Measurement of the τ -lepton mass with the Belle II experiment
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Date
2023-08-01, 2023-08-08
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American Physical Society
Abstract
We present a measurement of the τ-lepton mass using a sample of about 175 million e+e-→τ+τ- events collected with the Belle II detector at the SuperKEKB e+e- collider at a center-of-mass energy of 10.579 GeV. This sample corresponds to an integrated luminosity of 190 fb-1. We use the kinematic edge of the τ pseudomass distribution in the decay τ-→π-π+π-ντ and measure the τ mass to be 1777.09±0.08±0.11 MeV/c2, where the first uncertainty is statistical and the second systematic. This result is the most precise to date.
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Keywords
5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences