Measurement of the CKM angle $\gamma$ in the $B^0 \to DK^{*0}$ channel using self-conjugate $D \to K_S^0 h^+ h^-$ decays

TL;DR

This paper presents a model-independent measurement of the CKM angle gamma in B0 decays to D K*0 using self-conjugate D decays, providing insights into CP violation with data from the LHCb experiment.

Contribution

First model-independent determination of gamma in B0 to D K*0 decays using phase-space analysis of self-conjugate D decays at LHCb.

Findings

Gamma measured as (49^{+22}_{-19}) degrees.

Measured amplitude ratio and strong-phase difference.

CP violation observables quantified.

Abstract

A model-independent study of CP violation in $B^0 \to DK^{*0}$ decays is presented using data corresponding to an integrated luminosity of 9fb$^{-1}$ collected by the LHCb experiment at centre-of-mass energies of $\sqrt{s}=7, \, 8$ and $13$TeV. The CKM angle $\gamma$ is determined by examining the distributions of signal decays in phase-space bins of the self-conjugate $D \to K_S^0 h^+ h^-$ decays, where $h = \pi, K$. Observables related to CP violation are measured and the angle $\gamma$ is determined to be $\gamma=(49^{+ 22}_{-19})^\circ$. Measurements of the amplitude ratio and strong-phase difference between the favoured and suppressed $B^0$ decays are also presented.