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Observation of tau(-) -> pi(-)nu(tau)e(+)e(-) and search for tau(-) -> pi(-)nu(tau)mu(+)mu(-)

Authors
Jin, Y.Aihara, H.Epifanov, D.Adachi, IAl Said, S.Asner, D. M.Aulchenko, VAushev, T.Ayad, R.Babu, VBadhrees, IBahinipati, S.Bansal, VBehera, P.Berger, M.Bhardwaj, VBilka, T.Biswal, J.Bobrov, A.Bonvicini, G.Bozek, A.Bracko, M.Campajola, M.Cao, L.Cervenkov, D.Chekelian, VChen, A.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Choi, Y.Choudhury, S.Cinabro, D.Cunliffe, S.Di Carlo, S.Dolezal, Z.Dong, T., VDossett, D.Eidelman, S.Fast, J. E.Ferber, T.Fulsom, B. G.Garg, R.Gaur, VGabyshev, N.Garmash, A.Giri, A.Goldenzweig, P.Golob, B.Greenwald, D.Grzymkowska, O.Haba, J.Hayasaka, K.Hayashii, H.Hedges, M. T.Hou, W-SHuang, K.Iijima, T.Inami, K.Inguglia, G.Ishikawa, A.Iwasaki, M.Iwasaki, Y.Jacobs, W. W.Jeon, H. B.Jia, S.Joffe, D.Joo, K. K.Kahn, J.Kaliyar, A. B.Karyan, G.Kawasaki, T.Kichimi, H.Kiesling, C.Kim, D. Y.Kim, H. J.Kim, K. T.Kim, S. H.Kinoshita, K.Kodys, P.Korpar, S.Kotchetkov, D.Krizan, P.Kroeger, R.Krokovny, P.Kulasiri, R.Kumar, R.Kuzmin, A.Kwon, Y-JLalwani, K.Lange, J. S.Lee, J. Y.Lee, S. C.Li, C. H.Li, L. K.Li, Y. B.Li Gioi, L.Libby, J.Lieret, K.Liptak, Z.Liventsev, D.Lu, P-CLuo, T.MacNaughton, J.Masuda, M.Matsuda, T.Matvienko, D.Merola, M.Miyabayashi, K.Miyata, H.Mizuk, R.Mori, T.Mussa, R.Nakano, E.Nakao, M.Nath, K. J.Natkaniec, Z.Nayak, M.Niiyama, M.Nisar, N. K.Nishida, S.Ogawa, S.Ono, H.Onuki, Y.Pakhlov, P.Pakhlova, G.Pal, B.Pardi, S.Park, H.Park, S-HPatra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Popov, VPrencipe, E.Purohit, M., VRostomyan, A.Russo, G.Sahoo, D.Sakai, Y.Salehi, M.Sandilya, S.Santelj, L.Sanuki, T.Savinov, VSchneider, O.Schnell, G.Schueler, J.Schwanda, C.Seino, Y.Senyo, K.Seon, O.Sevior, M. E.Shebalin, VShen, C. P.Shiu, J-GShwartz, B.Simon, F.Singh, J. B.Sokolov, A.Solovieva, E.Stanic, S.Staric, M.Stottler, Z. S.Strube, J. F.Sumiyoshi, T.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Trabelsi, K.Uchida, M.Uglov, T.Unno, Y.Uno, S.Urquijo, P.Usov, Y.Van Tonder, R.Varner, G.Vinokurova, A.Vorobyev, V.Vossen, A.Wang, B.Wang, C. H.Wang, M-ZWang, P.Watanuki, S.Won, E.Yang, S. B.Ye, H.Yin, J. H.Yuan, C. Z.Yusa, Y.Zhang, Z. P.Zhilich, VZhukova, V
Issue Date
15-10월-2019
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v.100, no.7
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW D
Volume
100
Number
7
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/62510
DOI
10.1103/PhysRevD.100.071101
ISSN
2470-0010
Abstract
We present the first measurements of branching fractions of rare tau-lepton decays, tau(-) -> pi(-)nu(tau)l(+)l(-) (l = e or mu), using a data sample corresponding to 562 fb(-1) collected at a center-of-mass energy of 10.58 GeV with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The tau(-) -> pi(-)nu(tau)e(+)e(-) decay is observed for the first time with 7.0 sigma significance. The partial branching fraction determined by the structure-dependent mechanisms mediated by either a vector or an axial-vector current for the mass region M-pi ee > 1.05 GeV/c(2) is measured to be B(tau(-) -> pi(-)nu(tau)e(+)e(-))[M pi-e+e- > 1.05 GeV/c(2)] = (5.90 +/- 0.53 +/- 0.85 +/- 0.11) x 10(-6), where the first uncertainty is statistical, the second is systematic, and the third is due to model dependence. In the full phase space, due to the different detection efficiencies for the structure-dependent mechanisms mediated by axial-vector and vector currents, the branching fraction varies from B-A(tau(-) -> pi(-)nu(tau)e(+)e(-)) = (1.46 +/- 0.13 +/- 0.21) x 10(-5) to B-V(tau(-) -> pi(-)nu(tau)e(+)e(-)) = (3.01 +/- 0.27 +/- 0.43) x 10(-5), respectively. An upper limit is set on the branching fraction of the tau(-) -> pi(-)nu(tau)mu(+)mu(-) decay, B(tau(-) -> pi(-)nu(tau)mu(+)mu(-)) < 1.14 x 10(-5), at the 90% confidence level.
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