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This thesis presents a measurement of charm mixing and CP-violation parameters using D0 -> K0S pi+ pi- decays. These mixing parameters include the mass and decay-width differences of the mass eigenstates of the D0-D0bar system. A search for Charge-Parity violation is performed through measurements of D0-D0b mixing and of the interference between mixing and decay amplitudes. The dataset consists of events reconstructed in proton-proton collisions collected by the LHCb experiment during theoperation of the Large Hadron Collider (LHC) from 2016 to 2018. This sample corresponds to an integrated luminosity of 5.4 fb^-1. The D0 decays are selected in semileptonically decays of b hadrons. The results are expressed in terms of the CP-averaged mixing parameters and CP-violating differences asx_cp= (+4.29 +/- 1.48 (stat) +/- 0.26 (syst)) x 10^{-3}y_cp= (+12.61 +/- 3.12 (stat) +/- 0.83 (syst)) x 10^{-3}delta x= (-0.77 +/- 0.93 (stat) +/- 0.28 (syst)) x 10^{-3}delta y= (+3.01 +/- 1.92 (stat) +/- 0.26 (syst)) x 10^{-3}where the first uncertainty is statistical and the second is systematic. They correspond to the mixing and CP-violation parameters x = 0.46^{+0.15}{-0.16} x 10^{-2} y = 1.24^{+0.32}{-0.33} x 10^{-2} |q/p| = 1.21^{+0.21}{-0.15} \phi = -0.132^{+0.088}{-0.120} rad.The value of x deviates from zero with a significance of almost 3 sigma.These results are complementary to and consistent with previous measurements and with the current world-average values.They represent an independent and complementary knowledge of the charm-mixing parameters.A combination with the recent LHCb analysis of Dstar -> D0 (->K0S pi+ pi-) pi decays is also reported.
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Liupan An, Guido Andreassi, Vladislav Balagura, Aurelio Bay, Violaine Bellée, Federico Betti, Marc-Olivier Bettler, Frédéric Blanc, Maxim Borisyak, Daniel Hugo Cámpora Pérez, Lucía Castillo García, Peter Clarke, Victor Coco, Greig Alan Cowan, Adam Davis, Hans Dijkstra, Mirco Dorigo, Paolo Durante, François Fleuret, Christoph Frei, Olivier Göran Girard, Luis Alberto Granado Cardoso, Elena Graverini, Guido Haefeli, Xiaoxue Han, Plamen Hristov Hopchev, Thibaud Humair, Chitsanu Khurewathanakul, Ilya Komarov, Axel Kuonen, Yiming Li, Pietro Marino, Maurizio Martinelli, Katharina Müller, Tatsuya Nakada, Matthew Needham, Niko Neufeld, Preema Rennee Pais, Luca Pescatore, Anton Petrov, Cédric Potterat, Jessica Prisciandaro, Albert Puig Navarro, Renato Quagliani, Gerhard Raven, Federico Leo Redi, Olivier Schneider, Maxime Schubiger, Pavol Stefko, Maria Elena Stramaglia, Liang Sun, Frédéric Teubert, Mark Tobin, Minh Tâm Tran, Maria Vieites Diaz, Jian Wang, Jean Wicht, Zhirui Xu, Hang Yin, Lei Zhang, Yi Zhang, Yu Zheng