Korea-EU Alice 2004 Su Houng Lee Hungchong Kim, Taesoo Song, Yongjae Park, Yongshin Kwon (Osaka), Youngsoo Son, Kyungchul Han, Kyungil Kim Nuclear and.

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Presentation transcript:

Korea-EU Alice 2004 Su Houng Lee Hungchong Kim, Taesoo Song, Yongjae Park, Yongshin Kwon (Osaka), Youngsoo Son, Kyungchul Han, Kyungil Kim Nuclear and Hadron Physics group at Yonsei University and our physics interests

Korea-EU Alice 2004 Research Interests Research TopicsCollaborators Light vector mesons in mediumT. Hatsuda (92-95) B. Friman, H. Kim(97-) Form FactorsY. Oh, T. Song, T. Barnes, C.Y.Wong PentaquarksY.Oh, H. Kim, A. Hosaka, Y. Kwon Charmonim in medium and future GSI project W. Weise(99), C.M. Ko(02) S.H.Lee (03) QCD properties above T c and charmonium states in QGP T.H. Hansson, I. Zahed (88) S.H. Lee(89), T. Song, C. Y. Wong (04)

Korea-EU Alice 2004 Some Historical Perspective on Strong coupling QCD above T c Manousakis, Polonyi, PRL 58 (87) 847 “Nonperturbative length scale in high T QCD” Space-Time Wilson Loop Area Law of Space-Space Wilson Loop Time Space Separation Potential Dynamical confinement

Korea-EU Alice 2004 Charmonium states in QGP I Hansson, Lee, Zahed, PRD 37 (88) 2672 “Charmonium states in QGP” Due to non-perturbative nature of QGP, Charmonium states might survive at QGP. How big is the dissociation due to gluons? We concluded that the Charmonium dissociation cross section by gluons is not large and charmonium, if bound, will survies above T c Thermal decay width of charmonium due to thermal gluons  is binding energy

Korea-EU Alice 2004 Charmonium states in QGP II Asakawa, Hatsuda, PRL 92 (04) Qunched lattice QCD calculation shows Charmonium states survies up to 1.6 T c Due to Deby screened potential with large coupling constant. (Brown, Rho, C.H.Lee, Shuryak, Zahed, C.Y. Wong)

Korea-EU Alice 2004 Charmonium states in QGP III Lee, Song, Wong in preparation Developed a formalism based on Bethe- Salpeter amplidude to handle such bound states at high Temperature Dissociation of Charmonium due to thermal light quarks are small

Korea-EU Alice 2004 Charmonium states in QGP IV Hence, in relation to charmonium suppression in RHIC, More detailed theoretical and experimental analysis is needed in RHIC and LHC (Alice), where a more thermalized QGP is expected. Theoretically relevant questions Dissociation cross sections by partons vs. hadrons Realistic production Rate calculations. QGP vs. Hadron gas. and so on

Korea-EU Alice 2004 Some perspective on Wilson Loops and QCD Vacuum Shifman, NPB 173 (80) 13 Area law of Wilson loops and gluon condensates ” Space-Time Wilson Loop Space-Space Wilson Loop Time Space Area law of Wilson loops

Korea-EU Alice 2004 Nonperturbative Length scale and Gluon condensate above T c S H Lee, PRD 40 (89) 2484 (later confirmed by Hatsuda, Koch, Brown ) Gluon condensate changes to half of its vacuum value above T c Reflects the QCD vacuum change near the phase transition.

Korea-EU Alice 2004 Effects in Nuclear matter

Korea-EU Alice 2004 On the other hand, heavy nuclei provide a constant density where QCD vacuum changes At nuclear matter density

Korea-EU Alice 2004 Vacuum change inside nucleiQCD Vacuum Change in external field

Korea-EU Alice 2004 is Heavy quark propagator is sensitive to only gluon fields and therefore the mass of heavy quark system will change in nuclear medium

Korea-EU Alice 2004 Just like Hydrogen Atom in external E&M field or in this case, dominantly 2 nd order Stark Effect

Korea-EU Alice 2004 Approaches for charmonium mass shift in nuclear matter: Quantum numbers QCD 2 nd Stark eff. Potential model QCD sum rules Effects of DD loop cc 0 -+ – 8 MeV – 5 MeV (Klingl, SHL,Weise) No effect (SHL, Ko) J/  1 -- – 8 MeV (Peskin, Luke) -10 MeV (Brodsky et al). – 7 MeV (Klingl, SHL,Weise) <2 MeV (SHL, Ko)   0,1, MeV (SHL) -60 MeV (SHL) No effect on    MeV (SHL) < 30 MeV (SHL, Ko)  MeV (SHL) < 30 MeV (SHL, Ko)

Korea-EU Alice 2004 Can we observe this? Anti-Proton Nucleus Incoming energy W (for all charmonium ) X (for all vector state) e + e - invariant mass M (for all  states ) or J/  -  invariant mass

Korea-EU Alice 2004 First method has been used at Fermilab E835

Korea-EU Alice 2004 Expected shifts from a nuclear target including Fermi momentum of the nucleons

Korea-EU Alice 2004 Will Charmonium be formed inside the nucleus? 1. Kinematics cc J/     3.7 GeV/c GeV c

Korea-EU Alice 2004 Will charmonium be formed inside the nucleus? 1. For anti proton momentum between 3- 6 GeV/c, the inelastic cross section on a proton is 50 mb=5 fm 2

Korea-EU Alice 2004 Anti proton Heavy nuclei Anti proton project at GSI Anti proton will be absorbed at surface and Charmonium will decay inside the heavy nuclei

Korea-EU Alice 2004 Expected shifts in the invariant mass spectrum from a nuclear target including collision broadening Typical collision broadening

Korea-EU Alice 2004 Production rate: J PC Mass shiftFinal state  to final state Events per day J/  1 -- – 8 MeVe + + e - 6 pb100  1 -- – 100 MeVe + + e pb10  MeVe + + e - 1 pb17  MeV J/  +  200 pb3400  MeV J/  +  80 pb1360   MeV J/  +  350 pb5950

Korea-EU Alice 2004 Such experiment can be done at 1. GSI future accelerator facility ⇒ anti proton project (1-15 GeV) SIS100/200 HESR

Korea-EU Alice 2004 Conclusion Conclusion 1.Charmonium states seems to survive up to 1.6 Tc and is not easily dissociated by thermal quarks and gluons. But nevertheless provides an extremely useful observable. ⇒ Detailed theoretical and experimental analysis is needed. QCD 2 nd order Stark effect by PANDA 2. Precursor effects of QCD phase transition can be observed through QCD 2 nd order Stark effect by PANDA ⇒ Changes of QCD vacuum in nuclear matter and generation of QCD masses