Measurement of the Ωc0 baryon lifetime with LHCb

Ward, Jake Alexander (2021) Measurement of the Ωc0 baryon lifetime with LHCb. MSc(R) thesis, University of Glasgow.

Due to Embargo and/or Third Party Copyright restrictions, this thesis is not available in this service.


The results of the measurement of the Ωc0 charmed baryon lifetime via the Ωb → Ωc0π decay mode are presented in this thesis. The result makes use of the proton-proton collision data collected by the LHCb detector at CERN in the years 2011-2012 and 2015-2016 using the full 8.7 fb⁻¹ total integrated luminosity data.
The lifetime of the Ωc0 baryon was measured to be
τΩc0 = 238 ± 33 (stat) ± 21 (syst) ± 1 (τD⁰) fs,
where the first uncertainty is statistical, the second systematic, and the third due to the use of the world-average D⁰ lifetime. The lifetime is measured as a ratio of Ωb → Ωc0π to B → D⁰π decays in order to cancel out the decay time dependent reconstruction and selection efficiencies, using 284 Ωc0 and 55317 D⁰ candidates. The measurement agrees with the previous LHCb measurement in 2016 [1], at -0.63σ from the measurement, using data collected in 2011-2012 of
τΩc0 = 268 ± 24 ± 10 fs,
which reorders the hierarchy of the charmed baryon lifetimes predicted in the heavy quark effective theory.

Item Type: Thesis (MSc(R))
Qualification Level: Masters
Keywords: Baryon, CERN, LHCb, lifetime, Omega, neutral, charm, flavour, physics, D0, hqet, run 2, run 1, proton proton, collision data, tau, heavy quark effective theory, pkkpi.
Subjects: Q Science > QC Physics
Colleges/Schools: College of Science and Engineering > School of Physics and Astronomy
Supervisor's Name: Eklund, Professor Lars
Date of Award: 2021
Embargo Date: 20 November 2021
Depositing User: Alastair Arthur
Unique ID: glathesis:2021-82220
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 25 May 2021 13:30
Last Modified: 25 May 2021 13:31
Thesis DOI: 10.5525/gla.thesis.82220

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