Abstract
We present a measurement of the semileptonic mixing asymmetry for mesons, , using two independent decay channels: , with ; and , with , (and charge conjugate processes). We use a data sample corresponding to of collisions at , collected with the D0 experiment at the Fermilab Tevatron collider. We extract the charge asymmetries in these two channels as a function of the visible proper decay length of the meson, correct for detector-related asymmetries using data-driven methods, and account for dilution from charge-symmetric processes using Monte Carlo simulation. The final measurement combines four signal visible proper decay length regions for each channel, yielding . This is the single most precise measurement of this parameter, with uncertainties smaller than the current world average of factory measurements.
2 More- Received 30 August 2012
DOI:https://doi.org/10.1103/PhysRevD.86.072009
© 2012 American Physical Society