Measurement of the CKM angle gamma in B ->D(*)0K decays with a Dalitz analysis of D0->KS pi- pi+

TL;DR

This paper measures the CP-violating phase gamma in B meson decays using a Dalitz plot analysis of D0 decays, providing a value with associated uncertainties from a large data sample.

Contribution

It presents a novel measurement of gamma using Dalitz analysis of D0 decays in B to D(*)K decays with a large BaBar dataset.

Findings

Measured gamma = (92 +/- 41 +/- 11 +/- 12) degrees.

Determined amplitude ratios r_B^{(*)} within specific intervals.

Results are preliminary and include statistical, systematic, and model uncertainties.

Abstract

We present a measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase gamma with a Dalitz analysis of neutral D-meson decays to the K^0_s pi^- pi^+ final state from B^+/- -> D^{(*)}K^+/- decays, using a sample of 347 million B\bar{B} events collected by the BaBar detector. We measure gamma = (92 +/- 41 +/- 11 +/- 12)deg, where the first error is statistical, the second is the experimental systematic uncertainty and the third reflects the Dalitz model uncertainty. For the ratios r_B^{(*)} between the magnitudes of amplitudes A(B- -> D^{(*)0}K-) and A(B- ->\bar{D}^{(*)0} K-) we obtain the one-standard deviation intervals [0,0.14] and [0.02,0.20], respectively. All results presented here are preliminary.