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Measurements of the τ mass and the mass difference of the τ+ and τ- at BABAR
- Aubert, B;
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- Lees, JP;
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- Wu, SL
- et al.
Abstract
We present the result from a precision measurement of the mass of the τ lepton, Mτ, based on 423fb-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 (Mτ+-Mτ-)/ MAVGτ=(-3.4±1.3(stat)±0.3(syst))×10-4, where MAVGτ is the average value of Mτ+ and Mτ-. © 2009 The American Physical Society.
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