Measurement of the bottom-strange meson oscillations at LHCb

  1. Romero Lamas, Marcos
Supervised by:
  1. Bernardo Adeva Andany Director
  2. Diego Martinez Santos Director
  3. Veronika G. Chobanova Director

Defence university: Universidade de Santiago de Compostela

Fecha de defensa: 27 February 2023

Committee:
  1. Tatsuya Nakada Chair
  2. Xabier Cid Vidal Secretary
  3. Farvah Nazila Mahmoudi Committee member
Department:
  1. Department of Particle Physics

Type: Thesis

Teseo: 799816 DIALNET lock_openMINERVA editor

Abstract

A measurement of the mixing-induced CP violation phase in the bottomstrange meson system and its oscillation parameters through the dimuon (after a charmonium decay) and dikaon decay mode is reported. The weak phase difference is precisely constrained within the Standard Model, constituting a key probe for new physics phenomena. This preliminary analysis uses 6/fb of 13 TeV proton-proton collisions at LHCb and constitutes the world's most precise measurement of the CP violation phase, the decay width, and the decay-width splitting of the bottom-strange meson. In a flavor-tagged time-dependent angular fit to about half a million signal candidates of background subtracted data, a statistical uncertainty of 22 mrad in the CP violating phase is achieved.