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American Physical Society, Physical Review D, 9(80)

DOI: 10.1103/physrevd.80.092005

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Measurements of theτmass and the mass difference of theτ+andτ−atBABAR

Journal article published in 2009 by B. Aubert, Y. Karyotakis, J. P. Lees, V. Poireau, E. Prencipe, X. Prudent, V. Tisserand, J. Garra Tico, E. Grauges, M. Martinelli, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We present the result from a precision measurement of the mass of the $τ$ lepton, $M_τ$, based on $423 fb^{-1}$ of data recorded at the $ϒ(4S)$ 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 $τ^+$ and $τ^-$, and obtain $(M_{τ^{+}}-M_{τ^{-}})/M^τ_{AVG} = (-3.4 ± 1.3 (stat) ± 0.3 (syst)) \times 10^{-4}$, where $M^τ_{AVG}$ is the average value of $M_{τ^+}$ and $M_{τ^-}$. ; Comment: 15 pages, 10 figures, submitted to Phys. Rev. D