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Recent results on jet energy loss and direct photons at RHIC

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Abstract.

Measurements of the π0 and direct photon nuclear modification factors in p+p and A+A collisions in the PHENIX experiment at RHIC will be reviewed and recent results at \(\sqrt{S_{NN}}=62.4\) GeV will be presented. Using for the first time the p+p reference measured in the same experiment instead of averaging world data the π0 suppression turns out to be almost as large at \(\sqrt{s_{NN}}=62.4\) GeV as at \(\sqrt{s_{NN}}=200\) GeV, implying gluon densities dNg/dy>800. Possible origins of photon suppression at high pT in \(\sqrt{s_{NN}}=200\) GeV are discussed in light of the new results on photon RAA at \(\sqrt{s_{NN}}=62.4\) GeV.

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  1. Brookhaven National Laboratory, Upton, NY, 11961, USA

    G. David

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  1. G. David
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Correspondence to G. David.

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David, G. Recent results on jet energy loss and direct photons at RHIC. Eur. Phys. J. Spec. Top. 155, 27–36 (2008). https://doi.org/10.1140/epjst/e2008-00586-1

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