The Λc+ K− mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^−1 collected by the LHCb experiment. Three Ξc0 states are observed with a large significance and their masses and natural widths are measured to be m[Ξc(2923)0] = 2923.04 ± 0.25 ± 0.20 ± 0.14 MeV, Γ[Ξc(2923)0] = 7.1 ± 0.8 ± 1.8 MeV, m[Ξc(2939)0] = 2938.55 ± 0.21 ± 0.17 ± 0.14 MeV, Γ[Ξc(2939)0] = 10.2 ± 0.8 ± 1.1 MeV, m[Ξc(2965)0] = 2964.88 ± 0.26 ± 0.14 ± 0.14 MeV, Γ[Ξc(2965)0] = 14.1 ± 0.9 ± 1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λc+ mass. The Ξc(2923)0 and Ξc(2939)0 baryons are new states. The Ξc(2965)0 state is in the vicinity of the known Ξc(2970)0 baryon; however, their masses and natural widths differ significantly.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Observation of New Ξc0 Baryons Decaying to Λc+ K−. PHYSICAL REVIEW LETTERS, 124(22), 1-11 [10.1103/PhysRevLett.124.222001].

Observation of New Ξc0 Baryons Decaying to Λc+ K−

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Zucchelli, S.
2020

Abstract

The Λc+ K− mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^−1 collected by the LHCb experiment. Three Ξc0 states are observed with a large significance and their masses and natural widths are measured to be m[Ξc(2923)0] = 2923.04 ± 0.25 ± 0.20 ± 0.14 MeV, Γ[Ξc(2923)0] = 7.1 ± 0.8 ± 1.8 MeV, m[Ξc(2939)0] = 2938.55 ± 0.21 ± 0.17 ± 0.14 MeV, Γ[Ξc(2939)0] = 10.2 ± 0.8 ± 1.1 MeV, m[Ξc(2965)0] = 2964.88 ± 0.26 ± 0.14 ± 0.14 MeV, Γ[Ξc(2965)0] = 14.1 ± 0.9 ± 1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λc+ mass. The Ξc(2923)0 and Ξc(2939)0 baryons are new states. The Ξc(2965)0 state is in the vicinity of the known Ξc(2970)0 baryon; however, their masses and natural widths differ significantly.
2020
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Observation of New Ξc0 Baryons Decaying to Λc+ K−. PHYSICAL REVIEW LETTERS, 124(22), 1-11 [10.1103/PhysRevLett.124.222001].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/772381
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