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Study of excited $Λ_\mathrm{b}^0$ states decaying to $Λ_\mathrm{b}^0π^+π^-$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV

Journal Contribution - Journal Article

A study of excited $\Lambda_\mathrm{b}^0$ baryons is reported, based on a data sample collected in 2016-2018 with the CMS detector at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of up to 140 fb$^{-1}$. The existence of four excited $\Lambda_\mathrm{b}^0$ states: $\Lambda_\mathrm{b}$(5912)$^0$, $\Lambda_\mathrm{b}$(5920)$^0$, $\Lambda_\mathrm{b}$(6146)$^0$, and $\Lambda_\mathrm{b}$(6152)$^0$ in the $\Lambda_\mathrm{b}^0\pi^+\pi^-$ mass spectrum is confirmed, and their masses are measured. The $\Lambda_\mathrm{b}^0\pi^+\pi^-$ mass distribution exhibits a broad excess of events in the region of 6040-6100 MeV, whose origin cannot be discerned with the present data.
Journal: Phys.Lett.B
ISSN: 0370-2693
Volume: 803
Number of pages: 22
Publication year:2020
Keywords:hep-ex
  • Scopus Id: 85081618676
  • ORCID: /0000-0002-7366-7098/work/75206569
  • ORCID: /0000-0002-9598-6241/work/75206786
  • ORCID: /0000-0002-8564-8732/work/75207109
  • DOI: https://doi.org/10.1016/j.physletb.2020.135345
  • ORCID: /0000-0002-6792-9522/work/79142722
  • ArticleNumber: 134345