Hard pion and prompt photon at RHIC, from single to double inclusive production

Details Hard pion and prompt photon at RHIC, from single to double inclusive production Hard pion and prompt photon at RHIC, from single to double inclusive production

2006-01-10

arxiv.org/abs/hep-ph/0601075v1

JHEP 0609 (2006) 015

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, 11 figures

Scientific paper

10.1088/1126-6708/2006/09/015

Single pion and prompt photon large transverse momentum spectra in p-p and Au-Au collisions are computed in perturbative QCD at RHIC energy, s^1/2 = 200 GeV. Next-to-leading order calculations are discussed and compared with p-p scattering data. Subsequently, quenching factors are computed to leading order for both pions and photons within the same energy loss model. The good agreement with PHENIX preliminary data allows for a lower estimate of the energy density reached in central Au-Au collisions, epsilon > 10 GeV/fm^3. Double inclusive photon-pion production in p-p and Au-Au collisions is then addressed. Next-to-leading order corrections prove rather small in p-p scattering. In Au-Au collisions, the quenching of momentum-correlation spectra is seen to be sensitive to parton energy loss processes, which would help to understand how the fragmentation dynamics is modified in nuclear collisions at RHIC.

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