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{\small \it Quark Matter 2006 Conf. - Nov. 14-20, 2006 - Shanghai
- P. R. China}

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 \bf{Measuring Bremsstrahlung Photons 
   in $\sqrt{s} = 200 \mathrm{GeV}$ p-p Collisions}
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\centerline{ {\bf Ali Hanks}$^{\rm a}$}

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\centerline{$^{\rm a}$Department of Physics, Columbia University, 538 West 120th St}
 \centerline{New York, NY, 10027, USA, {\it ahanks@nevis.columbia.edu}}

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According to recent pQCD calculations, the bremsstrahlung photon cross-section makes up a significant portion of the total direct photon cross-section in p-p collisions.  In heavy ion collisions, modification of the  bremsstrahlung photon production can provide information about the evolution of jets as they propagate through the medium.  Measuring the cross-section in both p-p and Au-Au collisions will provide an important test of both pQCD predictions and predictions for the nuclear modification factor.

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Bremsstrahlung photons can be measured directly by selecting photons associated with a jet through hadron-photon correlations.  Most of the photons correlated with jets come from the $\pi^0$ and other hadronic decays and must be tagged and subtracted from the inclusive correlations.  Using this method we can obtain a measure of the bremsstrahlung photon contribution to investigate medium-induced modifications to the jet fragmentation function.  We present studies of this methodology and discuss its potential for application to recent PHENIX data.


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