A Measurement of CP Violation in B0 Meson Decays with Belle

TL;DR

This paper reports a preliminary measurement of the CP violation parameter sin 2φ₁ in B0 meson decays using data from the Belle detector at KEKB, contributing to understanding matter-antimatter asymmetry.

Contribution

First measurement of sin 2φ₁ in B0 decays using Belle data at KEKB, providing initial results for CP violation in the Standard Model.

Findings

Measured sin 2φ₁ = 0.45 with statistical and systematic uncertainties.

Used 6.2 fb⁻¹ of data from KEKB collider.

Preliminary result consistent with Standard Model expectations.

Abstract

We present a preliminary measurement of the Standard Model CP violation parameter $\sin 2\phi_1$ using the Belle detector. A $6.2~{\rm fb}^{-1}$ sample of events produced by the KEKB asymmetric $e^+e^-$ collider operating at the $\Upsilon(4S)$ resonance is used. We report a preliminary result of $$\sin 2\phi_1=0.45^{+0.43}_{-0.44}({\rm stat})^{+0.07}_{-0.09}({\rm syst}).$$