Date of Award

Summer 7-1-2022

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Advisor(s)

Artuso, Marina

Keywords

CERN, CP Violation, Lambda_c Baryon, LHCb, Vcb

Subject Categories

Physical Sciences and Mathematics | Physics

Abstract

A preliminary measurement of the quark-mixing parameter |Vcb| using the exclusive decay Λ0b→ Λ+c μ−νμ is presented. A sample of Λb semileptonic decays is provided by √s = 13TeV proton-proton collisions collected by the LHCb detector in 2017. Λ0b → Λ+c μ−νμX decays are identified from muon tracks, combined with a Λc baryon. The ground state Λ0b → Λ+c μ−νμ is isolated by a fit to the Λb corrected mass spectrum. The raw yield NRaw(Λ0b → Λ+c μ−νμ) is corrected, and the semileptonic width ΓMeas. (Λ0b → Λ+c μ−νμ) is obtained. Lattice QCD calculations predict ΓTh.(Λ0b → Λ+c μ−νμ)/|Vcb|2. A comparison between the measured and predicted widths gives |Vcb| from the relative normalization. This method also provides a measurement of the branching fraction B(Λ0b → Λ+c μ−νμ) using well-measured properties of B-meson decays.

Access

Open Access

Available for download on Saturday, April 08, 2023

Included in

Physics Commons

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