CP-violation in partially reconstructed B± → D*h± decays at LHCb

Thesis

This thesis presents a measurement of CP-violation in partially reconstructed B±→D*K± and B±→D*π± decays, where the neutral pion and photon from the D*→Dπ0 and D*→Dγ decays are not reconstructed. The D meson is subsequently reconstructed in the D→KS0π+π− or D→KS0K+K− final state. The measurement of CP-violation is performed by analysing the distribution of the signal yields over the D-decay phase space, without relying on a D-decay amplitude model. Instead, inputs for strong phase-related parameters measured at CLEO and BESIII are used. The measurement is performed using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, with a total integrated luminosity of approximately 9 fb−1. The work in this thesis measures CP-violating observables using partially reconstructed B±→D*K± and B±→D*π± decays at LHCb. These observables are interpreted in terms of physical parameters, including the Cabibbo-Kobayashi-Maskawa angle, γ, a fundamental Standard Model parameter. This is found to be γ = (92 +21 -17)◦, where the total uncertainty includes the statistical and all systematic uncertainties.

Authors: Stanislaus, S

• DOI: 10.5287/ora-xqqkpbm9m
• Type of award: DPhil
• Level of award: Doctoral
• Awarding institution: University of Oxford
• Language: English
• Keywords: particle physics; CERN; high energy physics; CP-violation; CKM; LHCb
• Subjects: Particles (Nuclear physics)--Flavor; Physics; CP violation (Nuclear physics)