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First Measurement of Near-Threshold J/psi Exclusive Photoproduction off the Proton

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dc.contributor.authorAli, A.
dc.contributor.authorAmaryan, M.
dc.contributor.authorAnassontzis, E. G.
dc.contributor.authorAustregesilo, A.
dc.contributor.authorBerdnikov, V.
dc.contributor.authorRomanov, D.
dc.contributor.authorSomov, S.
dc.contributor.authorСомов, Сергей Всеволодович
dc.date.accessioned2024-11-21T11:03:30Z
dc.date.available2024-11-21T11:03:30Z
dc.date.issued2019
dc.description.abstractWe report on the measurement of the gamma p -> J/psi p cross section from E-gamma = 11.8 GeV down to the threshold at 8.2 GeV using a tagged photon beam with the GlueX experiment. We find that the total cross section falls toward the threshold less steeply than expected from two-gluon exchange models. The differential cross section d sigma/dt has an exponential slope of 1.67 +/- 0.39 GeV-2 at 10.7 GeV average energy. The LHCb pentaquark candidates P-c(+) can be produced in the s channel of this reaction. We see no evidence for them and set model-dependent upper limits on their branching fractions B(P-c(+) -> J/psi p) and cross sections sigma(gamma p -> P-c(+)) x B(P-c(+) -> J/psi p).
dc.identifier.citationFirst Measurement of Near-Threshold J/psi Exclusive Photoproduction off the Proton / Ali, A [et al.] // Physical Review Letters. - 2019. - 123. - № 7. - 10.1103/PhysRevLett.123.072001
dc.identifier.doi10.1103/PhysRevLett.123.072001
dc.identifier.urihttps://www.doi.org/10.1103/PhysRevLett.123.072001
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85070894537&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000480611900007
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/18543
dc.relation.ispartofPhysical Review Letters
dc.titleFirst Measurement of Near-Threshold J/psi Exclusive Photoproduction off the Proton
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue7
oaire.citation.volume123
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