Szczegóły publikacji
Opis bibliograficzny
TEST_AG_Observation of the Rare Baryonic Decay B+→pΛ and Measurement of its Weak Decay Parameter / Giza Maciej, Marcinek Antoni, Aaij Roel, Łokas Edyta // PHYSICAL REVIEW LETTERS. — 2025 — vol. 136(5), s. 051802.
Autorzy (7)
Dane bibliometryczne
| ID BaDAP | 282 |
|---|---|
| Typ publikacji | artykuł |
| Rok publikacji | 2025 |
| Otwarty dostęp |  |
Informacje o źródle
| Czasopismo/seria | PHYSICAL REVIEW LETTERS |
|---|---|
| Tom | 136 |
| Zeszyt | 5 |
| Strony lub numer artykułu | 051802 |
Abstract
The first observation of the decay B+→pΛ¯ 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+→KS0π+ 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+→pΛ¯)=(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+→pΛ¯ weak decay parameter is measured to be αB=0.87-0.29+0.26±0.09, indicating the presence of comparable S-wave and P-wave decay amplitudes.
