Measurement of the B0 Lifetime with Partial Reconstruction of B0bar -> D*+ rho-

TL;DR

This paper measures the B0 meson lifetime using partial reconstruction techniques on specific decay channels, providing a validation method for future CP violation measurements in B mesons.

Contribution

It introduces a partial reconstruction method to measure B0 lifetime with a new dataset, aiding future CP violation studies.

Findings

B0 lifetime measured as 1.616 ps

Sample of 5500 D*+ rho- events identified

Validation of partial reconstruction for CP measurements

Abstract

A sample of about 5500 $\bar B^0 \to D^{*+} \rho^-$ and 700 $\bar B^0 \to D^{*+} a_1^-$ events is identified, using the technique of partial reconstruction, among 22.7 $B\bar B$ pairs collected by the BaBar experiment at the PEP-II storage ring. With these events, the $B^0$ lifetime is measured to be $1.616 \pm 0.064 \pm 0.075$ ps. This measurement serves as validation for the procedures required to measure $\sin(2\beta + \gamma)$ with partial reconstruction of $\bar B^0 \to D^{*+} \rho^-$.