symmetry analysis of normal phonon modesBoriana MihailovaOutline1. The dynamics of atoms in crystals. Phonons2. Raman and IR spectroscopy :most commonly used methods to study atomic dynamics3. Group theory analysis :phonon modes allowed to be observed in IR and Raman spectra6, hexagonalKLiSO4a mode involving SO4translations and Li motions vs K atomscrystals :Harmonic oscillatorψψ2diatomic chainq) q)qachain in 1Dqachain in 3Delectromagnetic waveanti-Stokes Stokesdifferent interaction phenomena different selection rules !IR activityIsolated TOThree techniques of selection rule determination at the Brillouinor input, then clickCa: (6b) 0 0 0C : (6a) 0 0 0.25 O : (18e) 0.25682 0 0.25Calcitenumber of operation of each classPoint group normal modessymmetry operationscharactersselection rulesIR-activeμz≠0μx, μy≠0rotation (inactive)Ca: (6b) :C : (6a) :O : (18a) :A1u+ A2u+ 2E uA2g+ A2u+ E g+ E uA1g+ A1u+ 2A2g+ 2A2u+ 3E g+ 3E u+ acoustic(N= 6:3 +6:3+18:3 = 10) Total: 10A + 10E = 30 3N= 30Γopt= A1g(R) + 2A1u(ina) + 3A2g(ina) + 3A2u(IR)+ 4E g(R) + 5E u(IR) 5 Raman peaks and 8 IR peaks are expected(xz,yz)Raman-activeαxx= -αyy≠αxynon-zero componentsαxz≠αyzαxx= αyy≠αzzacoustic: A2u+E u(the heaviest atom)4 5213Solution:chemical B-site disorderBOstretching6A 1gE gxy T 2g T 2g T 1uInfrared transmissioncubicnon-cubicLO-TO splitting: sensitive to local polarization fields induced by point defectsBi12SiO20:XRaman shift / cm-10.0940.4760.899×1018cm-3undoped Raman shift / cm-1different types of atoms in the same crystallogr. position,mf =ωT > T CGroup theory:predicts the number of expected IR and Raman peaksone needs to know: crystal space symmetry + occupied Wyckoff positions Deviations from the predictions of the group -theory analysis:•☺LO-TO splitting if no centre of inversion (info included in the tables)•☺one-mode –two-mode behaviour in solid solutions•☺☺☺local structural distortions (length scale ~ 2-3 nm, time scale ~ 10-12s)• Experimental difficulties (low-intensity peaks, hardly resolved peaks)ConclusionsWhat should we do before performing a Raman or IR experiment?。

Photoinduced Electron TransferReactions: A Fascinating World of PhotophysicsIn everyday life, we often encounter a variety of chemical reactions from simple combustion to complex metabolic processes. However, some of the most interesting reactions that take place in nature are the photoinduced electron transfer (PET) reactions. PET reactions have been the subject of research for many years, and they continue to intrigue chemists, physicists, and biologist alike. In this article, we delve deeper into this fascinating world of photophysics.What are PET Reactions?In essence, photoinduced electron transfer reactions are a type of chemical reaction where an electron is transferred from one molecule to another upon absorption of light. In other words, PET reactions involve the transfer of an electron from an excited state to a ground state molecule. These types of reactions are widely prevalent in nature and are involved in several critical biological processes, including photosynthesis and cellular respiration.How Do PET Reactions Work?The process of a PET reaction can be thought of as a two-step process. In the first step, a photon is absorbed by a molecule, which excites it to a higher energy state. This step is known as photoexcitation. In the second step, the excited molecule interacts with another molecule, which accepts the excited-state electron. This step is known as electron transfer. The end result of a PET reaction is the creation of two new molecules, one of which has an extra electron that it did not possess before the reaction took place.Key Features of PET ReactionsPET reactions are essential for a wide range of biological and chemical processes. Some of the notable features of these reactions include:1. Efficient Energy Transfer: PET is an efficient way to transfer energy between molecules. By transferring energy via electron transfer, the energy is transferred with almost 100% efficiency.2. Selectivity: PET reactions can occur selectively between specific pairs of molecules. This selectivity makes them useful tools for chemical synthesis.3. Sensitivity to Environment: The rate and efficiency of a PET reaction can be influenced by the environment in which the reaction occurs, including temperature, solvent, and concentrations of the reactants.Applications ofPET reactions have broad applications in chemical, biological, and environmental sciences. Here are some of the important applications of PET reactions:1. Solar Energy Conversion: PET reactions play a crucial role in solar energy conversion. In photovoltaic devices, PET reactions are utilized to convert light energy into electrical energy.2. Sensing: PET reactions can be used to sense various biological molecules and environmental pollutants. For example, PET-based sensors are used to detect glucose levels in diabetic patients.3. Chemical Synthesis: PET reactions provide an efficient way to synthesize complex organic molecules. The selectivity and sensitivity of these reactions make them useful in developing new drugs, materials, and catalysts.Future of PET ReactionsPET reactions continue to be a subject of intense research in several scientific fields. Advances in experimental and computational techniques have shed more light on the fundamental mechanisms of these reactions. In the future, the use of photoinducedelectron transfer reactions is expected to expand further into new areas of application, including optoelectronics and nanotechnology.ConclusionIn conclusion, photoinduced electron transfer reactions represent a fascinating world of photophysics. These reactions play a crucial role in several natural processes, ranging from photosynthesis to cellular respiration. Furthermore, they have broad applications in various scientific fields, including solar energy conversion, sensing, and chemical synthesis. With their selectivity, efficiency, and sensitivity to the environment, PET reactions are poised to play an ever-more significant role in future scientific research and technology.。

论文题目（英文题目要译成中文）期刊名倾斜极化磁多层膜的铁磁共振理论Phys. Rev. B Rapid response mechanism of pi cell（Pi 盒的快速响应机制）Appl. Phys. Lett.Response times in Pi-cell liquidcrystal displaysLiq. Cryst.弱锚定垂面排列液晶显示器的响应时间液晶与显示栅状表面液晶盒的光学属性计算物理中文图形12864点阵液晶显示模块与51单片机的并行接口电路及C51程序设计现代显示Monte Carlo 模拟空间各向异性势向列相液晶微滴计算物理基于修正Gruhn-Hess 两体势模型的内禀锚定研究Physics letters. A基于分级模型的钾离子通道选择性通透机制的研究IEEE 会议论文考虑视轴方向的个性化眼模型的构建光学学报基于个性化模型的人眼色差对视功能影响的研究光子学报The study of wavelength-dependentwavefront aberrations based onindividual eye model （基于个性化眼模型的人眼波像差随波长变化的研究）Optik 基于个体眼光学结构的角膜与晶状体的像差补偿研究光学学报The lower-valence coexistingferrimagnetic Cr2VX (X=Ga, Si, Ge,Sb) Heusler compounds: A first-principles study低价共存的赫斯勒合金Cr2VX(X=Ga, Si, Ge, Sb)的第一性原理研究Ab initio investigation of half-metalstate in 钾通道的结构：钾离子传导和选择性的分子基础《科学》杂志精选论文基于离子通道选择性的水合碱金属阳离子结构的研究中国物理快报Physica BScripta Materialiazinc-blende MnSn and MnC闪锌矿结构的MnSn和MnC的半金属态的从头计算研究用临界点附近的涨落讨论Landau相变理论的适用范围河北工业大学学报“建设国家级实验教学示范中心的探索与实践”《全国高等学校物理基础课程教育学术研讨会论文集》坚持创新教育实验教学理念建设物理实验教学示范中心《第五届全国高等学校物理实验教学研讨会论文集》创建国家级实验教学示范中心及其辐射示范作用的研究与实践《实验技术与管理》大学生自主创新教育应适应社会需求性与尊重学生选择性《第五届全国高等学校物理实验教学研讨会论文集》坚持创新教育实验教学理念建设物理实验教学示范中心《物理实验》（特刊）《关于如何提高基础物理实验课质量的探讨》《科学时代》带电粒子致细胞失活的理论模型中国原子能科学研究院年报2007Two-photon spectroscopic behaviorsand photodynamic effect on the BEL-7402 cancer cells of the newchlorophyll photosensitizer《中国科学》（一种新型叶绿素光敏剂的双光子光谱特性B 