16–20 Apr 2018
Kobe University Convention Centre / Kobe International Conference Center
Asia/Tokyo timezone

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

17 Apr 2018, 12:15
20m
503

503

WG4: Hadronic and Electroweak Observables WG4: Hadronic and Electroweak Observables

Speaker

Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

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 author

Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

Co-author

Matthew Wing (University College London)

Presentation materials