Charm particle production in hadronic collisions

some of the Linac bunches to make the beam fit into the PS Booster RF buckets • Four types of accelerating structures:
• Radio Frequency Quadrupole (RFQ) • Drift tube Linac (DTL) • Cell-Coupled Drift Tube Linanc (CCDTL) • Side Coupled Linac (SCL) • Pulse rate 1.2 s
• Secondary particle beams: • From 1 GeV to ~ 15 GeV with ~ 106 particles • Protons, Electrons, Muons, Pions
Contents
• Why Accelerators and Colliders ? • The CERN Accelerator Complex • Cycling the Accelerators & Satisfying
Users • The Main Ingredients of an Accelerator • A brief word on the Future
is used to produce secondary particles
All energy will be available for particle production
Basics of Accelerator Physics and
Rende Steerenberg, BE-OP
Technology
Basics of Accelerator Physics and

a r X i v :0710.3323v 1 [n u c l -t h ] 17 O c t 2007D andD mesons are studied in hot dense matter within a self-consistent coupled-channel approach taking,as bare interaction,a broken SU(4)s -wave Tomozawa-Weinberg interaction supplemented by an attrac-tive isoscalar-scalar term.The in-medium solution at finite temperature incorporates Pauli blocking effects,baryon mean-field bindings,and πand open-charm meson self-energies.In the DN sector,the Λc and Σc resonances remain close to their free-space position while acquiring a remarkable width.As a result,the D meson spectral density shows a single pronounced peak close to the free mass that broadens with increasing density specially to-wards lower energies.The low-density theorem is not a good approximation for the repulsiveD )and hidden (e.g.J/Ψ)charmed mesonsin a hot and dense baryonic environment.The in-medium modification of the D (D )in the nuclear medium [2].However,a coupled-channel meson-baryon scattering in nuclear medium is needed due to the strong coupling among the DN and other meson-baryon channels [3–6].In the present article,we pursue a coupled-channel study on the spectral properties of D and1tolos@fias.uni-frankfurt.de1L.Tol´o s et al.D andI m T (ρ0)[M e V -1]P 0[MeV]I m T (ρ0)[M e V -1]P 0[MeV]q 0[MeV]S D (q 0,q =0,ρ0)[G e V -2]q 0[MeV]Figure 1:Λc and Σc resonances,and the D meson spectral functionorder to examine the possible implications in the J/Ψsuppresion at FAIR.The D andL.Tol´o s et al.D andρ/ρ0R e U D - (q =0) [M e V ]R e U (q =0)[M e V ]-T[MeV]I m U (q =0)[M e V ]T[MeV]Figure 2:D potentials.surface with temperature.Both resonances move up in energy closer to their free position while they are smoothen out,as in [5].In the r.h.s of Fig.1we display the D meson spectral function for (i)to (iii)(thick lines)for model A and case (iii)for model B (thin line).At T =0the spectral function presents two peaks:˜Λc N −1excitation at a lower energy whereas the second one at higher energy is the quasi(D)-particle peak mixedwith the ˜Σc N −1state.Once MFB is included,the lower peak built up by the ˜Λc N −1mode goes up by about 50MeV relative to (i)since the meson requires to carry more energy to compensate for the attraction felt by thenucleon.The same characteristic feature is seen for the ˜Σc N −1configuration that mixes with the quasiparticle peak.The PD does not alter much theposition of ˜Λc N −1excitation or the quasiparticle peak.For model B ((iii)only),the absence of the ΣDN term moves the ˜Λc N −1excitation closer to the quasiparticle peak,while the latter fully mixes with the ˜Σc N −1excitation.When finite temperature effects are included,those structures get diluted with increasing temperature while the quasiparticle peak gets closer to its free value and it becomes narrower,because the self-energy receives contributions from higher momentum DN pairs where the interaction is weaker.In theDN interaction.Our results are,however,consistent with a recentcalculation [8].For model A,we obtain a non-zero value of the I =0scat-tering length,due to the magnitude of the ΣDN term.As seen in the l.h.s of3L.Tol´o s et al.D andFig.2,theD optical potentials. For model A(B)at T=0,we obtain an attractive potential of−12(−18) MeV for D meson while the repulsion forD optical potential is very weak,while the imaginary part increases steadily due to the increase of collisional width. The picture is somewhat different for the D meson due to the overlap of the quasiparticle peak with the˜Σc N−1mode.The˜Σc N−1mode also alters the effect of theΣDN term on the potential.With regard to the J/Ψsuppression,the in-medium。

强激光与粒子束英文版英文回答：High-power lasers and particle beams are two powerful tools that have found a wide range of applications in scientific research, industry, and medicine. Lasers are devices that emit a highly focused beam of light, while particle beams are streams of charged particles, such as electrons or protons.Both lasers and particle beams can be used to heat, cut, and vaporize materials. They can also be used to modify the surface properties of materials, such as their roughnessand wettability.Lasers are often used in manufacturing processes, such as cutting, welding, and engraving. They can also be usedin medical procedures, such as laser surgery and laser skin resurfacing.Particle beams are often used in research applications, such as particle physics and nuclear physics. They can also be used in medical applications, such as radiation therapy for cancer.The choice of which tool to use for a particular application depends on a number of factors, including the desired precision, power, and cost.中文回答：强激光与粒子束。

Nucl-th/0309033, Phys. Lett.B 585, 85 (2004)
Modified QHD? Nuclear matter: effective theory? Refinement of microscopic description for nuclear
matter theory with in-medium meson (Selfconsistency?)
Hiden symmetry and strongly interacting fermions correlations at Finite T and ρN
Ji-sheng Chen Central China Normal Univ.
Wuhan 430079
Chenjs@
2020/8/8
Addressing
1. EOS of hot/dense nuclear matter 2. Relation between mN*, mσ* , m*, m* etc.
improved 3. Superfluidity with relativistic nuclear theory
2020/8/8
Phase diagram of strongly interacting matter
Superfluidity as well as BEC
Superconducti vity
CERN-SPS, RHIC, LHC: high temperature, low baryon density
2020/8/8
1. Introduction
1. Heavy ion collisions
• High T/ρ Physics QGP-deconfinement Chiral symmetry (partial) restoration phase transition • Medium effects?