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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 |
Differential decay rate of B+ → J/ψK+ with the LHCb Upgrade I experiment |
Type |
Journal Article |
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Year |
2026 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
04 |
Issue |
4 |
Pages |
170 - 30pp |
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Keywords |
B Physics; Flavour Physics; Hadron-Hadron Scattering; Rare Decay |
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Abstract |
The normalised decay rate of B+ -> J/psi(-> mu(+) mu(-))K+ is measured as a function of the lepton helicity angle using a data sample corresponding to an integrated luminosity of 1.1 fb(-1) collected during October 2024 with the upgraded (Upgrade I) LHCb detector. This angular distribution can be parameterised by two coefficients, the forward-backward asymmetry, A(FB), and the flatness parameter, F-H, whose values are constrained by conservation of angular momentum. These coefficients are measured both integrated and differentially across various kinematic and detector-response variables, and the results are found to be in good agreement with expectations. These measurements show that the detector response of the LHCb Upgrade I experiment is understood to the precision required to reliably extract the angular coefficients associated with rare b -> s mu(+) mu(-) and b -> d mu(+) mu(-) transitions, which are particularly sensitive to physics beyond the Standard Model. |
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Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. J.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia |
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Publisher |
Springer |
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English |
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Notes |
WOS:001756988500001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7236 |
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