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Observation of a new excited beauty strange baryon decaying to Xi(-)(b)π+π−

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  • Additional Information
    • Publication Date:
      2021
    • Collection:
      Ghent University Academic Bibliography
    • Abstract:
      The Xi(-)(b)pi(+)pi(-) invariant mass spectrum is investigated with an event sample of proton-proton collisions at root s = 13 TeV, collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 140 fb(-1). The ground state Xi(-)(b) is reconstructed via its decays to J/psi Xi(-) and J/psi Lambda K-. A narrow resonance, labeled Xi(b)(6100)(-), is observed at a Xi(-)(b)pi(+)pi(-) invariant mass of 6100.3 +/- 0.2(stat) +/- 0.1(syst) +/- 0.6(Xi(-)(b)) MeV, where the last uncertainty reflects the precision of the Xi(-)(b) baryon mass. The upper limit on the Xi(b)(6100)(-) natural width is determined to be 1.9 MeV at 95% confidence level. The low Xi(b)(6100)(-) signal yield observed in data does not allow a measurement of the quantum numbers of the new state. However, following analogies with the established excited Xi(c) baryon states, the new Xi(b)(6100)(-) resonance and its decay sequence are consistent with the orbitally excited Xi(- )(b)baryon, with spin and parity quantum numbers J(P) = 3/2(-).
    • File Description:
      application/pdf
    • Relation:
      https://biblio.ugent.be/publication/8754166; http://hdl.handle.net/1854/LU-8754166; http://dx.doi.org/10.1103/PhysRevLett.126.252003; https://biblio.ugent.be/publication/8754166/file/01GZEBA89TNH42QX2VQAVK61CB
    • Accession Number:
      10.1103/PhysRevLett.126.252003
    • Online Access:
      https://doi.org/10.1103/PhysRevLett.126.252003
      https://biblio.ugent.be/publication/8754166
      http://hdl.handle.net/1854/LU-8754166
      https://biblio.ugent.be/publication/8754166/file/01GZEBA89TNH42QX2VQAVK61CB
    • Rights:
      Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) ; info:eu-repo/semantics/openAccess
    • Accession Number:
      edsbas.87F55E5C