LHC Seminar

First evidence for CP Violation in charm decays at LHCb

by Angelo Carbone (Universita e INFN (IT))

500-1-001 - Main Auditorium (CERN)

500-1-001 - Main Auditorium


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The LHCb Collaboration has recently observed evidence of CP violation in neutral D meson decays. CP violation in the charm sector is generically expected to be very small in the Standard Model, but can be enhanced in many models of new physics. In this seminar we will present the results of a search for time-integrated CP violation in D0 -> h- h+ (h=K,pi) decays, performed with around 0.6 fb-1 of data collected by LHCb in 2011. The difference in CP asymmetry between D0 -> K- K+ and D0 ->pi- pi+, Delta A_CP = A_CP(K- K+) - A_CP(pi- pi+) is measured to be Delta A_CP = [-0.82 +- 0.21 (stat.) +- 0.11 (syst.)]%. This differs from the hypothesis of CP conservation by 3.5 sigma. Prospects for improved measurements of this quantity and other CP-violating observables in the charm sector will be briefly discussed.
Organized by

M. Spiropulu, M. Mangano, G. Unal......................... Tea and Coffee will be served at 10h30

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