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Title: | Observation of a New Excited Beauty Strange Baryon Decaying to Ξb−π+π− |
Authors: | CMS Collaboration Sirunyan, A. M. DUBE, SOURABH KANSAL, B. PANDEY, S. RANE, A. RASTOGI, A. SHARMA, SEEMA et al. Dept. of Physics |
Keywords: | Physics 2021-JUL-WEEK3 TOC-JUL-2021 2021 |
Issue Date: | Jun-2021 |
Publisher: | American Physical Society |
Citation: | Physical Review Letters, 126(25), 252003. |
Abstract: | The Ξ−bπ+π− invariant mass spectrum is investigated with an event sample of proton proton collisions at √s=13 TeV, collected by the CMS experiment at the LHC in 2016–2018 and corresponding to an integrated luminosity of 140fb−1. The ground state Ξ−b is reconstructed via its decays to J/ψΞ−and J/ψΛK−. A narrow resonance, labeled Ξb(6100)−, is observed at a Ξ −bπ+π−invariant mass of 6100.3±0.2(stat)±0.1(syst)±0.6(Ξ−b)MeV, where the last uncertainty reflects the precision of the Ξ−b baryon mass. The upper limit on the Ξb(6100)−natural width is determined to be 1.9 MeV at 95% confidence level. The low Ξb(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 Ξc baryon states, the new Ξb(6100)−resonance and its decay sequence are consistent with the orbitally excited Ξ−b baryon, with spin and parity quantum numbers JP=3/2−. |
URI: | http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/6095 https://doi.org/10.1103/PhysRevLett.126.252003 |
ISSN: | 1079-7114 0031-9007 |
Appears in Collections: | JOURNAL ARTICLES |
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