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Author  |
LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Lucio Martinez, M.; Martinez-Vidal, F.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Svintozelskyi, V.; Velilla Serna, J.; Zhuo, J. |
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Title |
Updated measurement of CP violation and polarisation in Bs0 → J/ψ(K)over-bar*(892)0 decays |
Type |
Journal Article |
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Year |
2025 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
10 |
Issue |
10 |
Pages |
173 - 35pp |
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Keywords |
B Physics; CP Violation; Hadron-Hadron Scattering; Polarization |
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Abstract |
A time-integrated angular analysis of the decay B-s(0)-> J/psi(K) over bar*(892)(0), with J/psi -> mu(+)mu(-) and (K) over bar*(892)(0) -> K- pi(+), is presented. The analysis employs a sample of proton-proton collision data collected by the LHCb experiment during 2015-2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb(-1). A simultaneous maximum-likelihood fit is performed to the angular distributions in bins of the K-pi(+) mass. This fit yields measurements of the CP-averaged polarisation fractions and CP asymmetries for the P-wave component of the K-pi(+) system. The longitudinal and parallel polarisation fractions are determined to be f(0) = 0.534 +/- 0.012 +/- 0.009 and f(parallel to) = 0.211 +/- 0.014 +/- 0.005, respectively, where the first uncertainty is statistical and the second is systematic. The CP asymmetries are measured with 3-7% precision and are found to be consistent with zero. These measurements, along with an updated determination of the branching fraction relative to the B-0 -> J/psi K*(0) decay, are combined with previous LHCb results, providing the most precise values for these observables to date. |
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Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Song, R.; Walton, E. J.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia |
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Publisher |
Springer |
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Language |
English |
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Notes |
WOS:001638263400001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7087 |
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