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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 |
First Observation of the Charmless Baryonic Decay B+ → (Λ)over-barp(p)over-barp |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
135 |
Issue |
26 |
Pages |
261901 - 14pp |
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Abstract |
A search for the charmless baryonic decay B+ -> (Lambda) over barp (p) over barp is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb(-1). The branching fraction for this decay is measured for the first time relative to that of the topologically similar decay B+ -> J/psi K+, with J/psi -> (Lambda) over bar pK(-). The branching fraction is measured to be B(B+ -> (Lambda) over barp (p) over barp) = (2.15 +/- 0.35 +/- 0.12 +/- 0.28) x 10(-7), where the first uncertainty is statistical, the second is systematic, and the third arises from the uncertainty in the normalization channel branching fraction. The CP asymmetry is measured to be A(CP) = (5.4 +/- 15.6 +/- 2.4)%, where the uncertainties are statistical and systematic. The background-subtracted invariant-mass distributions of (Lambda) over barp and (p) over barp pairs exhibit pronounced enhancements at both kinematic thresholds, in contrast to a uniform phase-space distribution. |
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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 |
Amer Physical Soc |
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Language |
English |
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Original Title |
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Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0031-9007 |
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Notes |
WOS:001672308600001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7125 |
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