Publication: Observation of a New Excited Beauty Strange Baryon Decaying to Ξb- π+π-
Дата
2021
Авторы
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Andrejkovic, J. W.
Matveev, V.
Chistov, R.
Danilov, M.
Oskin, A.
Parygin, P.
Polikarpov, S.
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Аннотация
© 2021 CERN.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-.
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Observation of a New Excited Beauty Strange Baryon Decaying to Ξb- π+π- / Sirunyan, A.M. [et al.] // Physical Review Letters. - 2021. - 126. - № 25. - 10.1103/PhysRevLett.126.252003
URI
https://www.doi.org/10.1103/PhysRevLett.126.252003
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https://openrepository.mephi.ru/handle/123456789/24312
https://www.scopus.com/record/display.uri?eid=2-s2.0-85108915377&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000669051600004
https://openrepository.mephi.ru/handle/123456789/24312