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  • tau$ lepton mass measurement at Belle II
    Adamczyk, K; Aloisio, A; Ky, N. Anh; Atmacan, H; Aushev, T; Bender, M; Bhardwaj, V; Bonvicini, G; Bozek, A; Budano, A; Bussino, S; Campajola, M; Cecchi, C; Chang, M. -C; Chen, Y. -T; Cheon, B. G; Chilikin, K; Cho, H. -E; Cho, S. -J; Cunliffe, S; Czank, T; De Nardo, G; De Pietro, G; Deschamps, B; Doležal, Z; Eliachevitch, M; Fiore, S; Fischer, P; Gellrich, A; Gobbo, B; Hohmann, M; Joo, K. K; Kim, Y; Kirby, B; Koga, T; Komarov, I; Korpar, S; Kroeger, R; Kumara, K; Künzel, M; Lanceri, L; Li, C; Li, L. K; Li, S. X; Libby, J; Lieret, K; Gioi, L. Li; Liu, Z. A; Luetticke, F; Maity, S; Manfredi, R; Matsuda, T; Miller, C; Miyata, H; Moon, T; Muroyama, G; Nakazawa, H; Natkaniec, Z; Nishida, S; Nouxman, M. H. A; Oxford, E. R; Pakhlova, G; Paoloni, E; Park, S. -H; Paschen, B; Patra, S; Paul, S; Polat, G; Reiter, S; Rout, N; Sahoo, D; Sangal, A; Schreeck, H; Schueler, J; Selce, A; Shibuya, H; Shiu, J. -G; Singh, J. B; Smith, K; Soloviev, Y; Starič, M; Stypula, J; Sumisawa, K; Tanaka, S; Taniguchi, N; Taras, P; Torassa, E; Tsuzuki, N; Usov, Y; Varvell, K. E; Vorobyev, V; Vossen, A; Abdullah, W. Wan; Wang, B; Wang, X. L; Warburton, A; Windel, H; Xu, X. P; Yeo, I; Yin, J. H

    08/2020
    Journal Article

    The reconstruction of tau-pair production, $e^{+}e^{-} \to \tau^{+}\tau^{-}$, from the subsequent 3-prong ($\tau^{+} \rightarrow \pi^{+} \pi^{-} \pi^{+} \bar{\nu}_{\tau}$) and 1-prong ($\tau^{-} \to \ell^{-} \bar{\nu}_{\ell} \nu_{\tau}$, $\tau^{-} \to h^{-} \nu_{\tau}$ or $\tau^{-} \to \pi^{-} \pi^0 \nu_{\tau}$) decays, is presented using 8.8 fb$^{-1}$ of $e^{+}e^{-}$ collision data of Belle II at the center-of-mass energy $\sqrt{s} = m_{\Upsilon(4S)}$. The pseudomass technique developed by the ARGUS experiment is used to measure the $\tau$-lepton mass $m_{\tau}$ in the 3-prong $\tau^{+} \to \pi^{+} \pi^{-} \pi^{+} \bar{\nu}_{\tau} $ decay, resulting in $m_{\tau} = 1777.28 \pm 0.75~{\rm (stat.)} \pm 0.33 ~{\rm (sys.)}~{\rm{MeV}/\rm{c}^2}$.

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