Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-09
Nucl.Phys. A723 (2003) 467-482
Physics
High Energy Physics
High Energy Physics - Phenomenology
minor corrections, version accepted for publication in Nuclear Physics A
Scientific paper
10.1016/S0375-9474(03)01447-7
We present results for the large-$p_T$ inclusive $\pi^0$ production in p-p and A-A collisions at RHIC and LHC energies. We include the full next-to-leading order radiative corrections, $O(\alpha_s^3)$, and nuclear effects such as parton energy loss and nuclear shadowing. We find the next-to-leading order corrections and the parton energy loss effect to be large and $p_T$ dependent, while the nuclear shadowing effects are small ($< 10%$). We calculate the ratio of prompt photons to neutral pions produced in heavy ion collisions and show that at RHIC energies this ratio increases with $p_T$ approaching one at $p_T \sim 8$ GeV, due to the large suppression of $\pi^0$ production. We show that at the LHC, this ratio has a steep $p_T$ dependence and approaches 25% effect at $p_T \sim 40$ GeV. We discuss theoretical uncertainties inherent in our calculation, such as choice of the renormalization, factorization and fragmentation scales and the K-factors which signify the size of higher-order corrections.
Jalilian--Marian Jamal
Jeon Sangyong
Sarcevic Ina
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