Probing the gluon density of the proton in the exclusive photoproduction of vector mesons at the LHC : a phenomenological analysis
(2016) In European Physical Journal C. Particles and Fields 76(2). p.18 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 Bjorkenx 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 Bjorkenx 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
 Gonçalves, V. P. ^{LU} ; Martins, L. A S and Sauter, W. K.
 organization
 publishing date
 20160201
 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
 14346044
 DOI
 10.1140/epjc/s100520163917z
 language
 English
 LU publication?
 yes
 id
 5e693b15736d4b3c99265ac1a0cc2fe8
 date added to LUP
 20160715 07:40:07
 date last changed
 20161103 09:30:36
@misc{5e693b15736d4b3c99265ac1a0cc2fe8, 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 Bjorkenx 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 = {14346044}, language = {eng}, month = {02}, number = {2}, pages = {18}, 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/s100520163917z}, volume = {76}, year = {2016}, }