Measurement of the mass of the $\tau$-lepton and an upper limit on the mass difference between ${\tau }^{+}$ and ${\tau }^{-}$

Abstract

The mass of the $\tau$ lepton has been measured in the decay mode $\tau \to 3\pi {\nu }_{\tau }$ using a pseudomass technique. The result obtained from $414{\mathrm{fb}}^{-1}$ of data collected with the Belle detector is $M_{\tau }=(1776.61\pm 0.13(stat.)\pm 0.35(sys.))$ MeV/$c^2$. The upper limit on the relative mass difference between positive and negative $\tau$ leptons is $|M_{{\tau }^{+}}-M_{{\tau }^{-}}|/M_{\tau }<2.8\times 10^{-4}$ at 90% confidence level.

9 pages, 3 figures. Submitted to Phys. Rev. Lett

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• Tau Physics: Theory Overview
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• $\tau$ mass and $R$ value measurements at BES
• Hadronic and radiative decays of the tau lepton
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• Generalised Known Kinematics (GKK) An Approach for Kinematic Observables in Pair Production Events with Decays Involving Invisible Particles
• Study $\gamma \gamma \to {\tau }^{+}{\tau }^{-}$ process including ${\tau }^{+}{\tau }^{-}$ spin information in Pb-Pb ultraperipheral collision and at Lepton collider
• Measurements of |Vus| and Searches for Violation of Lepton Universality and CPT in Tau Decays at BaBar