Search for D0-D0B Mixing

TL;DR

This study searches for D0-D0B meson mixing by analyzing wrong-sign decay rates in electron-positron collision data, finding results consistent with no mixing within experimental uncertainties.

Contribution

First measurement of D0-D0B mixing parameters using time-dependent decay analysis in e+e- collisions at 10 GeV.

Findings

Wrong-sign decay rate measured at 0.332%

Mixing parameters x' and y' are consistent with zero

No significant evidence for D0-D0B mixing found

Abstract

We report on a search for D0-D0B mixing made by studying the `wrong-sign' process D0->K^+pi^-. The data come from an integrated luminosity of 9.0 1/fb of e^+e^- collisions at s^(1/2) of approximately 10 GeV recorded with the CLEO II.V detector. We measure the time integrated rate of the `wrong-sign' process D0->K^+pi^- relative to that of the Cabibbo-favored process D0B->K^+pi^- to be R=(0.332^{+0.063}_{-0.065}+-0.040)%. We study D0->K^+pi^- as a function of decay time to distinguish direct doubly Cabibbo-suppressed decay from D0-D0B mixing. The amplitudes that describe D0-D0B mixing, x' and y', are consistent with zero. At the 95% C.L. and without assumptions concerning charge-parity (CP) violating parameters, we find (1/2)x'^2 < 0.041% and -5.8% < y' < 1.0%.