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dc.contributorUniversitat Ramon Llull. La Salle
dc.contributorCERN
dc.contributor.authorBadalov, Alexey
dc.contributor.authorCalvo Gómez, Míriam
dc.contributor.authorVilasís Cardona, Xavier
dc.contributor.authorLHCb Collaboration - CERN
dc.date.accessioned2020-11-20T07:40:37Z
dc.date.accessioned2023-10-02T06:26:31Z
dc.date.available2020-11-20T07:40:37Z
dc.date.available2023-10-02T06:26:31Z
dc.date.created2015
dc.date.issued2015-06-17
dc.identifier.urihttp://hdl.handle.net/20.500.14342/3137
dc.description.abstractThe differential branching fraction of the rare decay Λ 0 b  → Λμ+μ− is measured as a function of q2, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. Evidence of signal is observed in the q2 region below the square of the J/ψ mass. Integrating over 15 < q2 < 20 GeV2/c4 the differential branching fraction is measured as dB(Λ0b→Λμ+μ−)/dq2=(1.18+0.09−0.08±0.03±0.27)×10−7(GeV2/c4)−1, where the uncertainties are statistical, systematic and due to the normalisation mode, Λ 0 b  → J/ψΛ, respectively. In the q2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A ℓFB ) and hadron (A hFB ) systems are measured for the first time. In the range 15 < q2 < 20 GeV2/c4 they are found to be AℓFB=−0.05±0.09(stat)±0.03(syst)andAhFB=−0.29±0.07(stat)±0.03(syst).eng
dc.format.extent29 p.ca
dc.language.isoengca
dc.publisherSpringerca
dc.relation.ispartofJournal of High Energy Physics, 2015, Vol. 2015, No.115 (Juny)ca
dc.rightsAttribution 4.0 International
dc.rights© CERN
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)ca
dc.subject.otherPartícules (Física nuclear)ca
dc.subject.otherCol·lisions (Física nuclear)ca
dc.subject.otherProtonsca
dc.titleDifferential branching fraction and angular analysis of Λ 0 b  → Λμ+μ− decaysca
dc.typeinfo:eu-repo/semantics/articleca
dc.typeinfo:eu-repo/semantics/publishedVersionca
dc.rights.accessLevelinfo:eu-repo/semantics/openAccess
dc.embargo.termscapca
dc.subject.udc539
dc.identifier.doihttps://doi.org/10.1007/JHEP06(2015)115ca


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Attribution 4.0 International
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