The (Formula presented) decay chains are observed, and the spin-parity of (Formula presented) baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of (Formula presented), corresponding to an integrated luminosity of (Formula presented), recorded by the LHCb experiment between 2016 and 2018. The spin-parity of the (Formula presented) baryons is determined to be (Formula presented) with a significance of more than (Formula presented) ((Formula presented)) compared to all other tested hypotheses. The up-down asymmetries of the (Formula presented) transitions are measured to be (Formula presented) ((Formula presented)), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the (Formula presented) baryons correspond to the first (Formula presented)-wave (Formula presented)-mode excitation of the (Formula presented) flavor triplet. [(LHCb Collaboration]

First Determination of the Spin-Parity of Ξc(3055)+,0 Baryons / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 134:8(2025 Feb 28), pp. 081901.1-081901.13. [10.1103/physrevlett.134.081901]

First Determination of the Spin-Parity of Ξc(3055)+,0 Baryons

S. Cesare;P. Gandini;C. Mancuso;D. Marangotto;A. Merli;N. Neri;G. Tonani;Z. Wang;
2025

Abstract

The (Formula presented) decay chains are observed, and the spin-parity of (Formula presented) baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of (Formula presented), corresponding to an integrated luminosity of (Formula presented), recorded by the LHCb experiment between 2016 and 2018. The spin-parity of the (Formula presented) baryons is determined to be (Formula presented) with a significance of more than (Formula presented) ((Formula presented)) compared to all other tested hypotheses. The up-down asymmetries of the (Formula presented) transitions are measured to be (Formula presented) ((Formula presented)), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the (Formula presented) baryons correspond to the first (Formula presented)-wave (Formula presented)-mode excitation of the (Formula presented) flavor triplet. [(LHCb Collaboration]
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
28-feb-2025
Article (author)
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.134.081901.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Licenza: Creative commons
Dimensione 833.39 kB
Formato Adobe PDF
833.39 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

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/2434/1257939
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 4
  • OpenAlex ND
social impact