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arXiv · 0706.1848

Quenching of photon and pion spectra at intermediate RHIC energy

Francois Arleo
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Abstract

Single prompt photon and pion spectra in p-p and Au-Au collisions at intermediate RHIC energy, s^1/2 = 62.4 GeV, are computed at large transverse momentum in perturbative QCD. Next-to-leading order calculations in p-p scattering are first presented. The quenching of the prompt photon and pion yield due to energy loss processes in central Au-Au with respect to p-p collisions is then predicted. At this energy, the small phase-space available to produce hard partons makes the pion quenching almost as pronounced as at s^1/2 = 200 GeV, despite the smaller gluon density of the produced medium. In the photon sector, energy loss effects prove small because of this very phase-space restriction, which favours the direct production channel. A significant suppression of high-pt photons is however predicted, because of a strong isospin effect together with the depletion of nuclear parton densities at large x.

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Francois Arleo. 2007-06-13. Quenching of photon and pion spectra at intermediate RHIC energy. https://doi.org/10.1088/1126-6708%2F2007%2F07%2F032

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