Abstract: A study of B and Bs meson decays into J/ψ η and J/ψ η′ final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, collected by the LCHb experiment and corresponding to 3.0 fb−1 of integrated luminosity. The decay B0 → J/ψ η′ is observed for the first time. The following ratios of branching fractions are measured: (Formula Presented) where the third uncertainty is related to the present knowledge of fs/fd, the ratio between the probabilities for a b quark to form a Bs or a B0 meson. The branching fraction ratios are used to determine the parameters of η − η′ meson mixing. In addition, the first evidence for the decay Bs → ψ(2S)η′ is reported, and the relative branching fraction is measured, (Formula Presented) where the third uncertainty is due to the limited knowledge of the branching fractions of J/ψ and ψ(2S) mesons.

The LHCb collaboration, N., Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2015). Study of η − η′ mixing from measurement of B (s)0 → J/ψη(′) decay rates. JOURNAL OF HIGH ENERGY PHYSICS, 2015(1), 1-24 [10.1007/JHEP01(2015)024].

Study of η − η′ mixing from measurement of B (s)0 → J/ψη(′) decay rates

CALVI, MARTA;CASSINA, LORENZO;GOTTI, CLAUDIO;KHANJI, BASEM;Martinelli, M;MATTEUZZI, CLARA;
2015

Abstract

Abstract: A study of B and Bs meson decays into J/ψ η and J/ψ η′ final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, collected by the LCHb experiment and corresponding to 3.0 fb−1 of integrated luminosity. The decay B0 → J/ψ η′ is observed for the first time. The following ratios of branching fractions are measured: (Formula Presented) where the third uncertainty is related to the present knowledge of fs/fd, the ratio between the probabilities for a b quark to form a Bs or a B0 meson. The branching fraction ratios are used to determine the parameters of η − η′ meson mixing. In addition, the first evidence for the decay Bs → ψ(2S)η′ is reported, and the relative branching fraction is measured, (Formula Presented) where the third uncertainty is due to the limited knowledge of the branching fractions of J/ψ and ψ(2S) mesons.
Articolo in rivista - Articolo scientifico
B physics; Branching fraction; Hadron-Hadron Scattering; QCD; Spectroscopy; Nuclear and High Energy Physics
English
1
24
24
The LHCb collaboration, N., Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2015). Study of η − η′ mixing from measurement of B (s)0 → J/ψη(′) decay rates. JOURNAL OF HIGH ENERGY PHYSICS, 2015(1), 1-24 [10.1007/JHEP01(2015)024].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/154261
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