# 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.
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Journal articles

https://hal.archives-ouvertes.fr/hal-01815137
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Submitted on : Wednesday, June 13, 2018 - 6:42:47 PM
Last modification on : Wednesday, April 24, 2019 - 4:33:33 PM

### 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⟩

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