Measurement of the Strange Spectral Function in Hadronic tau Decays

TL;DR

This paper measures the strange spectral function in tau lepton decays involving kaons and pions using OPAL detector data, providing new experimental results crucial for theoretical analyses of strange hadronic processes.

Contribution

It presents the first detailed measurement of the strange spectral function in tau decays, including invariant mass distributions, spectral moments, and branching fractions, with improved accuracy.

Findings

Strange spectral function determined from 93.4% of final states.

Branching fraction for tau -> K-pi0 nu measured as (0.471+-0.064+-0.022)%.

Branching fraction for tau -> K-pi+pi- nu measured as (0.415+-0.059+-0.031)%.

Abstract

Tau lepton decays with open strangeness in the final state are measured with the OPAL detector at LEP to determine the strange hadronic spectral function of the tau lepton. The decays T- ->(Kpi)-nu tau, (Kpipi)-nu tau and (Kpipipi) -nu tau with final states consisting of neutral and charged kaons and pions have been studied. The invariant mass distributions of 93.4% of these final states have been experimentally determined. Monte Carlo simulations have been used for the remaining 6.6% and for the strange final states including eta mesons. The reconstructed strange final states, corrected for resolution effects and detection efficiencies, yield the strange spectral function of the tau lepton. The moments of the spectral function and the ration of strange to non-strange moments, which are important input parameters for theoretical analysis, are determined. Furthermore, the branching fractions B(tau- -> K-pi0nu tau)=(0.471+-0.064stat+_0.022sys)% and B(tau- -> K-pi+pi-nu tau)=(0.415+-0.059stat+-0.031sys)% have been measured.