Weak Value Amplification in High Energy Physics: A Case Study for Precision Measurement of CP Violation in B Meson Decays

TL;DR

This paper explores applying weak value amplification to high energy physics, specifically for measuring CP violation in B meson decays, demonstrating potential improvements in measurement precision and decay lifetime analysis.

Contribution

It is the first to demonstrate the feasibility of using weak value amplification in high energy physics for CP violation measurements in B mesons.

Findings

Effective lifetime can be prolonged up to 2.6 times with postselection.

Measurement precision of CP-violating parameters can be improved.

Feasibility shown for implementation in Belle II experiment.

Abstract

The technique of weak value amplification, proposed by Aharonov et al. in 1988, has been applied for various fields of physics for the purpose of precision measurement, which is made possible by exploiting the freedom of `postselection' specifying actively the final state in the physical process. Here we report for the first time the feasibility of utilizing the technique of weak value amplification in high energy particle physics, especially in measuring the CP-violating parameters in B meson decays, where the effective lifetime of the decay mode is expected to be prolonged statistically due to the postselection. Our analysis shows that, when adopted in the Belle II experiment at the SuperKEKB collider, the effective lifetime may be prolonged up to 2.6 times, and that the measurement precision of the CP-violating parameters will also be improved by its effect.