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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 |
Branching fraction measurement of the Λ → pμ- (v)over-barμ decay |
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 |
096 - 27pp |
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Keywords |
Branching fraction; Flavour Physics; Hadron-Hadron Scattering; Electroweak Interaction |
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Abstract |
A measurement of the branching fraction for the decay Lambda -> p mu(-) (v) over bar (mu) is presented using pp collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV. The analysis is based on data recorded between 2016 and 2018, corresponding to an integrated luminosity of 5.4 fb(-1). The result is obtained using Lambda -> p mu(-) decays as a normalisation channel. The measured branching fraction is B(Lambda -> p mu(-) (v) over bar (mu)) = (1.462 +/- 0.016 +/- 0.100 +/- 0.011) x 10(-4), where the uncertainties are statistical, systematic, and due to the limited knowledge of the normalisation mode branching fraction, respectively. This result improves the precision of the branching fraction measurement by a factor of two compared to the previous best measurement and sets a more stringent bound on lepton flavour universality in s -> u quark transitions. It is consistent with previous measurements, and the extracted lepton flavour universality test observable, R-mu e = Gamma(Lambda -> p mu(-)(v) over bar (mu))/Gamma(Lambda -> pe(-)(v) over bar (e)) = 0.175 +/- 0.012, agrees with the Standard Model prediction. |
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Address |
[Bonacci, R. B.; Torres, M. Cruz; 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.; 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:001751350300001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7222 |
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