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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.accessioned2020-11-21T09:37:47Z
dc.date.accessioned2023-10-02T06:25:44Z
dc.date.available2020-11-21T09:37:47Z
dc.date.available2023-10-02T06:25:44Z
dc.date.created2013
dc.date.issued2013-05-29
dc.identifier.urihttp://hdl.handle.net/20.500.14342/3095
dc.description.abstractThe branching fraction of the rare decay B 0 → K ∗0 e + e − in the dilepton mass region from 30 to 1000 MeV/c 2 has been measured by the LHCb experiment, using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, at a centre-of-mass energy of 7 TeV. The decay mode B 0 → J/ψ (e + e −)K ∗0 is utilized as a normalization channel. The branching fraction B(B0→K∗0e+e−) is measured to be $ \mathcal{B}{{\left( {{B^0}\to {K^{*0 }}{e^{+}}{e^{-}}} \right)}^{{30-1000\,{{\mathrm{MeV}} \left/ {{{c^2}}} \right.}}}}=\left( {3.1_{-0.8}^{+0.9 }{\,}_{-0.3}^{+0.2}\pm 0.2} \right)\times {10^{-7 }}, $ where the first error is statistical, the second is systematic, and the third comes from the uncertainties on the B 0 → J/ψ K ∗0 and J/ψ → e + e − branching fractions.eng
dc.format.extent18 p.cat
dc.language.isoengcat
dc.publisherSpringercat
dc.relation.ispartofJournal of High Energy Physics, 2013, Vol. 2013, No.5 (Maig)cat
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.otherPartícules (Física nuclear)cat
dc.titleMeasurement of the B 0 → K ∗0 e + e − branching fraction at low dilepton masscat
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/10.1007/JHEP05(2013)159cat


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