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.

Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2023). Measurement of the τ-lepton mass with the Belle II experiment. PHYSICAL REVIEW D, 108(3), 032006-1-032006-9 [10.1103/PhysRevD.108.032006].

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

Branchini, P.
Membro del Collaboration Group
;
Budano, A.
Membro del Collaboration Group
;
Bussino, S.
Membro del Collaboration Group
;
De Pietro, G.
Membro del Collaboration Group
;
Laurenza, M.
Membro del Collaboration Group
;
Martellini, C.
Membro del Collaboration Group
;
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
Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., et al. (2023). Measurement of the τ-lepton mass with the Belle II experiment. PHYSICAL REVIEW D, 108(3), 032006-1-032006-9 [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/11590/448127
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