Search for CP violation in the decay B0->D*+-D-+

TL;DR

This paper searches for CP violation in B0 -> D*+- D-+ decays using full and partial reconstruction methods, finding a 2.7 sigma indication of nonzero CP asymmetry.

Contribution

It introduces two reconstruction techniques for B0 decays and measures CP asymmetry, providing new insights into CP violation in these decay channels.

Findings

Observed a 2.7 sigma significance for CP asymmetry

Used full and partial reconstruction methods

Measured CP-violating parameters in B0 decays

Abstract

We report a search for CP-violating asymmetry in B0 -> D*+- D-+ decays. The analysis employs two methods of B0 reconstruction: full and partial. In the full reconstruction method all daughter particles of the B0 are required to be detected; the partial reconstruction technique requires a fully reconstructed D- and only a slow pion from the D*+ -> D0 pi_slow+ decay. From a fit to the distribution of the time interval corresponding to the distance between two B meson decay points we calculate the CP-violating parameters and find the significance of nonzero CP asymmetry to be 2.7 standard deviations.