Szczegóły publikacji
Opis bibliograficzny
First determination of the spin-parity of $\Xi_{c} (3055)^{+,0}$ Baryons / R. Aaij, [et al.], S. BASHIR, [et al.], S. HASHMI, [et al.], P. KOPCIEWICZ, [et al.], M. W. MAJEWSKI, [et al.], A. OBŁĄKOWSKA-MUCHA, [et al.], J. RYŻKA, [et al.], T. SZUMLAK, [et al.], A. UKLEJA, [et al.] // Physical Review Letters ; ISSN 0031-9007. — 2025 — vol. 134 art. no. 081901, s. 081901-1-081901-13. — Bibliogr. s. 081901-6-081901-7, Abstr. — Publikacja dostępna online od: 2025-02-28. — P. Kopciewicz - dod. afiliacja: European Organization for Nuclear Research (CERN), Geneva, Switzerland
Autorzy (1137)
Dane bibliometryczne
| ID BaDAP | 158991 |
|---|---|
| Data dodania do BaDAP | 2025-04-11 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevLett.134.081901 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp | |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
The Ξ0(−)𝑏→Ξ𝑐(3055)+(0)(→𝐷+(0)Λ)𝜋− decay chains are observed, and the spin-parity of Ξ𝑐(3055)+(0) baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of √𝑠 =13 TeV, corresponding to an integrated luminosity of 5.4 fb−1, recorded by the LHCb experiment between 2016 and 2018. The spin-parity of the Ξ𝑐(3055)+(0) baryons is determined to be 3/2+ with a significance of more than 6.5𝜎 (3.5𝜎) compared to all other tested hypotheses. The up-down asymmetries of the Ξ0(−) 𝑏→Ξ𝑐(3055)+(0)𝜋− transitions are measured to be −0.92±0.10±0.05 (−0.92±0.16±0.22), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the Ξ𝑐(3055)+(0) baryons correspond to the first 𝐷-wave 𝜆-mode excitation of the Ξ𝑐 flavor triplet.