TY - JOUR
T1 - Prompt photon and inclusive π0 production at RHIC and LHC
AU - Jeon, S.
AU - Jalilian-Marian, J.
AU - Sarcevic, I.
N1 - Funding Information:
We have calculated inclusive pion and prompt photon production cross sections in proton-proton and in heavy-ion collisions at RHIC and LHC energies. We have incorrporated next-to-leading order contributions, initial state parton distribution functions in a nucleus and medium induced parton energy loss by modifying the final state pion and photon fragmentation functions. We find the nuclear K-factor, which signifies higher order corrections, to be large and pr dependent and the shape of the pi distribution insensitive to the choice of scales [lo]. The nuclear shadowing effects are small at RHIC and LHC energies. We show that 7r” suppression observed at RHIC can be attributed to the parton energy loss. We also present results for the suppression of prompt photon production at RHIC and LHC, and for the ratio of prompt photon and 7r” cross sections, of relevance to separating different sources of photon production. We are indebted to P. Aurenche and J. P. Guillet for providing us with the fortran routines for calculating 7r” and photon production in hadronic collisions and for many useful discussions. We thank D. d’Enterria and M. Tannenbaum for many helpful discussions and suggestions. I.S. is supported in part through U.S. Department of Energy Grants Nos. DE-FG03-93ER40792 and DE-FG02-95ER40906. S.J. is supported in part by the Natural Sciences and Engineering Research Council of Canada. J.J-M. is supported in part by a PDF from BSA and by U.S. Department of Energy under Contract No. DE-AC02-98CH10886.
PY - 2003/3/10
Y1 - 2003/3/10
N2 - We present results for prompt photon and inclusive π0 production in p-p and A-A collisions at RHIC and LHC energies. We include the full next-to-leading order radiative corrections and nuclear effects, such as nuclear shadowing and parton energy loss. We find the nextto-leading order corrections to be large and pT dependent. We show how measurements of π0 production at RHIC and LHC, at large pT, can provide valuable information about the nature of parton energy loss. We calculate the ratio of prompt photons to neutral pions and show that at RHIC energies this ratio increases with pT approaching one at p T ∼ 10 GeV, due to the large suppression of π0 production. We show that at the LHC, this ratio has steep pT dependence and approaches 10% effect at pT ∼ 20 GeV.
AB - We present results for prompt photon and inclusive π0 production in p-p and A-A collisions at RHIC and LHC energies. We include the full next-to-leading order radiative corrections and nuclear effects, such as nuclear shadowing and parton energy loss. We find the nextto-leading order corrections to be large and pT dependent. We show how measurements of π0 production at RHIC and LHC, at large pT, can provide valuable information about the nature of parton energy loss. We calculate the ratio of prompt photons to neutral pions and show that at RHIC energies this ratio increases with pT approaching one at p T ∼ 10 GeV, due to the large suppression of π0 production. We show that at the LHC, this ratio has steep pT dependence and approaches 10% effect at pT ∼ 20 GeV.
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U2 - 10.1016/S0375-9474(02)01491-4
DO - 10.1016/S0375-9474(02)01491-4
M3 - Article
AN - SCOPUS:4243824121
SN - 0375-9474
VL - 715
SP - 795c-798c
JO - Nuclear Physics A
JF - Nuclear Physics A
ER -