330 likes | 507 Views
Hadron Physics at RHIC. Su Houng Lee 1. Few words on hadronic molecule candidates and QCD sum rules 2 . Few words on diquarks and heavy Multiquark States 3. Exotics from Belle- Heavy Ion . Recent Highlights in Hadron Physics – Heavy quark sector. Babar: D SJ (2317) 0 +
E N D
Hadron Physics at RHIC Su Houng Lee 1. Few words on hadronic molecule candidates and QCD sum rules 2. Few words on diquarks and heavy Multiquark States 3. Exotics from Belle- Heavy Ion
Recent Highlights in Hadron Physics – Heavy quark sector Babar: DSJ(2317) 0+ Puzzle in Constituent Quark Model(2400) • D0 K+ (2358) threshold effect • Chiral partner of (0-1-) • Tetraquark molecule ? X(3872) G<10 MeV, Y(4260), Z(4430) G<50 y’p Z(4051),Z(4248) cc1p Must contain cc ?
Newly observed states M. Nielsen, F. Navarra, SHL: arXiv:0911.1958: Review paper
QCD sum rule results • sum rule : Large M2 : Small M2 Such Good Borel curve exists when pole Dom. Resonance or pole exists OPE Conv. 2. Large overlap f M2 • In principle QCD can not distinguish between diquark configuration and molecular configuration • but if the overlap is large, plateau and OPE convergence, pole dominance • can learn which current has large overlap
QCD sum rules X(3872): SHL, K. Morita, M. Nielsen (PRD08) • J=[s][V] Tetraquark current vs. J=DD* Molecular current Small width <2 MeV
Previous Work on Multiquark hadrons - Light quark sector Scalar tetraquark (Jaffe 76) L(1405) (Jido, Sekihara..) N S K p + Search for Q+ pentaquark Search for H dibaryon
What are the systematics? What are these particles? Where else should we look for?
Some insights from for Multiquark configurations in a schematic quark model (with S. Yasui )
Color spin interaction (De Rujula, Georgi, Glashow..) • color spin interaction: • Diquark configurations vs. quark-antiquarkconfigurations q2 q4 q1 q2
Diquarkcorrelation inside Baryons Example u d d u s s
Works very well with 3x CB = CM =635 mu2 d u u d x 3= quark-antiquarkin Meson p r d u d u
Q+ (Jaffe Wilczek conf) in a naïve quark model L=1 Q+ P K u d u d s u d d 1/2+ u s L2 contribution • - 500 MeV in Five body quark model by Hiyama, Hosaka et al (06)
2SC Phase CFL Phase of color superconductivity ? Di-bayron (Conf 1) – (qq) (qq) (qq) H di-baryon u d u d u d u s 0+ s s d s H di-baryon could be bound • unfortunately not found in so far
Multiquark configuration: • Diquark attracation vs quark-antiquark q1 q3 q2 • diquark picture: Yasui, Ko, Liu, Lee,.. (EJP08,EJP09)
Diquark picture for L (with D. Jido , K. Kim) • Magnetic moment: L = (ud)0 s d u s • QCD sum rule with diquark field f d s u OPE
Result- cont • Constituent diquark mass
Recently observed states with hidden charm states • Most probably molecular state NOT tetraquark q1 q3 c c q1 c q1 q3 q1 q3 c q3 c c c c p p p D* D* D D1 X(3872) Z(4430)
Where are the tetraquarks and multiquark configurations? Dense matter?
Tetra-quark - configurations Binding against decay = (Mass of 2 Mesons) – (Mass of Tetraquark) 0+ 0- 0- d u d d u u u d 0+ 0- 0- c u d c b u b d
Tetra-quark – hadronic weak decay modes 0- 1- 1+ c u d c c u c d - Binding against decay = - 79.3 MeV
c c Previous works on Tcc Z. Zouzou, B. Silverstre-Brac, C. Gilgnooux, J Richard (86), D. Janc, M. Rosina (04), Y. Cui, S. L. Zhu (07) QCD sum rules: F Navarra, M. Nielsen, SHLee, PLB 649, 166 (2007) simple diquark: SHL, S. Yasui, W.Liu, C Ko EPJ C54, 259 (2008), SHL, S. Yasui: EPJ C (09) Belle: PRL 98, 082001 (07) e+ e- J/y + X(3904) DD* Canlook for 1+ (Tcc) e Tcc(3800) X(3904) c c e+ SHL, S Yasui, W Liu, C Ko (08)
Di-bayron – general considerations H di-baryon H di-baryon u d u s 1 2 0+ 3 4 1 2 3 4 0+ d s 5 6 5 6 B B Conf-1
Di-bayron – general considerations di-baryon B B 1 2 3 4 Conf-2 1 2 3 4 0+ 5 6 5 6
Di-baryon (Conf 2) – (qq) (qq) (qQ) Hc di-baryon P Xc 0+ s u d u u d u s u c u c Hcdi-baryon
New perspective of Hadron Physics from Heavy Ion Collision • large number of c , b quark production • Larger source size: A. Ohnishi .. • Vertex detector: weakly decaying exotics : FAIR 104 D0 /month
Exotics Factory J/ψ, χC u u d d s s RHIC,LHC c ΛC /D c d T u Quark-gluon plasma J/ψ p Tcc u p d Exotics Factory u u d u Nuclear matter Color superconductivity m
ExHIC (collaboration) • Started from Molecular workshop • 12 people 9 institutions
First project: Production rate 1. Mol=usual hadron > Exotic 2. Realistic measurement of exotics are possible
Production ratios for predicted Multiquarks • Qc production at RHIC and LHC Qc/D > 0.74 x 10 -4 Qc/Ds> 0.23 x 10 -3 • Hc production at RHIC and LHC Hc/D > 0.8 x 10 -4 Hc/Ds> 0.25 x 10 -3 • Tcc production Tcc/D > 0.34 x 10 -4 RHIC > 0.8 x 10 -4 LHC
More ExHIC Physics • General considerations for molecular states • Production rates at Belle : ExoticsfromHIgh energy e+e- Collision • Pt dependence of Lc/D ratio ……
Summary of talk • We are witnessing an exciting time in hadron physics : • Categorizing excited states and understanding exotics • Systematics ?? • Diquarks are unique features of QCD, Mutltiquark states will exits in Heavy sector, due to diquark structure Tcc (ud cc) Qbs (udusb), Hc(udusuc) real weak decay, small background in RHIC, LHC can be a very useful heavy exotic factory If found, it will be the first flavor exotic ever, will tell us about QCD, q-q interaction and dense matter great step forward in QCD 3. Belle + Heavy Ion can provide new perspectives in the search