Threshold resummation for the prompt-photon cross section revisited

We study the resummation of large logarithmic perturbative corrections to the partonic cross sections relevant for the process pp→γX at high transverse momentum of the photon. These corrections arise near the threshold for the partonic reaction and are associated with soft-gluon emission. We especia...

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Publicado: 2005
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v72_n1_p1_DeFlorian
http://hdl.handle.net/20.500.12110/paper_15507998_v72_n1_p1_DeFlorian
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_15507998_v72_n1_p1_DeFlorian2023-06-08T16:21:58Z Threshold resummation for the prompt-photon cross section revisited We study the resummation of large logarithmic perturbative corrections to the partonic cross sections relevant for the process pp→γX at high transverse momentum of the photon. These corrections arise near the threshold for the partonic reaction and are associated with soft-gluon emission. We especially focus on the resummation effects for the contribution to the cross section where the photon is produced in jet fragmentation. Previous calculations in perturbation theory at fixed order have established that this contribution is a subdominant part of the cross section. We find, however, that it is subject to much larger resummation effects than the direct (nonfragmentation) piece and therefore appears to be a significant contribution in the fixed-target regime, not much suppressed with respect to the direct part. Inclusion of threshold resummation for the fragmentation piece leads to some improvement in comparisons between theoretical calculations and experimental data. © 2005 The American Physical Society. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v72_n1_p1_DeFlorian http://hdl.handle.net/20.500.12110/paper_15507998_v72_n1_p1_DeFlorian
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We study the resummation of large logarithmic perturbative corrections to the partonic cross sections relevant for the process pp→γX at high transverse momentum of the photon. These corrections arise near the threshold for the partonic reaction and are associated with soft-gluon emission. We especially focus on the resummation effects for the contribution to the cross section where the photon is produced in jet fragmentation. Previous calculations in perturbation theory at fixed order have established that this contribution is a subdominant part of the cross section. We find, however, that it is subject to much larger resummation effects than the direct (nonfragmentation) piece and therefore appears to be a significant contribution in the fixed-target regime, not much suppressed with respect to the direct part. Inclusion of threshold resummation for the fragmentation piece leads to some improvement in comparisons between theoretical calculations and experimental data. © 2005 The American Physical Society.
title Threshold resummation for the prompt-photon cross section revisited
spellingShingle Threshold resummation for the prompt-photon cross section revisited
title_short Threshold resummation for the prompt-photon cross section revisited
title_full Threshold resummation for the prompt-photon cross section revisited
title_fullStr Threshold resummation for the prompt-photon cross section revisited
title_full_unstemmed Threshold resummation for the prompt-photon cross section revisited
title_sort threshold resummation for the prompt-photon cross section revisited
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v72_n1_p1_DeFlorian
http://hdl.handle.net/20.500.12110/paper_15507998_v72_n1_p1_DeFlorian
_version_ 1768542052689117184

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