Quark Matter 2018

Estimation of background for photon-hadron correlations in proton-lead collisions at sqrt(sNN) = 5.02 TeV with ALICE

May 15, 2018, 5:00 PM

2h 40m

First floor and third floor (Palazzo del Casinò)

Poster Electromagnetic and weak probes Poster Session

Speaker

Barbara Jacak (Lawrence Berkeley National Lab. (US))

Description

This poster presents a study of an estimation of the background for the measurement of photon-hadron correlations in 5.02 TeV proton-lead collisions. Photon-hadron correlations measure the fragmentation function, which may be modified by energy loss in the QGP. The energy of the photon is not affected by the QGP, so it gives information about the energy of the parton prior to interaction with the QGP. This parton fragments into a jet from which the hadron arises. The main background for this measurement are photons from meson decays. This is estimated via a parameterization of the measurement of the pi0 and eta cross sections and theoretical calculations of the direct photon cross-section using JETPHOX and PeTeR. In order to ensure purity of the photon trigger, we investigate template fits to a novel shower shape variable, which is being developed for the ALICE electromagnetic calorimeter.

Presentation materials

rgamma-qm18-poster.pdf