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19 April 2024

» arxiv » 1712.4273

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Further studies of isolated photon production with a jet in deep inelastic scattering at HERA
ZEUS Collaboration ; H. Abramowicz ; I. Abt ; L. Adamczyk ; M. Adamus ; R. Aggarwal ; S. Antonelli ; V. Aushev ; Y. Aushev ; O. Behnke ; U. Behrens ; A. Bertolin ; I. Bloch ; I. Brock ; N. H. Brook ; R. Brugnera ; A. Bruni ; P. J. Bussey ; A. Caldwell ; M. Capua ; C. D. Catterall ; J. Chwastowski ; J. Ciborowski ; R. Ciesielski ; A. M. Cooper-Sarkar ; M. Corradi ; R. K. Dementiev ; R. C. E. Devenish ; S. Dusini ; B. Foster ; G. Gach ; E. Gallo ; A. Garfagnini ; A. Geiser ; A. Gizhko ; L. K. Gladilin ; Yu. A. Golubkov ; G. Grzelak ; M. Guzik ; C. Gwenlan ; O. Hlushchenko ; D. Hochman ; R. Hori ; Z. A. Ibrahim ; Y. Iga ; M. Ishitsuka ; N. Z. Jomhari ; I. Kadenko ; S. Kananov ; U. Karshon ; P. Kaur ; D. Kisielewska ; R. Klanner ; U. Klein ; I. A. Korzhavina ; A. Kotański ; N. Kovalchuk ; H. Kowalski ; B. Krupa ; O. Kuprash ; M. Kuze ; B. B. Levchenko ; A. Levy ; M . Lisovyi ; E. Lobodzinska ; B. Löhr ; E. Lohrmann ; A. Longhin ; O. Yu. Lukina ; J. Malka ; A. Mastroberardino ; F. Mohamad Idris ; N. Mohammad Nasir ; V. Myronenko ; K . Nagano ; Yu. Onishchuk ; E. Paul ; W. Perlański ; N. S. Pokrovskiy ; A. Polini ; M. Przybycień ; M. Ruspa ; D. H. Saxon ; M. Schioppa ; U. Schneekloth ; T. Schörner-Sadenius ; L. M. Shcheglova ; O. Shkola ; Yu. Shyrma ; I. O. Skillicorn ; W. Słomiński ; A. Solano ; L. Stanco ; N. Stefaniuk ; A. Stern ; P. Stopa ; J. Sztuk-Damb ietz ; E. Tassi ; K. Tokushuku ; J. Tomaszewska ; T. Tsurugai ; M. Turcato ; O. Turkot ; T. Tymieniecka ; A. Verbytskyi ; W. A. T. WanAbdullah ; K. Wichmann ; M. Wing ; S. Yamada ; Y. Yamazaki ; A. F. Żarnecki ; L. Zawiejski ; O. Zenaiev ; B. O. Zhautykov ;
Date:	12 Dec 2017
Abstract:	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 $326,$ pb$^{-1}$ in the range of exchanged-photon virtuality $10 - 350$ 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 $2.5 <E_T^{jet}<35$ GeV and $-1.5<eta^{jet}< 1.8$, 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.
Source:	arXiv, 1712.4273
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