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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/2001.06533v1 http://arxiv.org/abs/2001.06533v1 |
Other Identifiers: | http://arxiv.org/abs/2001.06533v1 http://arxiv.org/abs/2001.06533v1 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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