Por favor, use este identificador para citar o enlazar este documento: https://hdl.handle.net/2445/162203
Título: Updated measurement of time-dependent CP -violating observables in Bs0→J/ψK+K- decays
Autor: 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
Materia: Física de partícules
Violació CP (Física nuclear)
Experiments
Particle physics
CP violation (Nuclear physics)
Experiments
Fecha de publicación: 22-agoo-2019
Publicado por: Società Italiana di Fisica & Springer Verlag
Resumen: 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
Nota: Reproducció del document publicat a: https://doi.org/10.1140/epjc/s10052-019-7159-8
Es parte de: European Physical Journal C, 2019, vol. 79, num. 8, p. 706-706
URI: https://hdl.handle.net/2445/162203
Recurso relacionado: https://doi.org/10.1140/epjc/s10052-019-7159-8
ISSN: 1434-6044
Aparece en las colecciones:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Física Quàntica i Astrofísica)

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