Measurement of the tau- --> K- pi0 nu_tau Branching Fraction

TL;DR

This paper reports a precise measurement of the tau lepton decay branching fraction into K- pi0 nu_tau using data from the BABAR detector, providing valuable insights into tau decay processes.

Contribution

The study presents the first high-precision measurement of the tau- --> K- pi0 nu_tau branching fraction using a large dataset from BABAR.

Findings

Branching fraction measured as (0.416 +/- 0.003 (stat) +/- 0.018 (syst)) %.

Data collected from 230.2 fb-1 at the PEP-II collider.

Results improve the precision of tau decay measurements.

Abstract

A measurement of the tau- --> K- pi0 nu_tau branching fraction has been made using 230.2 fb-1 of data recorded by the BABAR detector at the PEP-II e+ e- collider, located at the Stanford Linear Accelerator Center (SLAC), at a center of mass energy sqrt{s} close to 10.58 GeV. We measure BF(tau- --> K- pi0 nu_tau) = (0.416 +/- 0.003 (stat) +/- 0.018 (syst)) %.