Title Inelastic production of $J/\Psi$ mesons in photoproduction and deep inelastic scattering at HERAInelastic production of $J/\Psi$ mesons in photoproduction and deep inelastic scattering at HERA Author Aaron, F.D. de Wolf, E.A. Janssen, X. Van Mechelen, P. et al. Faculty/Department Faculty of Sciences. Physics Research group Elementary Particle Physics Publication type article Publication 2010Berlin, 2010 Subject Physics Source (journal) European physical journal : C : particles and fields. - Berlin Volume/pages 68(2010):3/4, p. 401-420 ISSN 1434-6044 ISI 000280642600004 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract A measurement is presented of inelastic photo- and electroproduction of J/ψ mesons in ep scattering at HERA. The data were recorded with the H1 detector in the period from 2004 to 2007. Single and double differential cross sections are determined and the helicity distributions of the J/ψ mesons are analysed. The results are compared to theoretical predictions in the colour singlet model and in the framework of non-relativistic QCD. Calculations in the colour singlet model using a k T factorisation ansatz are able to give a good description of the data, while colour singlet model calculations to next-to-leading order in collinear factorisation underestimate the data. E-info https://repository.uantwerpen.be/docman/iruaauth/b00854/5f08311d56a.pdf http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000280642600004&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000280642600004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000280642600004&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle