Constraints on the unitarity triangle angleγfrom Dalitz plot analysis ofB0→DK+π−decays

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doi:10.1103/physrevd.93.112018

Abstract

The first study is presented of CP violation with an amplitude analysis of the Dalitz plot of B0→DK+π- decays, with D→K+π-, K+K-, and π+π-. The analysis is based on a data sample corresponding to 3.0 fb-1 of pp collisions collected with the LHCb detector. No significant CP violation effect is seen, and constraints are placed on the angle γ of the unitarity triangle formed from elements of the Cabibbo-Kobayashi-Maskawa quark mixing matrix. Hadronic parameters associated with the B0→DK∗(892)0 decay are determined for the first time. These measurements can be used to improve the sensitivity to γ of existing and future studies of the B0→DK∗(892)0 decay.

Highlights

One of the most important challenges of physics today is understanding the origin of the matter-antimatter asymmetry of the Universe
This paper describes the first study of CP violation with a Dalitz plot (DP) analysis of B0 → DK þ π − decays, with a sample corresponding to 3.0 fb−1 of pp collision data collected with the LHCb detector at center-of-mass energies of 7 and
The tracking system provides a measurement of momentum, p, of charged particles with a relative uncertainty that varies from 0.5% at low momentum to 1.0% at 200 GeV=c

Summary

INTRODUCTION

From analysis of the Dalitz plot with the neutral D meson reconstructed in a favored decay mode such as. The method allows the determination of γ and the hadronic parameters rB and δB , which are the relative magnitude and strong (i.e. CP-conserving) phase of the V ub and V cb amplitudes for the B0 → DK 0 decay, with only CP-even D decays required to be reconstructed in addition to the favored decays. This feature, which is in contrast to the method of Refs. The notation DCP represents a neutral D meson reconstructed in a CP eigenstate, while

DETECTOR AND SIMULATION

SELECTION

DALITZ PLOT ANALYSIS

RESULTS AND SUMMARY