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Observation of a New Excited Beauty Strange Baryon Decaying to Xi(-)(b)pi(+)pi(-)

Abstract: The ??b ?þ?? invariant mass spectrum is investigated with an event sample of proton-proton collisions at ffiffiffi s p ¼ 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 ??b is reconstructed via its decays to J=??? and J=??K?. A narrow resonance, labeled ?bð6100Þ?, is observed at a ??b ?þ?? invariant mass of 6100.3  0.2ðstatÞ  0.1ðsystÞ  0.6ð??b Þ MeV, where the last uncertainty reflects the precision of the ??b baryon mass. The upper limit on the ?bð6100Þ? natural width is determined to be 1.9 MeV at 95% confidence level. The low ?bð6100Þ? 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 ?c baryon states, the new ?bð6100Þ? resonance and its decay sequence

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Phys. Rev. Lett. 126, 252003 (2021)

Editorial: American Physical Society

 Fecha de publicación: 25/06/2021

Nº de páginas: 19

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.126.252003

ISSN: 0031-9007,1079-7114

Url de la publicación: https://doi.org/10.1103/PhysRevLett.126.252003