We report the first observation of a baryonic B0s decay, B0s → pΛ¯ K−, using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1. The branching fraction is measured to be BðB0s → pΛ¯ K−Þ þ BðB0s → p¯ΛKþÞ ¼½5.46 0.61 0.57 0.50ðBÞ 0.32ðfs=fdÞ × 10−6, where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the B0 → pΛ¯ π− decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of b-quark hadronization probabilities fs=fd.

First Observation of a Baryonic Bs0 Decay / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 119:4(2017). [10.1103/PhysRevLett.119.041802]

First Observation of a Baryonic Bs0 Decay

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2017

Abstract

We report the first observation of a baryonic B0s decay, B0s → pΛ¯ K−, using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1. The branching fraction is measured to be BðB0s → pΛ¯ K−Þ þ BðB0s → p¯ΛKþÞ ¼½5.46 0.61 0.57 0.50ðBÞ 0.32ðfs=fdÞ × 10−6, where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the B0 → pΛ¯ π− decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of b-quark hadronization probabilities fs=fd.
2017
B physics, first observation, fsfd
01 Pubblicazione su rivista::01a Articolo in rivista
First Observation of a Baryonic Bs0 Decay / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 119:4(2017). [10.1103/PhysRevLett.119.041802]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074294
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