Szczegóły publikacji
Opis bibliograficzny
Observation of the rare baryonic decay $B^+ \to p\bar{\Lambda}$ and measurement of its weak decay parameter / R. Aaij, [et al.], S. BASHIR, [et al.], M. FIRLEJ, [et al.], T. FIUTOWSKI, [et al.], W. GOMUŁKA, [et al.], S. HASHMI, [et al.], M. IDZIK, [et al.], K. KALECIŃSKA, [et al.], J. MOROŃ, [et al.], A. OBŁĄKOWSKA-MUCHA, [et al.], K. M. SOWA, [et al.], K. ŚWIENTEK, [et al.], T. SZUMLAK, [et al.], A. UKLEJA, [et al.] // Physical Review Letters ; ISSN 0031-9007 . — 2026 — vol. 136 vol. 5-6 art. no. 051802, s. 051802-1–051802-14. — Bibliogr. s. 051802-6–051802-7, Abstr. — Publikacja dostępna online od: 2026-02-06
Autorzy (1212)
Dane bibliometryczne
| ID BaDAP | 166052 |
|---|---|
| Data dodania do BaDAP | 2026-03-10 |
| Tekst źródłowy | URL |
| DOI | 10.1103/fj4q-t8jg |
| Rok publikacji | 2026 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
The first observation of the decay 𝐵+→𝑝 is presented using proton-proton collision data collected by the LHCb experiment between 2016 and 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The signal significance exceeds seven standard deviations. Using the 𝐵+ →𝐾0 S𝜋+ decay as a normalization channel, the branching fraction is measured and combined with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012, yielding ℬ(𝐵+→𝑝¯Λ)=(1.24±0.17±0.05±0.03)×10−7, where the first uncertainty is statistical, the second is systematic, and the third comes from the uncertainty on the branching fraction of the normalization channel. The 𝐵+→𝑝¯Λweak decay parameter is measured to be 𝛼𝐵=0.87+0.26−0.29±0.09, indicating the presence of comparable S-wave and P-wave decay amplitudes.
