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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 |
Measurement of the branching fraction of the Λb0 → J/ψΛ decay and isospin asymmetry of B → J/ψK decays |
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 |
01 |
Issue |
1 |
Pages |
159 - 28pp |
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Keywords |
B Physics; Branching fraction; Flavour Physics; Hadron-Hadron Scattering |
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Abstract |
This paper describes a measurement of the Lambda(0)(b) -> J/psi Lambda branching fraction using data collected with the LHCb experiment in proton-proton collisions from 2016 to 2018. The dataset corresponds to an integrated luminosity of 5.4 fb(-1). The branching fraction is determined relative to that of B-0 -> J/psi K-S(0) decays, B(Lambda(0)(b) -> J/psi Lambda)/(B-0 -> J/psi K-S(0)) = 0.750 +/- 0.005 +/- 0.022 +/- 0.005 +/- 0.062, yielding B(Lambda(0)(b) -> J/psi Lambda) = (3.34 +/- 0.02 +/- 0.10 +/- 0.08 +/- 0.28) x 10(-4), where the first uncertainty is statistical, the second systematic, the third due to external inputs on branching fractions and the fourth due to the ratio of Lambda(0)(b) baryon and B-0 meson hadronisation fractions. In addition, the isospin asymmetry between the rates of B-0 -> J/psi K-S(0) and B+ -> J/psi K+ decays is measured to be A(I) = -0.0135 +/- 0.0004 +/- 0.0133, where the first uncertainty is statistical and the second systematic. |
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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, Australia, Email: lgarciam@cern.ch |
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Publisher |
Springer |
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Language |
English |
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Notes |
WOS:001679516500001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7089 |
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