First measurement of ADS parameters using B- -> D0K- decays in hadron collisions

TL;DR

This paper reports the first measurement of ADS parameters in B- -> D0K- decays at a hadron collider, providing a new way to extract the CKM angle gamma with high significance.

Contribution

It presents the first hadron collider measurement of B- -> D0h- decay branching fractions and CP asymmetries using the ADS method, achieving precision comparable to B-factories.

Findings

Combined significance exceeds 5 sigma.

ADS parameters measured with high accuracy.

Results enable a cleaner extraction of CKM angle gamma.

Abstract

Measurements of branching fractions and CP-asymmetries of B^{-} \rightarrow D^{0}K^{-} modes allow a theoretically-clean extraction of the CKM angle \gamma. The method proposed by Atwood, Dunietz and Soni (ADS) makes use of a decay chain where color and Cabibbo suppression interfere, which produces large CP-violating asymmetries. The CDF experiment reports the first measurement at a hadron collider of branching fractions and CP-asymmetries of suppressed B^{-} \rightarrow D^{0}h^{-} signals, where h is \pi or K. Using 5.0 fb^{-1} of data we found a combined significance exceeding 5\sigma and we determined the ADS parameters with accuracy comparable with B-factories.