# Observation of a new $\Xi_b^-$ resonance

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 mΞb(6227)-=6226.9±2.0±0.3±0.2  MeV/c2 and ΓΞb(6227)-=18.1±5.4±1.8  MeV/c2, where the first uncertainty is statistical, the second is systematic, and the third, on mΞb(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.
Keywords :
Type de document :
Article dans une revue
Phys.Rev.Lett., 2018, 121 (7), pp.072002. 〈10.1103/PhysRevLett.121.072002〉

https://hal.archives-ouvertes.fr/hal-01815137
Contributeur : Inspire Hep <>
Soumis le : mercredi 13 juin 2018 - 18:42:47
Dernière modification le : mercredi 13 février 2019 - 14:40:19

### Citation

Roel Aaij, Bernardo Adeva, Marco Adinolfi, Christine Angela Aidala, Ziad Ajaltouni, et al.. Observation of a new $\Xi_b^-$ resonance. Phys.Rev.Lett., 2018, 121 (7), pp.072002. 〈10.1103/PhysRevLett.121.072002〉. 〈hal-01815137〉

### Métriques

Consultations de la notice