CIPANP '03 Jets and high pT hadrons in ST AR 1 Jets and high p T hadrons: results from STAR Peter Jacobs Lawrence Berkeley National Laboratory STAR Collaboration • Au+Au at 200 GeV: • inclusive hadron distributions confrontation with theory • two-particle correlations • first results from d+Au STAR STAR Other STAR high p T talks: A.Tang: Anisotropic Flow (Session 4, Thurs.) M. Miller: High p T correlations (Session 6, Fri.) J. Klay: High p T spectra (Session 6, Fri.)
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CIPANP '03Jets and high pT hadrons in STAR1 Jets and high p T hadrons: results from STAR Peter Jacobs Lawrence Berkeley National Laboratory STAR Collaboration.
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CIPANP '03 Jets and high pT hadrons in STAR 1
Jets and high pT hadrons: results from STARPeter Jacobs
Lawrence Berkeley National LaboratorySTAR Collaboration
• Au+Au at 200 GeV:• inclusive hadron distributions
confrontation with theory• two-particle correlations
• first results from d+Au
STARSTAR
Other STAR high pT talks:A.Tang: Anisotropic Flow (Session 4, Thurs.)M. Miller: High pT correlations (Session 6, Fri.)J. Klay: High pT spectra (Session 6, Fri.)
CIPANP '03 Jets and high pT hadrons in STAR 2
E-M Calorimeter
Time of Flight
Projection Chamber
STAR
CIPANP '03 Jets and high pT hadrons in STAR 3
Partonic energy loss in dense matter
Thick plasma (Baier et al.):
glueSglue
Debye
sRBDMS
q
vLqC
E
2
2
ˆ
~ˆ4
Strong dependence of energy loss on gluon density gluemeasure color charge density at early hot, dense phase
Gluon bremsstrahlung
Thin plasma (GLV, WW):
32
2( , ( )) jet
A a s glue
EE C C d r Log
L
CIPANP '03 Jets and high pT hadrons in STAR 4
Jets at RHIC
p+p jet+jet (STAR@RHIC)
Au+Au ??? (STAR@RHIC)
nucleon nucleonparton
jet
Find this……….in this
CIPANP '03 Jets and high pT hadrons in STAR 5
Jet energy loss via leading hadrons
-
Wang and Gyulassy: partonic energy loss effective softening of fragmentation suppression of leading hadron yield
CIPANP '03 Jets and high pT hadrons in STAR 6
Au+Au and p+p: inclusive charged hadrons
STAR PRL 89, 202301 nucl-ex/0305015
p+p spectrum measured at RHIC
CIPANP '03 Jets and high pT hadrons in STAR 7
Measuring hadron suppression
ddpdT
ddpNdpR
TNN
AA
TAA
TAA /
/)(
2
2
<Nbinary>/inelp+p
p+p cross section
1. Au+Au yield relative to binary-scaled nucleon-nucleon cross section:
2. Au+Au central/peripheral yields scaled by <Nbinary>
Nuclear geometry via Glauber model <Nbinary>
CIPANP '03 Jets and high pT hadrons in STAR 8
Au+Au relative to measured p+p
ddpdT
ddpNdpR
TNN
AA
TAA
TAA /
/)(
2
2
Central collisions: factor ~4-5 suppression
nucl-ex/0305015
CIPANP '03 Jets and high pT hadrons in STAR 9
Binary-scaled central/peripheral
• central collisions: factor ~4-5 suppression • pT>5 GeV/c: suppression ~ independent of pT
nucl-ex/0305015
CIPANP '03 Jets and high pT hadrons in STAR 10
Central/peripheral: dependence on particle species
• inclusive yield relative to p+p: enhancement (pQCD+Cronin) or suppression (saturation)?
CIPANP '03 Jets and high pT hadrons in STAR 15
d+Au centrality tagging
ZDCW
FTPCE
Au d
1. Neutron spectator from deuteron:• Observed via single neutron in ZDCW • Measured to be 20% of minbias • Glauber w/ Hulthen wavefn: also 20% of minbias
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