The measurement of sin(2beta)

TL;DR

This paper discusses the measurement of sin(2beta) through CP violation in B meson decays, highlighting recent evidence from the CDF collaboration that aligns with standard model predictions.

Contribution

It reports the first evidence of CP violation in the B system using a large sample of B to J/psi K0_S decays, providing a direct measurement of sin(2beta).

Findings

Evidence of CP violation in B decays

Measured sin(2beta)=0.79 with large uncertainties

Results consistent with standard model predictions

Abstract

Since the first observation in 1964, CP violation remains one of the most elusive aspects of the standard model. The CDF collaboration has reported the first evidence of CP violation in the B system using the world's largest sample of $B \to J/\psi K^0_S $ decays. The direct measurement of sin$(2\beta)$=0.79$^{+0.41}_{-0.44}$ (combined statistical and systematic error) agrees with the standard model predictions. New data collected from the B-factories and from the upgraded experiments at the Tevatron should allow a more precise measurement of $\sin 2\beta$ in the near future.