Mittagsseminar (in cooperation with J. Lengler, A. Steger, and D. Steurer)

Date and Time: Thursday, November 01, 2012, 12:15 pm

Duration: 30 minutes

Location: OAT S15/S16/S17

Speaker: Federico Padua

Search for CP violation in the charm decays with the BaBar experiment

Symmetry and its violations have always had a special role in society and in science. From ancient Greek to modern times, symmetry has been one of the guiding principles in various areas, e.g. architecture, music,etc. Physics, and in particular particle physics, has adopted symmetry as one of the guiding principles to build theories and make predictions. As a matter of fact, one of the most peculiar and interesting aspects of the Standard Model of fundamental interactions (in brief SM) is the violation of the symmetry under the combined charge conjugation C and parity P transformation (CP) . If CP were an exact symmetry, the laws of Nature would be the same for matter and for antimatter. However the CP symmetry is violated in certain processes, as discovered in neutral K decays in 1964 by Christenson, Cronin, Fitch and Turlay and observed in 2001 in B_d decays by the experiments BABAR and Belle for the first time. In the SM, CP violation is described by a single phase in the Cabibbo-Kobayashi- Maskawa (CKM) quark mixing matrix. Many of the theories that extend the SM provide additional mechanisms for CP violation. CP symmetry/violation can be studied in different systems, but the neutral charmed mesons system plays a unique role because CP violation has not been discovered yet in this system. Measurements in this system will provide additional constraints on the flavour parameters of the SM, and can probe New Physics (NP). In this talk I will give you a general overview of various symmetries which are used very often in particle physics, how they are implemented in Quantum Mechanics and a general overview of the Standard Model of particle physics. I'll also explore in some details a particular measurement in preparation at the BaBar experiment which will probe the CP symmetry in the charm sector of the SM.

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