辑及其对BEL-7402肝癌细胞的双光子光动力效应）（英文版）Tunneling effect of two horizons froma Gibbons-Maeda black holeChinese Physics LettersTunneling Effect from a Non-static Black Hole with the Internal GlobalMonopole International Journal of TheoreticalPhysicsTunneling effect of two horizons from a Reissner-Nordstrom black hole International Journal of TheoreticalPhysics用新乌龟坐标计算任意直线加速带电黑洞的熵北京师范大学学报自然科学版液晶与显示Physica BTheoretical Models of Cell Inactivation by Ionizing Particles（带电粒子致细胞失活的理论模型）Annual Report of China Institute of Atomic Energy 2007片剂硬度测试仪的液晶显示界面设计克尔黑洞的内视界隧道效应北京师范大学学报自然科学版Order Parameter of theAntiferroelectric Phase Transition ofLead Zirconate,Ferroelectric LettersSymmetry of the AntiferroelectricLead ZirconateFerroelectric LettersInvestigation of Ferroelectric PhaseTransition of Rochelle SaltFerroelectrics 锆酸铅的反铁电相对称性研究人工晶体学报方硼盐本征铁电相变的研究河北工业大学学报The synchronization ofFitzHugh--Nagumo neuronnetwork coupled by gapjunctionChinese Physics BStudy of intrinsic anchoring in nematicliquid crystals based on modifiedGruhn-hess pair potential（基于修正的Gruhn-hess两体势研究向列相液晶的内禀锚定）Phys. Lett. AThe Electrod Effect in LCD Cell（LCD盒中的电极效应）电子器件聚合物稳定向列相液晶显示的上升时间常数现代显示全Heusler 合金Cr2MnAl的第一性原理研究Appl. Phys. Lett.大范围Mn掺杂Heusler-型 Cr3Al的半金属化合物的理论设计J. Appl. Phys.局域键近似下的固体材料热驱动下的弹性软化J. Phys. D: Appl. Phys. Heusler 相 Co2YBi 和半-Heusler 相CoYBi (Y=Mn, Cr)的带结构计算J. Magn. Magn. Mater含时外势作用下玻色-爱因斯坦凝聚的非自治孤子自旋极化电流导致的铁磁金属多层膜中的铁磁共振J. Appl. Phys.“液晶显示器件物理专业方向”的实验设置实验技术与管理混合排列向列相边缘场效应电光特性的模拟计算现代显示Opt. 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Phys.液晶全漏导模透射率的实验研究大学物理实验离子与通道相互作用对NaK 通道通透特性影响的研究物理学报Extracelluar Potassium ions Play Important Roles in the Selectivity of Mutant KcsA Channel 2011 4th International Conference on Biomedical Enginerrint andInformaticsThe Difference Analysis of Nonlinear Absorption Coefficient β in the Beam Sections of Plain and Gaussian Distribution Nonlinear AbsorptionCoefficient βin the Beam Sections of Plain andGaussian DistributionEffects of Magnetic Fields on the Synchronization of Calcium Oscillations in Coupled Cells Journal of Computational and Theoretical NanoscienceOptimal design of hollow elliptical waveguide for THz radiationJournal of Physics: Conference Series，2011,Volume:276，No.1012229Approach dealing with the pulse profile of pump laser in Z-scantechniqueJournal of Physics: Conference Series，2011,Volume:276，No.1012229Propagation characteristics of THz radiation in hollow rectangle metalwaveguideJournal of Physics: Conference Series，2011,Volume:276，No.1012229ProcSPIE,作者（名次）时间李再东2008孙玉宝，马红梅，张志东3月孙玉宝（2）7月马红梅，王娜红，孙玉宝2月叶文江2008.9李志广2008.7第1张艳君2008.52张艳君2008安海龙(2)May-08刘铭1Feb-08刘铭1Aug-08刘铭1Jun-08刘铭1Aug-08安海龙(1)李佳120082008-3-1安海龙(1)Nov-08李佳12008王双进（第一作者）2008.1魏怀鹏（排名1）、李再东、安莉、张志东、展永，2008.7魏怀鹏（排名1）、张志东、展永2008.1魏怀鹏（排名1）、张志东、展永2008.11，温春东，魏怀鹏（排名2），段雪松，孔祥明，丁军锋，甄芳芳2008.1魏怀鹏（排名1）、张志东、展永2008.11魏怀鹏第一作者2008.4曹 天光1Jun-08ZHAO PeiDe et al第一作者（论文通讯联系人）任军12008.5任军12008.3任军1Jul-08任军12008年2月淮俊霞（第一作者）李佳120082008.6曹 天光1Jun-08Jun-08任军12008年10月周国香12008周国香12008周国香12008周国香12008周国香12008展永12008张志东，张艳君2008.1张志东，赵金良2008.1刘丽媛（学生），刘艳玲（学生），张志东2008.9盖翠丽甄晓玲王纪刚张志东李佳（1）2009李佳（1）2009李佳（1）2009李佳（1）2009李再东第二(通信作者)李再东第二2009张志东，范志新20092008.72008.6李再东第三(通信作者)刘铭（1）2009.03柳辉（1）2009.3柳辉（2）2009.7.Liu Hui (4)2009.7Liu Hui (4)2009.6Liu Hui (8)2009.8刘铭（5）2009任军（第一作者）2009年8月2009.03Liu Hui (1)2009.1任军（第一作者）2009年2月任军（第一作者）2009年7月马红梅，孙玉宝9月叶文江12009.1叶文江12009.1叶文江22009.8叶文江12009.3叶文江22009.11张勇（2）2009.03张玉红（第一）2009叶文江2任军（第一作者）Dec-092009.12张勇（1）2009.032009.03张勇（2）张玉红（第二）2009赵培德第一作者2010通讯联系人第一期赵培德第七2009赵培德第一作者通讯联系人赵培德第二作者通讯联系人周国香第二2009，1周国香第二2009，10周国香第二2009，6周国香第三2009，7周国香第三2009，8任军(1)2010年3月任军(1)2010年4月20092009周国香第三2009，5任军(1)2010年9月李再东,李秋艳，贺鹏斌，梁九卿，刘伍明，傅广生2010李秋艳，李再东，李录，傅广生2010李秋艳，李再东(*)，姚淑芳，李录，傅广生2010李秋艳，李再东，贺鹏斌，宋伟为，傅广生。