Speaker
Description
In order to differentiate photons produced from different origins at hadrons collider, it is necessary to impose some isolation requirements. For cones with small radius $R$, photon isolation effect can be captured by a fragmentation function describing the fragmentation of a parton into a photon accompanied by soft radiation. We computed these fragmentation functions for fixed energy cone and Frixione cone to gain a better understanding of the effect of the isolation parameters on the cross section of $ p p \to \gamma + X$. The fragmentation function prediction is compared to the NLO predictions. Finally, we resum the leading logarithms of $R$ and of $\epsilon_{\gamma}$ the ratio of energy inside the cone to the photon energy and compared it to the measurement performed at ATLAS.
