Observation of a New Excited Beauty Strange Baryon Decaying to Ξb−π+π−
2021
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Authors
Sirunyan, A. M.Tumasyan, A.
Adam, W.
Andrejkovic, J. W.
Bergauer, T.
Adžić, Petar
Đorđević, Miloš
Milenović, Predrag
Milošević, Jovan
Milošević, Vukašin
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CMS CollaborationArticle (Published version)
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The Ξb−π+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 140 fb−1. The ground state Ξb− is reconstructed via its decays to J/ψΞ− and J/ψΛK−. A narrow resonance, labeled Ξb(6100)−, is observed at a Ξb−π+π− invariant mass of 6100.3±0.2(stat)±0.1(syst)±0.6(Ξb−) MeV, where the last uncertainty reflects the precision of the Ξb− 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 Ξb− baryon, with spin and parity quantum numbers JP=3/2−.
Source:
Physical Review Letters, 2021, 126Note:
- CMS Collaboration (ukupan broj autora: 2360)
DOI: 10.1103/PhysRevLett.126.252003
ISSN: 0031-9007
WoS: 000669051600004
Scopus: 2-s2.0-85108915377
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VinčaTY - JOUR AU - Sirunyan, A. M. AU - Tumasyan, A. AU - Adam, W. AU - Andrejkovic, J. W. AU - Bergauer, T. AU - Adžić, Petar AU - Đorđević, Miloš AU - Milenović, Predrag AU - Milošević, Jovan AU - Milošević, Vukašin PY - 2021 UR - https://vinar.vin.bg.ac.rs/handle/123456789/9867 AB - The Ξb−π+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 140 fb−1. The ground state Ξb− is reconstructed via its decays to J/ψΞ− and J/ψΛK−. A narrow resonance, labeled Ξb(6100)−, is observed at a Ξb−π+π− invariant mass of 6100.3±0.2(stat)±0.1(syst)±0.6(Ξb−) MeV, where the last uncertainty reflects the precision of the Ξb− 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 Ξb− baryon, with spin and parity quantum numbers JP=3/2−. T2 - Physical Review Letters T1 - Observation of a New Excited Beauty Strange Baryon Decaying to Ξb−π+π− VL - 126 DO - 10.1103/PhysRevLett.126.252003 ER -
@article{ author = "Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Andrejkovic, J. W. and Bergauer, T. and Adžić, Petar and Đorđević, Miloš and Milenović, Predrag and Milošević, Jovan and Milošević, Vukašin", year = "2021", abstract = "The Ξb−π+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 140 fb−1. The ground state Ξb− is reconstructed via its decays to J/ψΞ− and J/ψΛK−. A narrow resonance, labeled Ξb(6100)−, is observed at a Ξb−π+π− invariant mass of 6100.3±0.2(stat)±0.1(syst)±0.6(Ξb−) MeV, where the last uncertainty reflects the precision of the Ξb− 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 Ξb− baryon, with spin and parity quantum numbers JP=3/2−.", journal = "Physical Review Letters", title = "Observation of a New Excited Beauty Strange Baryon Decaying to Ξb−π+π−", volume = "126", doi = "10.1103/PhysRevLett.126.252003" }
Sirunyan, A. M., Tumasyan, A., Adam, W., Andrejkovic, J. W., Bergauer, T., Adžić, P., Đorđević, M., Milenović, P., Milošević, J.,& Milošević, V.. (2021). Observation of a New Excited Beauty Strange Baryon Decaying to Ξb−π+π−. in Physical Review Letters, 126. https://doi.org/10.1103/PhysRevLett.126.252003
Sirunyan AM, Tumasyan A, Adam W, Andrejkovic J, Bergauer T, Adžić P, Đorđević M, Milenović P, Milošević J, Milošević V. Observation of a New Excited Beauty Strange Baryon Decaying to Ξb−π+π−. in Physical Review Letters. 2021;126. doi:10.1103/PhysRevLett.126.252003 .
Sirunyan, A. M., Tumasyan, A., Adam, W., Andrejkovic, J. W., Bergauer, T., Adžić, Petar, Đorđević, Miloš, Milenović, Predrag, Milošević, Jovan, Milošević, Vukašin, "Observation of a New Excited Beauty Strange Baryon Decaying to Ξb−π+π−" in Physical Review Letters, 126 (2021), https://doi.org/10.1103/PhysRevLett.126.252003 . .