Observation of charm mixing by LHCb

by Angelo Di Canto (Ruprecht-Karls-Universitaet Heidelberg (DE))

Thursday 7 Mar 2013, 11:00 → 12:00 Europe/Zurich

4/2-011 - TH common room (CERN)

We report a measurement of the time-dependent ratio of D0->K+pi- to D0->K-pi+ decay rates in D*+-tagged events using 1.0 fb^{-1} of integrated luminosity recorded by the LHCb experiment. We measure the mixing parameters x'2=(-0.9+-1.3)x10^{-4}, y'=(7.2+-2.4)x10^{-3} and the ratio of doubly-Cabibbo-suppressed to Cabibbo-favored decay rates R_D=(3.52+-0.15)x10^{-3}, where the uncertainties include statistical and systematic sources. The result excludes the no-mixing hypothesis with a probability corresponding to 9.1 standard deviations and represents the first observation of D0-D0bar oscillations from a single measurement.

Paper http://arxiv.org/abs/1211.1230