Neutral pion production in Au+Au collisions at {radical}(s{sub NN})=200 GeV

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.044905· OSTI ID:21293970

Abelev, B I; Barannikova, O; Betts, R R; Garcia-Solis, E J; Hofman, D J; Hollis, R S; Iordanova, A; Kauder, K; Suarez, M C ^[1]; Aggarwal, M M; Bhati, A K; Kumar, L; Pruthi, N K ^[2]; Ahammed, Z; Chattopadhyay, S; Mazumdar, M R. Dutta; Ganti, M S; Ghosh, P; Mohanty, B; Nayak, T K ^[3]

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1. University of Illinois at Chicago, Chicago, Illinois 60607 (United States)
2. Panjab University, Chandigarh 160014 (India)
3. Variable Energy Cyclotron Centre, Kolkata 700064 (India)

The results of midrapidity (0<y<0.8) neutral pion spectra over an extended transverse momentum range (1<p{sub T}<12 GeV/c) in {radical}(s{sub NN})=200 GeV Au+Au collisions, measured by the STAR experiment, are presented. The neutral pions are reconstructed from photons measured either by the STAR Barrel Electro-Magnetic Calorimeter or by the Time Projection Chamber via tracking of conversion electron-positron pairs. Our measurements are compared to previously published {pi}{sup {+-}} and {pi}{sup 0} results. The nuclear modification factors R{sub CP} and R{sub AA} of {pi}{sup 0} are also presented as a function of p{sub T}. In the most central Au+Au collisions, the binary collision scaled {pi}{sup 0} yield at high p{sub T} is suppressed by a factor of about 5 compared to the expectation from the yield of p+p collisions. Such a large suppression is in agreement with previous observations for light quark mesons and is consistent with the scenario that partons suffer considerable energy loss in the dense medium formed in central nucleus-nucleus collisions at the Relativistic Heavy Ion Collider.

• OSTI ID: 21293970
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 4; Other Information: DOI: 10.1103/PhysRevC.80.044905; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM-ATOM COLLISIONS
BROOKHAVEN RHIC
CALORIMETERS
D QUARKS
ELECTRONS
ENERGY LOSSES
GEV RANGE 100-1000
GOLD
MODIFICATIONS
NUCLEI
PHOTONS
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
POSITRONS
PROTON-PROTON INTERACTIONS
SPECTRA
TIME PROJECTION CHAMBERS
TRANSVERSE MOMENTUM
U QUARKS