Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays
The differential branching fraction of the rare decay Λ 0 b → Λµ+µ − is measured as a function of q 2 , 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. Evi...
| Autores: | , , , , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | España |
| Recursos: | 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:2445/185666 |
| Acesso em linha: | https://hdl.handle.net/2445/185666 |
| Access Level: | acceso abierto |
| Palavra-chave: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Large Hadron Collider (France and Switzerland) Particle physics |
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Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decaysLHCb collaborationBadalov, AlexeyCasanova Mohr, RaimonGarrido Beltrán, LluísGascón Fora, DavidGraciani Díaz, RicardoGraugés Pous, EugeniMarin Benito, CarlaPicatoste Olloqui, EduardoRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)HadronsGran Col·lisionador d'HadronsFísica de partículesExperimentsHadronsLarge Hadron Collider (France and Switzerland)Particle physicsExperimentsThe differential branching fraction of the rare decay Λ 0 b → Λµ+µ − is measured as a function of q 2 , 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 q 2 region below the square of the J/ψ mass. Integrating over 15 < q2 < 20 GeV2/c4 the branching fraction is measured as dB(Λ 0 b → Λµ+µ −)/dq 2 = (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/ψ Λ, respectively. In the q 2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A` FB) and hadron (Ah FB) systems are measured for the first time. In the range 15 < q2 < 20 GeV2/c4 they are found to be A ` FB = −0.05 ± 0.09 (stat) ± 0.03 (syst) and A h FB = −0.29 ± 0.07 (stat) ± 0.03 (syst).Springer Verlag2022202220152022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion33 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/185666Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1007/JHEP06(2015)115Journal of High Energy Physics, 2015, vol. 2015, num. 115, p. 1-33https://doi.org/10.1007/JHEP06(2015)115cc-by (c) LHCb collaboration et al., 2015https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1856662026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays |
| title |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays |
| spellingShingle |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays LHCb collaboration Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
| title_short |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays |
| title_full |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays |
| title_fullStr |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays |
| title_full_unstemmed |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays |
| title_sort |
Differential branching fraction and angular analysis of Λ {/b 0} → Λμ + μ - decays |
| dc.creator.none.fl_str_mv |
LHCb collaboration Badalov, Alexey Casanova Mohr, Raimon Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) |
| author |
LHCb collaboration |
| author_facet |
LHCb collaboration Badalov, Alexey Casanova Mohr, Raimon Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) |
| author_role |
author |
| author2 |
Badalov, Alexey Casanova Mohr, Raimon Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) |
| author2_role |
author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
| topic |
Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
| description |
The differential branching fraction of the rare decay Λ 0 b → Λµ+µ − is measured as a function of q 2 , 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 q 2 region below the square of the J/ψ mass. Integrating over 15 < q2 < 20 GeV2/c4 the branching fraction is measured as dB(Λ 0 b → Λµ+µ −)/dq 2 = (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/ψ Λ, respectively. In the q 2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A` FB) and hadron (Ah FB) systems are measured for the first time. In the range 15 < q2 < 20 GeV2/c4 they are found to be A ` FB = −0.05 ± 0.09 (stat) ± 0.03 (syst) and A h FB = −0.29 ± 0.07 (stat) ± 0.03 (syst). |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2015 2022 2022 2022 |
| 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 |
https://hdl.handle.net/2445/185666 |
| url |
https://hdl.handle.net/2445/185666 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció del document publicat a: https://doi.org/10.1007/JHEP06(2015)115 Journal of High Energy Physics, 2015, vol. 2015, num. 115, p. 1-33 https://doi.org/10.1007/JHEP06(2015)115 |
| dc.rights.none.fl_str_mv |
cc-by (c) LHCb collaboration et al., 2015 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
cc-by (c) LHCb collaboration et al., 2015 https://creativecommons.org/licenses/by/4.0/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
33 p. application/pdf application/pdf |
| dc.publisher.none.fl_str_mv |
Springer Verlag |
| publisher.none.fl_str_mv |
Springer Verlag |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Física Quàntica i Astrofísica) 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 |
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Recercat. Dipósit de la Recerca de Catalunya |
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15.812429 |