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dc.contributorUniversitat Ramon Llull. La Salle
dc.contributorCERN
dc.contributor.authorCalvo Gómez, Míriam
dc.contributor.authorCamboni, Alessandro
dc.contributor.authorVilasís Cardona, Xavier
dc.contributor.authorLHCb Collaboration - CERN
dc.date.accessioned2020-11-23T16:59:01Z
dc.date.accessioned2023-10-02T06:25:20Z
dc.date.available2020-11-23T16:59:01Z
dc.date.available2023-10-02T06:25:20Z
dc.date.created2019-11
dc.date.issued2020-03
dc.identifier.urihttp://hdl.handle.net/20.500.14342/3066
dc.description.abstractUsing a data sample corresponding to an integrated luminosity of 2.0 fb−1, collected by the LHCb experiment, the production of the ηc(1S) state in proton–proton collisions at a centre-of-mass energy of s√=13 TeV is studied in the rapidity range 2.0<y<4.5 and in the transverse momentum range 6.5<pT<14.0GeV. The cross-section for prompt production of ηc(1S) mesons relative to that of the J/ψ meson is measured using the p p¯¯¯ decay mode and is found to be σηc(1S)/σJ/ψ=1.69±0.15±0.10±0.18. The quoted uncertainties are, in order, statistical, systematic and due to uncertainties on the branching fractions of the J/ψ→pp¯¯¯ and ηc→pp¯¯¯ decays. The prompt ηc(1S) production cross-section is determined to be σηc(1S)=1.26±0.11±0.08±0.14μb, where the last uncertainty includes that on the J/ψ meson cross-section. The ratio of the branching fractions of b-hadron decays to the ηc(1S) and J/ψ states is measured to be Bb→ηcX/Bb→J ψX=0.48±0.03±0.03±0.05, where the last uncertainty is due to those on the branching fractions of the J/ψ→pp¯¯¯ and ηc→pp¯¯¯ decays. The difference between the J/ψ and ηc(1S) masses is also determined to be 113.0±0.7±0.1MeV, which is the most precise single measurement of this quantity to date.eng
dc.format.extent18 p.cat
dc.language.isoengcat
dc.publisherSpringercat
dc.relation.ispartofThe European Phisical Journal C, 2020, 191cat
dc.rights© CERN
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceRECERCAT (Dipòsit de la Recerca de Catalunya)
dc.subject.otherGran col·lisionador d'hadrons (França i Suïssa)cat
dc.subject.otherCol·lisions (Física nuclear)cat
dc.subject.otherPartícules (Física nuclear)cat
dc.titleMeasurement of the ηc(1S) production cross-section in p p collisions at s√=13 TeVcat
dc.typeinfo:eu-repo/semantics/articlecat
dc.typeinfo:eu-repo/semantics/publishedVersioncat
dc.rights.accessLevelinfo:eu-repo/semantics/openAccess
dc.embargo.termscapcat
dc.subject.udc539
dc.identifier.doihttps://doi.org/10.1140/epjc/s10052-020-7733-0cat


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