Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays
The decay-time-dependent CP asymmetry in Bs0→J/ψK+K- decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 1.9fb-1, collected with the LHCb detector at a centre-of-mass energy of 13TeV in 2015 and 2016. Using a sample of approximately 117 000 signal deca...
| Autores: | , , , , , , , , , , |
|---|---|
| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| 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:2445/162203 |
| Acesso em linha: | https://hdl.handle.net/2445/162203 |
| Access Level: | acceso abierto |
| Palavra-chave: | Física de partícules Violació CP (Física nuclear) Experiments Particle physics CP violation (Nuclear physics) |
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Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decaysAlfonso Albero, AlejandroCalvo Gómez, MíriamCamboni, AlessandroCoquereau, SamuelGarrido Beltrán, LluísGascón Fora, DavidGironella Gironell, P.Graciani Díaz, RicardoGraugés Pous, EugeniVilasis-Cardona, XavierLHCb CollaborationFísica de partículesViolació CP (Física nuclear)ExperimentsParticle physicsCP violation (Nuclear physics)ExperimentsThe decay-time-dependent CP asymmetry in Bs0→J/ψK+K- decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 1.9fb-1, collected with the LHCb detector at a centre-of-mass energy of 13TeV in 2015 and 2016. Using a sample of approximately 117 000 signal decays with an invariant K+K- mass in the vicinity of the ϕ(1020) resonance, the CP-violating phase ϕs is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the Bs0-B¯s0 system, Δ Γ s. The difference of the average Bs0 and B meson decay widths, Γ s- Γ d, is determined using in addition a sample of B→ J/ ψK+π- decays. The values obtained are ϕs=-0.083±0.041±0.006rad, ΔΓs=0.077±0.008±0.003ps-1 and Γs-Γd=-0.0041±0.0024±0.0015ps-1, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements of these quantities to date and are consistent with expectations based on the Standard Model and with a previous LHCb analysis of this decay using data recorded at centre-of-mass energies 7 and 8 TeV. Finally, the results are combined with recent results from Bs0→J/ψπ+π- decays obtained using the same dataset as this analysis, and with previous independent LHCb resultsSocietà Italiana di Fisica & Springer Verlag2020202020192020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion26 p.application/pdfhttps://hdl.handle.net/2445/162203Articles 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/10.1140/epjc/s10052-019-7159-8European Physical Journal C, 2019, vol. 79, num. 8, p. 706-706https://doi.org/10.1140/epjc/s10052-019-7159-8cc-by (c) Alfonso Albero, Alejandro et al., 2019http://creativecommons.org/licenses/by/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1622032026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays |
| title |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays |
| spellingShingle |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays Alfonso Albero, Alejandro Física de partícules Violació CP (Física nuclear) Experiments Particle physics CP violation (Nuclear physics) Experiments |
| title_short |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays |
| title_full |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays |
| title_fullStr |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays |
| title_full_unstemmed |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays |
| title_sort |
Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays |
| dc.creator.none.fl_str_mv |
Alfonso Albero, Alejandro Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, P. Graciani Díaz, Ricardo Graugés Pous, Eugeni Vilasis-Cardona, Xavier LHCb Collaboration |
| author |
Alfonso Albero, Alejandro |
| author_facet |
Alfonso Albero, Alejandro Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, P. Graciani Díaz, Ricardo Graugés Pous, Eugeni Vilasis-Cardona, Xavier LHCb Collaboration |
| author_role |
author |
| author2 |
Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, P. Graciani Díaz, Ricardo Graugés Pous, Eugeni Vilasis-Cardona, Xavier LHCb Collaboration |
| author2_role |
author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Física de partícules Violació CP (Física nuclear) Experiments Particle physics CP violation (Nuclear physics) Experiments |
| topic |
Física de partícules Violació CP (Física nuclear) Experiments Particle physics CP violation (Nuclear physics) Experiments |
| description |
The decay-time-dependent CP asymmetry in Bs0→J/ψK+K- decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 1.9fb-1, collected with the LHCb detector at a centre-of-mass energy of 13TeV in 2015 and 2016. Using a sample of approximately 117 000 signal decays with an invariant K+K- mass in the vicinity of the ϕ(1020) resonance, the CP-violating phase ϕs is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the Bs0-B¯s0 system, Δ Γ s. The difference of the average Bs0 and B meson decay widths, Γ s- Γ d, is determined using in addition a sample of B→ J/ ψK+π- decays. The values obtained are ϕs=-0.083±0.041±0.006rad, ΔΓs=0.077±0.008±0.003ps-1 and Γs-Γd=-0.0041±0.0024±0.0015ps-1, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements of these quantities to date and are consistent with expectations based on the Standard Model and with a previous LHCb analysis of this decay using data recorded at centre-of-mass energies 7 and 8 TeV. Finally, the results are combined with recent results from Bs0→J/ψπ+π- decays obtained using the same dataset as this analysis, and with previous independent LHCb results |
| publishDate |
2019 |
| dc.date.none.fl_str_mv |
2019 2020 2020 2020 |
| 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/2445/162203 |
| url |
https://hdl.handle.net/2445/162203 |
| 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/10.1140/epjc/s10052-019-7159-8 European Physical Journal C, 2019, vol. 79, num. 8, p. 706-706 https://doi.org/10.1140/epjc/s10052-019-7159-8 |
| dc.rights.none.fl_str_mv |
cc-by (c) Alfonso Albero, Alejandro et al., 2019 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
cc-by (c) Alfonso Albero, Alejandro et al., 2019 http://creativecommons.org/licenses/by/3.0/es |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
26 p. application/pdf |
| dc.publisher.none.fl_str_mv |
Società Italiana di Fisica & Springer Verlag |
| publisher.none.fl_str_mv |
Società Italiana di Fisica & 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) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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