Constraining the CKM Parameters using CP Violation in semi-leptonic B Decays

TL;DR

This paper explores how CP violation in semi-leptonic B decays can constrain CKM parameters and serve as a tool for detecting new physics, offering a complementary analysis method to the unitarity triangle.

Contribution

It introduces a novel approach using semi-leptonic asymmetry to constrain CKM parameters and interpret B-Bbar mixing data more clearly.

Findings

Semi-leptonic asymmetry a_{SL} can constrain CKM parameters.

Graphical analysis in terms of M_{12} offers clearer data interpretation.

Technique is promising for early B factory data analysis.

Abstract

We discuss the usefulness of the CP violating semi-leptonic asymmetry a_{SL} not only as a signal of new physics, but also as a tool in constraining the CKM parameters. We show that this technique could yield useful results in the first years of running at the B factories. We present the analysis graphically in terms of M_{12}, the dispersive part of the B-Bbar mixing amplitude. This is complementary to the usual unitarity triangle representation and often allows a cleaner interpretation of the data.