First observation of excited $\Omega_b^-$ states

Aaij, Roel; Abellán Beteta, Carlos; Ackernley, Thomas; Adeva, Bernardo; Adinolfi, Marco; Afsharnia, Hossein; Aidala, Christine Angela; Aiola, Salvatore; Ajaltouni, Ziad; Akar, Simon

doi:10.1103/PhysRevLett.124.082002

First observation of excited $\Omega_b^-$ states

LHCb

Collaboration

Jan 3, 2020

12 pages

Published in:

Phys.Rev.Lett. 124 (2020) 8, 082002

Published: Feb 26, 2020

e-Print:

2001.00851 [hep-ex]

DOI:

10.1103/PhysRevLett.124.082002 (publication)

PDG:

{{\mathit \Omega}_{{{b}}}{(6316)}^{-}}

\rightarrow

{{\mathit \Xi}_{{{b}}}^{0}}{{\mathit K}^{-}}

Report number:

LHCb-PAPER-2019-042,
CERN-EP-2019-278

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (APS)

We report four narrow peaks in the Ξb0K- mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb-1 recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ωb(6316)-]=6315.64±0.31±0.07±0.50 MeV, m[Ωb(6330)-]=6330.30±0.28±0.07±0.50 MeV, m[Ωb(6340)-]=6339.71±0.26±0.05±0.50 MeV, m[Ωb(6350)-]=6349.88±0.35±0.05±0.50 MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξb0 mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be Γ[Ωb(6316)-]<2.8 MeV, Γ[Ωb(6330)-]<3.1 MeV and Γ[Ωb(6340)-]<1.5 MeV. The natural width of the Ωb(6350)- peak is 1.4-0.8+1.0±0.1 MeV, which is 2.5σ from zero and corresponds to an upper limit of 2.8 MeV. The peaks have local significances ranging from 3.6σ to 7.2σ. After accounting for the look-elsewhere effect, the significances of the Ωb(6316)- and Ωb(6330)- peaks are reduced to 2.1σ and 2.6σ, respectively, while the two higher mass peaks exceed 5σ. The observed peaks are consistent with expectations for excited Ωb- resonances.

Note:

2 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-042.html

Elementary Particles and Fields
p p: scattering
p p: colliding beams
mass spectrum: (Xi/b0 K-)
Xi/b0
mass: width
mass: measured
Omega/b: excited state
bottom baryon: mass
bottom baryon: width

References(79)

Figures(5)

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