Measurement of the B0->PhiK*0 Decay Amplitudes

TL;DR

This paper presents a detailed angular analysis of B0->PhiK*0 decay using a large data sample, measuring decay amplitudes, CP asymmetries, and observing a new decay mode, providing insights into CP violation and decay dynamics.

Contribution

It provides the first comprehensive measurement of decay amplitudes, phases, and CP asymmetries for B0->PhiK*0, including the observation of B0->PhiK*0(1430).

Findings

Branching fraction measured as (9.2+-0.9+-0.5)×10^-6.

Longitudinal fraction f_L=0.52+-0.05+-0.02.

CP asymmetries constrained, indicating limits on new physics.

Abstract

With a sample of about 227 million BB pairs recorded with the BABAR detector at the PEP-II storage ring we perform a full angular analysis of the decay B0->PhiK*0(892). We measure the branching fraction to be (9.2+-0.9+-0.5)10^-6 and determine the fractions of longitudinal and parity-odd transverse contributions as f_L=0.52+-0.05+-0.02 and f_perp=0.22+-0.05+-0.02, respectively. The phases of the parity-even and parity-odd transverse amplitudes relative to the longitudinal amplitude are found to be phi_parallel= 2.34+0.23-0.20+-0.05 rad and phi_perp=2.47+-0.25+-0.05 rad, respectively. We measure five CP asymmetries which provide important limits on CP violation originating from new physics. We also observe the decay B0->PhiK*0(1430).