From samples of pp collision data collected by the LHCb experiment at √s=7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb-1, respectively, a peak in both the Λb0K- and Ξb0π- invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξb- resonances with quark content bds are expected. Referring to this peak as Ξb(6227)-, the mass and natural width are measured to be m(Ξb(6227)-) = 6226.9 ± 2.0 ± 0.3 ± 0.2 MeV/c2 and Γ(Ξb(6227)-) = 18.1 ± 5.4 ± 1.8 MeV/c2, where the first uncertainty is statistical, the second is systematic, and the third, on m(Ξb(6227)-), is due to the knowledge of the Λb0 baryon mass. Relative production rates of the Ξb(6227)-→Λb0K- and Ξb(6227)-→Ξb0π- decays are also reported.

Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Observation of a New Ξb- Resonance. PHYSICAL REVIEW LETTERS, 121(7), 072002 [10.1103/PhysRevLett.121.072002].

Observation of a New Ξb- Resonance

Belloli, N.;Borsato, M.;Calvi, M.;Carniti, P.;Cassina, L.;Fazzini, D.;Gotti, C.;Martinelli, M.;Matteuzzi, C.;Petruzzo, M.;
2018

Abstract

From samples of pp collision data collected by the LHCb experiment at √s=7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb-1, respectively, a peak in both the Λb0K- and Ξb0π- invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξb- resonances with quark content bds are expected. Referring to this peak as Ξb(6227)-, the mass and natural width are measured to be m(Ξb(6227)-) = 6226.9 ± 2.0 ± 0.3 ± 0.2 MeV/c2 and Γ(Ξb(6227)-) = 18.1 ± 5.4 ± 1.8 MeV/c2, where the first uncertainty is statistical, the second is systematic, and the third, on m(Ξb(6227)-), is due to the knowledge of the Λb0 baryon mass. Relative production rates of the Ξb(6227)-→Λb0K- and Ξb(6227)-→Ξb0π- decays are also reported.
Articolo in rivista - Articolo scientifico
Physics and Astronomy (all)
English
2018
121
7
072002
072002
none
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Observation of a New Ξb- Resonance. PHYSICAL REVIEW LETTERS, 121(7), 072002 [10.1103/PhysRevLett.121.072002].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/215449
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