Observation of a New Xi(-)(b) Resonance



Aaij, R, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F, Alexander, M
et al (show 802 more authors) (2018) Observation of a New Xi(-)(b) Resonance. PHYSICAL REVIEW LETTERS, 121 (7).

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Abstract

From samples ofppcollision data collected by the LHCb experiment atffiffiffisp¼7, 8 and 13 TeV,corresponding to integrated luminosities of 1.0, 2.0 and1.5fb−1, respectively, a peak in both theΛ0bK−andΞ0bπ−invariant mass spectra is observed. In the quark model, radially and orbitally excitedΞ−bresonances withquark contentbdsare expected. Referring to this peak asΞbð6227Þ−, the mass and natural width are measuredto bemΞbð6227Þ−¼6226.9 2.0 0.3 0.2MeV=c2andΓΞbð6227Þ−¼18.1 5.4 1.8MeV=c2, wherethe first uncertainty is statistical, the second is systematic, and the third, onmΞbð6227Þ−, is due to the knowledgeof theΛ0bbaryon mass. Relative production rates of theΞbð6227Þ−→Λ0bK−andΞbð6227Þ−→Ξ0bπ−decaysare also reported

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 03 Dec 2018 10:09
Last Modified: 06 Dec 2021 08:19
DOI: 10.1103/PhysRevLett.121.072002
Open Access URL: http://doi.org/10.1103/PhysRevLett.121.072002
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3029305