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dc.contributor.authorLHCb Collaboration
dc.contributor.authorAdeva Andany, Bernardo
dc.contributor.authorDosil Suárez, Álvaro
dc.contributor.authorFernández Albor, Víctor Manuel
dc.contributor.authorGallas Torreira, Abraham Antonio
dc.contributor.authorGarcía Pardiñas, Julián
dc.contributor.authorHernando Morata, José Ángel
dc.contributor.authorPlo Casasus, Máximo
dc.contributor.authorRomero Vidal, Antonio
dc.contributor.authorSaborido Silva, Juan José
dc.contributor.authorSanmartín Sedes, Brais
dc.contributor.authorSantamarina Ríos, Cibrán
dc.contributor.authorVázquez Regueiro, Pablo
dc.contributor.authorVázquez Sierra, Carlos
dc.contributor.authorVieites Díaz, María
dc.date.accessioned2020-05-04T11:04:45Z
dc.date.available2020-05-04T11:04:45Z
dc.date.issued2015
dc.identifier.citationAaij, R., Adeva, B., Adinolfi, M. et al. Differential branching fraction and angular analysis of Λ 0b → Λμ+μ− decays. J. High Energ. Phys. 2015, 115 (2015). https://doi.org/10.1007/JHEP06(2015)115
dc.identifier.issn1029-8479
dc.identifier.urihttp://hdl.handle.net/10347/21984
dc.description.abstractThe differential branching fraction of the rare decay Λ 0b → 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 0b → 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).
dc.language.isoeng
dc.publisherSpringer
dc.rights© CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative CommonsAttribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectRare decay
dc.subjectHadron-Hadron Scattering
dc.subjectBranching fraction
dc.subjectB physics
dc.subjectFlavour Changing Neutral Currents
dc.titleDifferential branching fraction and angular analysis of Λ 0b → Λμ+μ− decays
dc.typeinfo:eu-repo/semantics/article
dc.identifier.DOI10.1007/JHEP06(2015)115
dc.relation.publisherversionhttps://doi.org/10.1007/JHEP06(2015)115
dc.type.versioninfo:eu-repo/semantics/publishedVersion
dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.contributor.affiliationUniversidade de Santiago de Compostela. Departamento de Física de Partículas
dc.contributor.affiliationUniversidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE)
dc.description.peerreviewedSI


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© CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative CommonsAttribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Except where otherwise noted, this item's license is described as  © CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative CommonsAttribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.





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