Access to Photon Fragmentation Functions in Hadronic Jet Production

Understand

We argue that the process $pp \to (\text{jet} \gamma)X$, for which a photon is observed inside a fully reconstructed jet and is treated as part of the jet, offers new probes of the so far little known fragmentation functions for photons.

• We present a next-to-leading-order QCD calculation of the cross section for this process in the limit that the jet is relatively narrow.
• We also investigate the background resulting from the two-photon decay of neutral pions.
• We present numerical results relevant for possible measurements at the LHC and at RHIC.