# EPS-HEP2019

10-17 July 2019
Ghent
Europe/Brussels timezone

## Further studies of isolated photon production with a jet in deep inelastic scattering at HERA

11 Jul 2019, 18:15
15m
ICC - Baeckeland 3 (Ghent)

### ICC - Baeckeland 3

#### Ghent

Parallel talk QCD and Hadronic Physics

### Speaker

Katsuo Tokushuku (High Energy Accelerator Research Organization (JP))

### Description

Isolated photons with high transverse energy have been studied in deep inelastic $ep$ scattering with the ZEUS detector at HERA, using an integrated luminosity of $326\, \mathrm{pb}^{-1}$ in the range of exchanged-photon virtuality $10 - 350 \,\, \mathrm{GeV}^2$. Outgoing isolated photons with transverse energy $4 < E_T^\gamma < 15$ GeV and pseudorapidity $-0.7 < \eta^\gamma < 0.9$ were measured with accompanying jets having transverse energy and pseudorapidity $2.5 < E_T^{\rm jet} <35$ GeV and $-1.5< \eta^{\rm jet} < 1.8$, respectively. Differential cross sections are presented for the following variables: the fraction of the incoming photon energy and momentum that is transferred to the outgoing photon and the leading jet; the fraction of the incoming proton energy transferred to the photon and leading jet; the differences in azimuthal angle and pseudorapidity between the outgoing photon and the leading jet and between the outgoing photon and the scattered electron. Comparisons are made with theoretical predictions: a leading-logarithm Monte Carlo simulation, a next-to-leading-order QCD prediction, and a prediction using the $k_T$-factorisation approach.

### Primary authors

Matthew Wing (University College London) Katsuo Tokushuku (High Energy Accelerator Research Organization (JP))