2018/07/05 by LHCb collaboration, R. Aaij, B. Adeva +835 · 1 voice
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1103/physrevlett.121.092003
published as Phys. Rev. Lett. 121, 092003 (2018) · 7 pages, 2 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-028.html
arxiv published 2018/07/05 · arxiv created 2018/08/31 · arxiv updated 2018/09/05
We report a measurement of the lifetime of the Ωc0 baryon using proton-proton collision data at center-of-mass energies of 7 and 8~TeV, corresponding to an integrated luminosity of 3.0 fb-1 collected by the LHCb experiment. The sample consists of about 1000 Ωb-→Ωc0μ-νμ X signal decays, where the Ωc0 baryon is detected in the pK-K-π+ final state and X represents possible additional undetected particles in the decay. The Ωc0 lifetime is measured to be τΩc0 = 268±24±10±2 fs, where the uncertainties are statistical, systematic, and from the uncertainty in the D+ lifetime, respectively. This value is nearly four times larger than, and inconsistent with, the current world-average value.