We present the result from a precision measurement of the mass of the tau lepton, M(tau), based on 423 fb(-1) of data recorded at the Upsilon(4S) resonance with the BABAR detector. Using a pseudomass endpoint method, we determine the mass to be 1776.68 +/- 0.12(stat)+/- 0.41(syst) MeV. We also measure the mass difference between the tau(+) and tau(-), and obtain (M(tau)(+)-M(tau)(-))/M(AVG)(tau)=(-3.4 +/- 1.3(stat)+/- 0.3(syst))x10(-4), where M(AVG)(tau) is the average value of M(tau)(+) and M(tau)(-).

Measurements of the tau mass and the mass difference of the tau(+) and tau(-) at BABAR RID C-5223-2009

ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2009

Abstract

We present the result from a precision measurement of the mass of the tau lepton, M(tau), based on 423 fb(-1) of data recorded at the Upsilon(4S) resonance with the BABAR detector. Using a pseudomass endpoint method, we determine the mass to be 1776.68 +/- 0.12(stat)+/- 0.41(syst) MeV. We also measure the mass difference between the tau(+) and tau(-), and obtain (M(tau)(+)-M(tau)(-))/M(AVG)(tau)=(-3.4 +/- 1.3(stat)+/- 0.3(syst))x10(-4), where M(AVG)(tau) is the average value of M(tau)(+) and M(tau)(-).
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