First Measurement of phi_3 with a Model-independent Dalitz Plot Analysis of B->DK, D->KsPiPi Decay

TL;DR

This paper reports the first model-independent measurement of the CP-violating angle phi_3 using Dalitz plot analysis of B->DK, D->KsPiPi decays, leveraging input from CLEO and data from the Belle experiment.

Contribution

It introduces a novel model-independent approach to measure phi_3 with D->KsPiPi decays, utilizing strong phase inputs from CLEO and Belle's full dataset.

Findings

Measured phi_3 = (77.3^{+15.1}_{-14.9} ± 4.1 ± 4.3) degrees

Determined the suppressed amplitude ratio r_B = 0.145 ± 0.030 ± 0.010 ± 0.011

First model-independent measurement of phi_3 in this decay channel.

Abstract

We present the first measurement of the angle phi_3 of the Unitarity Triangle using a model-independent Dalitz plot analysis of B->DK, D->KsPiPi decays. The method uses an input measurements of the strong phase of the D->KsPiPi amplitude from the CLEO collaboration. The result is based on the full data set of 772x10^6 BBbar pairs collected by the Belle experiment at the Upsilon(4S) resonance. We obtain phi_3 = (77.3^{+15.1}_{-14.9} +- 4.1 +- 4.3)^{\circ} and the suppressed amplitude ratio r_B = 0.145 +- 0.030 +- 0.010 +- 0.011. Here the first error is statistical, the second is the experimental systematic uncertainty, and the third is the error due to the precision of the strong-phase parameters obtained by CLEO.