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.

Measurement of the τ-lepton mass with the Belle II experiment

Gabrielli, A.;Ganiev, E.;Ghosh, D.;Lanceri, L.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, L.;
2023-01-01

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.
2023
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https://journals.aps.org/prd/abstract/10.1103/PhysRevD.108.032006
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3068805
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