Precision Measurement of the Mass of the $\tau$ Lepton

06100 Tandogan; 141980 Dubna; 151-747 Korea (30) Shandong University; 16059 Bursa; 34722 Istanbul; 45C); 54000 Lahore (8) G.I. Budker Institute of Nuclear Physics SB RAS (BINP); 630090; a); A. A. Zafar (44)

arxiv: 1405.1076 · v2 · pith:KWEDPDRKnew · submitted 2014-05-05 · ✦ hep-ex

Precision Measurement of the Mass of the τ Lepton

M. Ablikim (1) , M. N. Achasov (8 , a) , X. C. Ai (1) , O. Albayrak (4) , M. Albrecht (3) , D. J. Ambrose (41) , F. F. An (1)

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classification ✦ hep-ex

keywords pairdataleptonmassmeasurementproductionscananalysis

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An energy scan near the $\tau$ pair production threshold has been performed using the BESIII detector. About $24$ pb$^{-1}$ of data, distributed over four scan points, was collected. This analysis is based on $\tau$ pair decays to $ee$, $e\mu$, $eh$, $\mu\mu$, $\mu h$, $hh$, $e\rho$, $\mu\rho$ and $\pi\rho$ final states, where $h$ denotes a charged $\pi$ or $K$. The mass of the $\tau$ lepton is measured from a maximum likelihood fit to the $\tau$ pair production cross section data to be $m_{\tau} = (1776.91\pm0.12 ^{+0.10}_{-0.13}$) MeV/$c^2$, which is currently the most precise value in a single measurement.

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