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Measurement of the Ω{0/c} Baryon Lifetime

Aaij, R; Collaboration, L; Adeva, B; Adinolfi, M; Aidala, CA; Ajaltouni, Z; Akar, S; ... Zucchelli, S; + view all (2018) Measurement of the Ω{0/c} Baryon Lifetime. Physical Review Letter , 121 (9) , Article 092003. 10.1103/PhysRevLett.121.092003. Green open access

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Abstract

We report a measurement of the lifetime of the Ω{0/c} aryon 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 Ω{-/b} → Ω{0/c}μ - ν⁻_{μ}X signal decays, where the Ω{0/c} baryon is detected in the pK ⁻ K ⁻ π⁺ final state and X represents possible additional undetected particles in the decay. The Ω{0/c} lifetime is measured to be τ_{Ω}{0/c} = 268 ± 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.

Type: Article
Title: Measurement of the Ω{0/c} Baryon Lifetime
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.121.092003
Publisher version: https://doi.org/10.1103/PhysRevLett.121.092003
Language: English
Additional information: © 2018 American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/).
Keywords: Physical Systems, Heavy baryons, Particles & Fields
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health > Population, Policy and Practice Dept
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10028378
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