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Probing the gluon density of the proton in the exclusive photoproduction of vector mesons at the LHC : a phenomenological analysis

Gonçalves, V. P. LU ; Martins, L. A S and Sauter, W. K. (2016) In European Physical Journal C. Particles and Fields 76(2). p.1-8
Abstract

The current uncertainty on the gluon density extracted from the global parton analysis is large in the kinematical range of small values of the Bjorken-x variable and low values of the hard scale (Formula presented.). An alternative to reduces this uncertainty is the analysis of the exclusive vector meson photoproduction in photon–hadron and hadron–hadron collisions. This process offers a unique opportunity to constrain the gluon density of the proton, since its cross section is proportional to the gluon density squared. In this paper we consider current parametrisations for the gluon distribution and estimate the exclusive vector meson photoproduction cross section at HERA and LHC using the leading logarithmic formalism. We perform a... (More)

The current uncertainty on the gluon density extracted from the global parton analysis is large in the kinematical range of small values of the Bjorken-x variable and low values of the hard scale (Formula presented.). An alternative to reduces this uncertainty is the analysis of the exclusive vector meson photoproduction in photon–hadron and hadron–hadron collisions. This process offers a unique opportunity to constrain the gluon density of the proton, since its cross section is proportional to the gluon density squared. In this paper we consider current parametrisations for the gluon distribution and estimate the exclusive vector meson photoproduction cross section at HERA and LHC using the leading logarithmic formalism. We perform a fit of the normalisation of the (Formula presented.) cross section and the value of the hard scale for the process and demonstrate that the current LHCb experimental data are better described by models that assume a slow increasing of the gluon distribution at small x and low (Formula presented.).

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author
organization
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type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
76
issue
2
pages
8 pages
publisher
Springer
external identifiers
  • Scopus:84959324026
ISSN
1434-6044
DOI
10.1140/epjc/s10052-016-3917-z
language
English
LU publication?
yes
id
5e693b15-736d-4b3c-9926-5ac1a0cc2fe8
date added to LUP
2016-07-15 07:40:07
date last changed
2016-11-03 09:30:36
@misc{5e693b15-736d-4b3c-9926-5ac1a0cc2fe8,
  abstract     = {<p>The current uncertainty on the gluon density extracted from the global parton analysis is large in the kinematical range of small values of the Bjorken-x variable and low values of the hard scale (Formula presented.). An alternative to reduces this uncertainty is the analysis of the exclusive vector meson photoproduction in photon–hadron and hadron–hadron collisions. This process offers a unique opportunity to constrain the gluon density of the proton, since its cross section is proportional to the gluon density squared. In this paper we consider current parametrisations for the gluon distribution and estimate the exclusive vector meson photoproduction cross section at HERA and LHC using the leading logarithmic formalism. We perform a fit of the normalisation of the (Formula presented.) cross section and the value of the hard scale for the process and demonstrate that the current LHCb experimental data are better described by models that assume a slow increasing of the gluon distribution at small x and low (Formula presented.).</p>},
  author       = {Gonçalves, V. P. and Martins, L. A S and Sauter, W. K.},
  issn         = {1434-6044},
  language     = {eng},
  month        = {02},
  number       = {2},
  pages        = {1--8},
  publisher    = {ARRAY(0xb53b680)},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Probing the gluon density of the proton in the exclusive photoproduction of vector mesons at the LHC : a phenomenological analysis},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-016-3917-z},
  volume       = {76},
  year         = {2016},
}