%0 Generic
%A Grillo, Lucia
%C Heidelberg, DE
%D 2015
%F heidok:19555
%R 10.11588/heidok.00019555
%T Measurement of CP violation in B0-B0bar mixing using semileptonic decays at LHCb
%U https://archiv.ub.uni-heidelberg.de/volltextserver/19555/
%X This thesis presents the measurement of the CP-violating asymmetry in B0-B0bar mixing using data corresponding to an integrated luminosity of 3.0 fb^{−1} collected at the LHCb experiment in proton-proton collisions at the center-of-mass energies of 7 TeV and 8 TeV. This analysis uses untagged, semileptonic B0 → D−μ+ν and B0 → D∗−μ+ν decays, where the D− decays into K+π−π−, and the D∗− decays into D0(→ K+π−)π−. The neutrino in the semileptonic B decays is not reconstructed. A decay time dependent fit allows to disentangle the CP asymmetry from the possible B0-B0bar production asymmetry. Detection and reconstruction asymmetries are calibrated using promptly produced Cabibbo-favored D+ decays, and inclusive secondary J/ψ decays. The CP-violating asymmetry is measured to be  a^{d}_{sl} = (−0.02 ± 0.19 (stat) ± 0.30 (syst))% .  This result is consistent with the Standard Model prediction, and it is the most precise measurement from a single experiment to date. This measurement is published in Physical Review Letters