Tests of Lepton Flavour Universality using semitauonic B decays in the LHCb experiment at CERN

  1. García Plana, Beatriz
Supervised by:
  1. Abraham Gallas Torreira Director
  2. Antonio Romero Vidal Director

Defence university: Universidade de Santiago de Compostela

Fecha de defensa: 27 July 2022

Committee:
  1. Maria Lúcia Grillo Chair
  2. Juan Jose Saborido Silva Secretary
  3. Ricardo Vázquez Gómez Committee member
Department:
  1. Department of Particle Physics

Type: Thesis

Teseo: 736913 DIALNET lock_openMINERVA editor

Abstract

The LHCb experiment foresees a new era of high luminosity, aiming to clarify persistent tensions between experiments and the SM predictions, such as those related to the flavour sector. This thesis is devoted to the measurement of the LFU ratios R(D0) and R(D*0), with the 3-prong hadronic tau decay modes, using LHCb Run 2 data. Even though the final result is blinded and the systematics uncertainties need to be computed, the signal branching fraction are obtained with a competitive precision. Moreover, the computation of the statistical and external uncertainties of the R(D(*)0) ratios hints that the analysis documented here will be a relevant contribution to the LFU sector. Furthermore, a contribution to the LHCb detector upgrade is documented, based on testing the new hybrid pixel VELO sensors' performance.