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 6.5 σ (3.5 σ) 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.

Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., et al. (2025). First Determination of the Spin-Parity of Ξc(3055)+,0 Baryons. PHYSICAL REVIEW LETTERS, 134(8), 1-13 [10.1103/physrevlett.134.081901].

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

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

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 6.5 σ (3.5 σ) 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.
2025
Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., et al. (2025). First Determination of the Spin-Parity of Ξc(3055)+,0 Baryons. PHYSICAL REVIEW LETTERS, 134(8), 1-13 [10.1103/physrevlett.134.081901].
Aaij, R.; Abdelmotteleb, A.  S.  W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1006957
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