Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π−
The Ξ_{b}^{-}π^{+}π^{-} invariant mass spectrum is investigated with an event sample of proton-proton collisions at sqrt[s]=13 TeV, collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 140 fb^{-1}. The ground state Ξ_{b}^{-} is reconstructed via...
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/142086 |
| _version_ | 1826200836133355520 |
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| author | Harris, Philip |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Harris, Philip |
| author_sort | Harris, Philip |
| collection | MIT |
| description | The Ξ_{b}^{-}π^{+}π^{-} invariant mass spectrum is investigated with an event sample of proton-proton collisions at sqrt[s]=13 TeV, collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 140 fb^{-1}. The ground state Ξ_{b}^{-} is reconstructed via its decays to J/ψΞ^{-} and J/ψΛK^{-}. A narrow resonance, labeled Ξ_{b}(6100)^{-}, is observed at a Ξ_{b}^{-}π^{+}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 Ξ_{b}(6100)^{-} natural width is determined to be 1.9 MeV at 95% confidence level. The low Ξ_{b}(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 Ξ_{c} baryon states, the new Ξ_{b}(6100)^{-} resonance and its decay sequence are consistent with the orbitally excited Ξ_{b}^{-} baryon, with spin and parity quantum numbers J^{P}=3/2^{-}. |
| first_indexed | 2024-09-23T11:42:32Z |
| format | Article |
| id | mit-1721.1/142086 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:42:32Z |
| publishDate | 2022 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1420862023-12-21T22:06:08Z Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π− Harris, Philip Massachusetts Institute of Technology. Department of Physics The Ξ_{b}^{-}π^{+}π^{-} invariant mass spectrum is investigated with an event sample of proton-proton collisions at sqrt[s]=13 TeV, collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 140 fb^{-1}. The ground state Ξ_{b}^{-} is reconstructed via its decays to J/ψΞ^{-} and J/ψΛK^{-}. A narrow resonance, labeled Ξ_{b}(6100)^{-}, is observed at a Ξ_{b}^{-}π^{+}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 Ξ_{b}(6100)^{-} natural width is determined to be 1.9 MeV at 95% confidence level. The low Ξ_{b}(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 Ξ_{c} baryon states, the new Ξ_{b}(6100)^{-} resonance and its decay sequence are consistent with the orbitally excited Ξ_{b}^{-} baryon, with spin and parity quantum numbers J^{P}=3/2^{-}. 2022-04-26T13:46:46Z 2022-04-26T13:46:46Z 2021 2022-04-26T13:42:28Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142086 Harris, Philip. 2021. "Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π−." Physical Review Letters, 126 (25). en 10.1103/PHYSREVLETT.126.252003 Physical Review Letters Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Physical Society (APS) APS |
| spellingShingle | Harris, Philip Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π− |
| title | Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π− |
| title_full | Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π− |
| title_fullStr | Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π− |
| title_full_unstemmed | Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π− |
| title_short | Observation of a New Excited Beauty Strange Baryon Decaying to Ξb− π+π− |
| title_sort | observation of a new excited beauty strange baryon decaying to ξb π π |
| url | https://hdl.handle.net/1721.1/142086 |
| work_keys_str_mv | AT harrisphilip observationofanewexcitedbeautystrangebaryondecayingtoxbpp |