The Λ+cK− 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 Ξ0c 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 Λ+c 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.

Observation of New Ξc0 Baryons Decaying to Λc+ K- / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 124:22(2020). [10.1103/PhysRevLett.124.222001]

Observation of New Ξc0 Baryons Decaying to Λc+ K-

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2020

Abstract

The Λ+cK− 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 Ξ0c 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 Λ+c 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
Branching Ratios; Baryon measurements; Flavour Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of New Ξc0 Baryons Decaying to Λc+ K- / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 124:22(2020). [10.1103/PhysRevLett.124.222001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1466328
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