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Inelastic J ψ production in deep inelastic scattering from hydrogen and deuterium and the gluon distribution of free nucleons
Università di Torino, INFN, Turin, Italy.
University of California, Santa Cruz CA, United States.ORCID iD: 0000-0002-9007-0410
Université de l'Etat Mons, Mons, Belgium.
Number of Authors: 73
1991 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 258, no 3-4, 493-498 p.Article in journal (Refereed) Published
Abstract [en]

We present results on inelastic J/PSI-production from muon interactions with hydrogen and deuterium at an incident muon energy of 280 GeV. The measured cross section ratio per nucleon for muon-induced J/PSI-production in deuterium and hydrogen was found to be R(D2/H2) = 1.01 +/- 0.15. The colour singlet model is shown to provide a good description of the observed differential cross section apart from a normalisation factor. The comparison between the observed cross section and the colour singlet model prediction allows the extraction of the gluon structure function G(chi) of the nucleon. The momentum fraction-chi of the nucleon carried by the gluon is measured in the range of chi = [0.02, 0.30]. The normalised gluon distribution of free nucleons thus found can be parametrised as chi-G(chi) = 1/2 (eta + 1)(1 - chi)eta, with eta = 5.1 +/- 0.9 (stat).

Place, publisher, year, edition, pages
Elsevier, 1991. Vol. 258, no 3-4, 493-498 p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:oru:diva-57751DOI: 10.1016/0370-2693(91)91124-EISI: A1991FJ11500047Scopus ID: 2-s2.0-0000938417OAI: oai:DiVA.org:oru-57751DiVA: diva2:1098141
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-10-18Bibliographically approved

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