AGS-RHIC User’s Workshop --

Heavy Quark Production at RHIC

Large Seminar Room, Physics Bldg

May 13, 2004

Organizers: Vince Cianciolo, ORNL

Huan Zhong Huang, UCLA

Kirill Tuchin, BNL

Workshop Program

Chair: Kirill Tuchin9:00-9:05 Remarks from Organizers9:05-9:50 Wei Xie (PHENIX) ‘PHENIX charm results in Au+Au, d+Au and p+p collisions’9:50-10:30 Ralf Rapp (TAMU) ‘Charm(onium) re-interactions at RHIC’10:30-11:00 break11:00-11:45 Tom Cormier (STAR) ‘Charm and beauty from inclusive electrons in STAR’11:45-12:30 Mary Bishai (FNAL) Charm and beauty production at the Tevatron’

Chair: Vince Cianciolo2:00-2:40 Dmitri Kharzeev (BNL) ‘Heavy quarks as a probe of QCD matter’2:40-3:20 An Tai (UCLA) ‘Measurement of open charm production from STAR at RHIC’3:20-3:45 Magdalena Djordjevic (Columbia) ‘Heavy quark energy loss in QCD matter’3:45-4:00 break4:00-4:30 Peter Petreczky (BNL) ‘Quarkonia properties at finite temperature from LQCD’4:30-5:00 Cheuk-Yin Wong (ORNL) ‘Dissociation of charmonium by gluons and hadrons’5:00-5:40 Gerd Kunde (PHENIX) ‘Future of charm measurement from PHENIX’

Charm and Beauty reflect

QCD Properties of Matter

• Initial gluon flux and initial temperature of the gluon-dominated matter

• Transition temperature from partons to hadrons

• Color degree of freedom of the matter -- definement

Quarkonium Dynamics in Color Medium

• Recent LQCD calculations J/ can survive up to a temperature > 1.6 Tc

’ melts at or near the Tc

Probes for QCD Color Degree of Freedom !

QCD Color Screening: (T. Matsui and H. Satz, Phys. Lett. B178, 416 (1986))

A color charge in a color medium is screened similar to Debye screening in QED the melting of J/.

c cCharm quarks c-c may not bindInto J/ in high T QCD medium

Heavy Quark in QCD Medium

• Heavy Quark energy loss in color medium !

-- dead cone effect ?• Charm enhancement from high temperature

gluonic matter (Tinit > 500 MeV)!

An Intriguing Scenario ?!

PT

RAA

1.0

Light hadrons

Open Charm

Heavy Quark Production Dynamics

• Charm and Beauty Production at Tevatron (CDF and D0) and pQCD

• Quarkonia production – color singlet/octet

• kT Factorization versus co-linear factorization

• Heavy quark production and the Color Glass Condensate

J/ suppression or enhancement !

• Quarkonium suppression:– Color Screening– Partonic dissociation by gluons– Hadronic dissociation by co-movers– At Forward Rapidity and Color Glass Condensate– ?

• Quarkonium enhancement:– Large initial charm pair production– Thermal statistical formation of J/ at hadronization

or charm quark coalescence

Charm Dynamics in Bulk Partonic Matter

Volcanic low pT – Bulk matter flows Volcanic mediate pT – Spatter (clumps)

Does Charm Flow?Does charm meson/baryon form from multi-parton dynamics?

Thermalization of partonic matter -- charm elliptic flow v2 ! -- charm hadron chemistry !

Constituent quark scaling for charmed baryon/meson ?!

Minv (GeV)

J/->+-

2

RHIC Heavy Quark Physics Program

PHENIX PRELIMINARY

PHENIX electron and J/ measurement!

See Wei Xie and Gerd Kunde’s talk

~ x100 more data in Run-4! Minv (GeV)

J/->e+e-

Clear J/ signal already observed by muon and electron arms in a small subset of Run-4 Au+Au data.

RHIC Heavy Quark Physics ProgramSTAR electron from TPC,TOF & EMC -- Tom Cormier

direct open charm from TPC -- An Tai

RHIC Exp Program from PHENIX and STAR:Au+Au data on charm and beauty ,Charm flow, J/ and Upsilon !

Detector Upgrade: PHENIX -- VTX STAR -- TOF and microVertex Detector (MVD) !

STAR Preliminary

Beauty

Charm

Workshop Program

Chair: Kirill Tuchin9:00-9:05 Remarks from Organizers9:05-9:50 Wei Xie (PHENIX) ‘PHENIX charm results in Au+Au, d+Au and p+p collisions’9:50-10:30 Ralf Rapp (TAMU) ‘Charm(onium) re-interactions at RHIC’10:30-11:00 break11:00-11:45 Tom Cormier (STAR) ‘Charm and beauty from inclusive electrons in STAR’11:45-12:30 Mary Bishai (FNAL) Charm and beauty production at the Tevatron’

Chair: Vince Cianciolo2:00-2:40 Dmitri Kharzeev (BNL) ‘Heavy quarks as a probe of QCD matter’2:40-3:20 An Tai (UCLA) ‘Measurement of open charm production from STAR at RHIC’3:20-3:45 Magdalena Djordjevic (Columbia) ‘Heavy quark energy loss in QCD matter’3:45-4:00 break4:00-4:30 Peter Petreczky (BNL) ‘Quarkonia properties at finite temperature from LQCD’4:30-5:00 Cheuk-Yin Wong (ORNL) ‘Dissociation of charmonium by gluons and hadrons’5:00-5:40 Gerd Kunde (PHENIX) ‘Future of charm measurement from PHENIX’

Large Seminar Room, Physics Bldg May 13, 2004