期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.252003
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- BMBWF (Austria)
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- Marie Curie program
- European Research Council and Horizon 2020 Grant [675440, 724704, 752730, 765710]
- Leventis Foundation
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- Belgian Federal Science Policy Office
- Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium)
- F. R. S.-FNRS and FWO (Belgium) under the Excellence of Science-EOS-be.h [30820817]
- Beijing Municipal Science & Technology Commission [Z191100007219010]
- Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
- Deutsche Forschungsgemeinschaft (DFG), under Germany's Excellence Strategy-EXC 2121 Quantum Universe [390833306, 400140256-GRK2497]
- Lendulet (Momentum) Program
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences (Hungary)
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- NKFIA (Hungary) [123842, 123959, 124845, 124850, 125105, 128713, 128786, 129058]
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- European Union (Poland)
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- National Science Center (Poland) [Harmonia 2014/14/M/ST2/00428, Opus 2014/13/B/ST2/02543, 2014/15/B/ST2/03998, 2015/19/B/ST2/02861, Sonata-bis 2012/07/E/ST2/01406]
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- Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu [MDM-2015-0509]
- Programa Severo Ochoa del Principado de Asturias
- Thalis and Aristeia programs - EU-ESF
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- Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
- Kavli Foundation
- Nvidia Corporation
- SuperMicro Corporation
- Welch Foundation [C-1845]
- Weston Havens Foundation (USA)
The study investigates the Xi(-)(b)pi(+)pi(-) invariant mass spectrum using proton-proton collision data at root s = 13 TeV collected by the CMS experiment at the LHC. A narrow resonance Xi(b)(6100)(-) is observed, indicating it may be an orbitally excited Xi(-)(b) baryon with spin and parity quantum numbers J(P) = 3/2(-), although quantum numbers cannot be directly measured due to low signal yield.
The Xi(-)(b)pi(+)pi(-) invariant mass spectrum is investigated with an event sample of proton-proton collisions at root 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 Xi(-)(b) is reconstructed via its decays to J/psi Xi(-) and J/psi Lambda K-. A narrow resonance, labeled Xi(b)(6100)(-), is observed at a Xi(-)(b)pi(+)pi(-) invariant mass of 6100.3 +/- 0.2(stat) +/- 0.1(syst) +/- 0.6(Xi(-)(b)) MeV, where the last uncertainty reflects the precision of the Xi(-)(b) baryon mass. The upper limit on the Xi(b)(6100)(-) natural width is determined to be 1.9 MeV at 95% confidence level. The low Xi(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 Xi(c) baryon states, the new Xi(b)(6100)(-) resonance and its decay sequence are consistent with the orbitally excited Xi(- )(b)baryon, with spin and parity quantum numbers J(P) = 3/2(-).
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