A simulation study on the measurement of D0-D0bar mixing parameter y at BES-III

Abstract

We established a method on measuring the $\dzdzb$ mixing parameter $y$ for BESIII experiment at the BEPCII $e^{+}{e}^{-}$ collider. In this method, the doubly tagged $\psi (3770)\to D^0\overline{D^0}$ events, with one $D$ decays to CP-eigenstates and the other $D$ decays semileptonically, are used to reconstruct the signals. Since this analysis requires good $e/\pi$ separation, a likelihood approach, which combines the $dE/dx$, time of flight and the electromagnetic shower detectors information, is used for particle identification. We estimate the sensitivity of the measurement of $y$ to be 0.007 based on a $20f{b}^{-1}$ fully simulated MC sample.

6 pages, 7 figures