Spectroscopy of doubly-heavy baryons at LHCb
M. Traill* on behalf of the LHCb collaboration
Pre-published on:
February 16, 2018
Published on:
March 20, 2018
Abstract
The LHCb detector is ideally designed for studies in hadron spectroscopy. Its capabilities in this area of physics was firmly demonstrated when LHCb announced the discovery of the first ever doubly heavy baryon, Ξ++cc, in decays of Ξ++cc→Λ+cK−π+π+ in 2017. This doubly charmed baryon was observed as a highly significant structure in the Λ+cK−π+π+ mass spectrum from proton-proton collision data recorded by the LHCb detector at both 13~TeV and 8~TeV centre-of-mass energies. From the 13~TeV and 8~TeV samples, a yield of 313 ± 33 and 113 ± 21 Ξ++cc candidates are measured respectively. The local significances is in excess of 12σ in 13~TeV data and above 7σ in 8~TeV data. The properties of the peak suggest it is inconsistent with being a strongly decaying state. From the 13~TeV data, the mass is measured to be 3621.40± 0.72(stat.)± 0.27(syst.)± 0.14(Λ+c) MeV/c2. More analyses in the double heavy baryon sector using LHCb data are now well advanced. This includes, but is not limited to, searches for the singly charged Ξ+cc state and also charmed-beauty Ξbc baryons.
DOI: https://doi.org/10.22323/1.310.0067
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