Precision measurement of the mass of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>τ</mml:mi></mml:mrow></mml:math>lepton
Precision measurement of the mass of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>τ</mml:mi></mml:mrow></mml:math>lepton
An energy scan near the $\ensuremath{\tau}$ pair production threshold has been performed using the BESIII detector. About $24\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of data, distributed over four scan points, were collected. This analysis is based on $\ensuremath{\tau}$ pair decays to $ee$, $e\ensuremath{\mu}$, $eh$, $\ensuremath{\mu}\ensuremath{\mu}$, $\ensuremath{\mu}h$, $hh$, $e\ensuremath{\rho}$, $\ensuremath{\mu}\ensuremath{\rho}$ and $\ensuremath{\pi}\ensuremath{\rho}$ final states, …