A search for the charmless baryonic decay B+→Λ¯pp¯p 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/ψK+, with J/ψ→Λ¯pK-. The branching fraction is measured to be B(B+→Λ¯pp¯p)=(2.15±0.35±0.12±0.28)×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 ACP=(5.4±15.6±2.4)%, where the uncertainties are statistical and systematic. The background-subtracted invariant-mass distributions of Λ¯p and p¯p pairs exhibit pronounced enhancements at both kinematic thresholds, in contrast to a uniform phase-space distribution.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). First Observation of the Charmless Baryonic Decay B+ → Λ ¯ p p ¯ p. PHYSICAL REVIEW LETTERS, 135(26) [10.1103/3pcs-dxtn].

First Observation of the Charmless Baryonic Decay B+ → Λ ¯ p p ¯ p

Anelli A.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;
2025

Abstract

A search for the charmless baryonic decay B+→Λ¯pp¯p 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/ψK+, with J/ψ→Λ¯pK-. The branching fraction is measured to be B(B+→Λ¯pp¯p)=(2.15±0.35±0.12±0.28)×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 ACP=(5.4±15.6±2.4)%, where the uncertainties are statistical and systematic. The background-subtracted invariant-mass distributions of Λ¯p and p¯p pairs exhibit pronounced enhancements at both kinematic thresholds, in contrast to a uniform phase-space distribution.
Articolo in rivista - Articolo scientifico
Decay; Hadrons
English
22-dic-2025
2025
135
26
261901
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). First Observation of the Charmless Baryonic Decay B+ → Λ ¯ p p ¯ p. PHYSICAL REVIEW LETTERS, 135(26) [10.1103/3pcs-dxtn].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/591261
Citazioni
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
Social impact