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 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))

Presentation Materials