Measurement of the $B^-$ lifetime using a simulation free approach for trigger bias correction

TL;DR

This paper introduces an analytic, simulation-free method to correct trigger bias in $B^-$ lifetime measurements, reducing systematic uncertainties compared to traditional simulation-based approaches.

Contribution

The paper presents a novel analytic approach for bias correction in lifetime measurements, eliminating reliance on Monte Carlo simulations and reducing systematic uncertainties.

Findings

Measured $B^-$ lifetime as 1.663 ± 0.023 (stat) ± 0.015 (syst) ps.

Achieved smaller systematic uncertainty compared to simulation-based methods.

Demonstrated effectiveness of the analytic bias correction method.

Abstract

The collection of a large number of $B$ hadron decays to hadronic final states at the CDF II detector is possible due to the presence of a trigger that selects events based on track impact parameters. However, the nature of the selection requirements of the trigger introduces a large bias in the observed proper decay time distribution. A lifetime measurement must correct for this bias and the conventional approach has been to use a Monte Carlo simulation. The leading sources of systematic uncertainty in the conventional approach are due to differences between the data and the Monte Carlo simulation. In this paper we present an analytic method for bias correction without using simulation, thereby removing any uncertainty between data and simulation. This method is presented in the form of a measurement of the lifetime of the $B^{-}$ using the mode B -> D0 pi. The $B^-$ lifetime is measured as $\tau_{B^-}$ = 1.663 $\pm$ 0.023 $\pm$ 0.015 ps, where the first uncertainty is statistical and the second systematic. This new method results in a smaller systematic uncertainty in comparison to methods that use simulation to correct for the trigger bias.