Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/20307
 Title: Study of excited $Λ_\mathrm{b}^0$ states decaying to $Λ_\mathrm{b}^0π^+π^-$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV Authors: Collaboration, CMS Keywords: hep-ex Issue Date: 2020 Publisher: Elsevier Abstract: 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. URI: http://bura.brunel.ac.uk/handle/2438/20307 ISSN: http://arxiv.org/abs/2001.06533v1http://arxiv.org/abs/2001.06533v1 Other Identifiers: http://arxiv.org/abs/2001.06533v1http://arxiv.org/abs/2001.06533v1 Appears in Collections: Dept of Mechanical Aerospace and Civil Engineering Research Papers

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