Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays
The 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. Eviden...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:20.500.14342/3137 |
| Acceso en línea: | http://hdl.handle.net/20.500.14342/3137 https://doi.org/10.1007/JHEP06(2015)115 |
| Access Level: | acceso abierto |
| Palabra clave: | Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) Protons 539 |
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Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decaysBadalov, AlexeyCalvo Gomez, MiriamVilasis-Cardona, XavierLHCb Collaboration - CERNGran col·lisionador d'hadrons (França i Suïssa)Partícules (Física nuclear)Col·lisions (Física nuclear)Protons539The 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).SpringerUniversitat Ramon Llull. La SalleCERN2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion29 p.http://hdl.handle.net/20.500.14342/3137https://doi.org/10.1007/JHEP06(2015)115reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésJournal of High Energy Physics, 2015, Vol. 2015, No.115 (Juny)Attribution 4.0 International© CERNhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:20.500.14342/31372026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays |
| title |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays |
| spellingShingle |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays Badalov, Alexey Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) Protons 539 |
| title_short |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays |
| title_full |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays |
| title_fullStr |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays |
| title_full_unstemmed |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays |
| title_sort |
Differential branching fraction and angular analysis of Λ 0 b → Λμ+μ− decays |
| dc.creator.none.fl_str_mv |
Badalov, Alexey Calvo Gomez, Miriam Vilasis-Cardona, Xavier LHCb Collaboration - CERN |
| author |
Badalov, Alexey |
| author_facet |
Badalov, Alexey Calvo Gomez, Miriam Vilasis-Cardona, Xavier LHCb Collaboration - CERN |
| author_role |
author |
| author2 |
Calvo Gomez, Miriam Vilasis-Cardona, Xavier LHCb Collaboration - CERN |
| author2_role |
author author author |
| dc.contributor.none.fl_str_mv |
Universitat Ramon Llull. La Salle CERN |
| dc.subject.none.fl_str_mv |
Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) Protons 539 |
| topic |
Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) Protons 539 |
| description |
The 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). |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2015 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/20.500.14342/3137 https://doi.org/10.1007/JHEP06(2015)115 |
| url |
http://hdl.handle.net/20.500.14342/3137 https://doi.org/10.1007/JHEP06(2015)115 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Journal of High Energy Physics, 2015, Vol. 2015, No.115 (Juny) |
| dc.rights.none.fl_str_mv |
Attribution 4.0 International © CERN http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
Attribution 4.0 International © CERN http://creativecommons.org/licenses/by/4.0/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
29 p. |
| dc.publisher.none.fl_str_mv |
Springer |
| publisher.none.fl_str_mv |
Springer |
| dc.source.none.fl_str_mv |
reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| instname_str |
Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| reponame_str |
Recercat. Dipósit de la Recerca de Catalunya |
| collection |
Recercat. Dipósit de la Recerca de Catalunya |
| repository.name.fl_str_mv |
|
| repository.mail.fl_str_mv |
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1869423210042228736 |
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15,81155 |