Speaker
Steven Robertson
(IPP / University of Alberta)
Description
The $\tau$ lifetime is a fundamental parameter in the Standard Model, providing an important contribution to the test of lepton-flavour universality. The first run of the Belle II experiment collected a 365 fb$^{-1}$ sample of $e^{+}e^{-}$ collisions at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance, delivering around 340 million $e^{+}e^{-} \rightarrow \tau^{+}\tau^{-}$ events. The tiny beam spot size at the interaction point of these collisions, which is unique to the nano-beam scheme of the SuperKEKB accelerator, allows for a novel method for measuring the $\tau$ lifetime in the 1x3 prong topology. We present the first results from Belle II using this novel method.
Author
Steven Robertson
(IPP / University of Alberta)
