First measurement of the vertical bar t vertical bar-dependence of coherent J/psi photonuclear production

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http://hdl.handle.net/10138/332644

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The ALICE Collaboration , Acharya , S , Adamova , D , Kim , D J , Krizek , F , Onnerstad , A , Parkkila , J E , Rytkönen , H M , Räsänen , S , Saarimäki , O A M , Slupecki , M & Trzaska , W H 2021 , ' First measurement of the vertical bar t vertical bar-dependence of coherent J/psi photonuclear production ' , Physics Letters B , vol. 817 , 136280 . https://doi.org/10.1016/j.physletb.2021.136280

Title: First measurement of the vertical bar t vertical bar-dependence of coherent J/psi photonuclear production
Author: The ALICE collaboration; Acharya, S.; Adamova, D.; Kim, D. J.; Krizek, F.; Onnerstad, A.; Parkkila, J. E.; Rytkönen, Heidi Maria; Räsänen, Sami; Saarimäki, Oskari Antti Matti; Slupecki, M.; Trzaska, W. H.
Contributor: University of Helsinki, University of Jyväskylä
University of Helsinki, The Czech Academy of Sciences
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
Date: 2021-06-10
Language: eng
Number of pages: 13
Belongs to series: Physics Letters B
ISSN: 0370-2693
URI: http://hdl.handle.net/10138/332644
Abstract: The first measurement of the cross section for coherent J/Psi photoproduction as a function of vertical bar t vertical bar, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb-Pbcollisions at a centre-of-mass energy per nucleon pair root s(NN) = 5.02 TeV with the J/Psi produced in the central rapidity region vertical bar y vertical bar < 0.8, which corresponds to the small Bjorken-xrange (0.3 - 1.4) x 10(-3). The measured vertical bar t vertical bar-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky-Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken- x. (C) 2021 The Author(s). Published by Elsevier B.V.
Subject: 114 Physical sciences
PB-PB COLLISIONS
PHOTOPRODUCTION
PHYSICS
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