On CP violation and the measurement of the dimuon charge asymmetry at hadron colliders

TL;DR

This paper discusses how to extract the CP violation parameter of B_s meson mixing from dimuon charge asymmetry measurements at hadron colliders, highlighting a subtle methodological point.

Contribution

It introduces a nuanced approach to determine the CP violation parameter from collider measurements, addressing a subtlety in the extraction process.

Findings

Clarifies the relationship between dimuon asymmetry and CP violation parameters.

Highlights a subtlety in the measurement process at hadron colliders.

Provides guidance for more accurate extraction of CP violation parameters.

Abstract

B factories measure the CP violation parameter of B^0 Bbar^0 mixing and decay. Hadron colliders measure the dimuon charge asymmetry of an admixture of B hadrons. In this note we discuss a subtle point on how the CP violation parameter of B^0_s Bbar^0_s mixing and decay can be extracted from these measurements.