Search for lepton-number- And baryon-number-violating tau decays at Belle

Date Issued
24-12-2020
Author(s)
Sahoo, D.
Mohanty, G. B.
Trabelsi, K.
Adachi, I.
Adamczyk, K.
Aihara, H.
Al Said, S.
Asner, D. M.
Aushev, T.
Ayad, R.
Aziz, T.
Babu, V.
Bahinipati, S.
Behera, P.
Bennett, J.
Bessner, M.
Bhardwaj, V.
Bilka, T.
Biswal, J.
Bonvicini, G.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
Campajola, M.
Cao, L.
ÄŒervenkov, D.
Chang, M. C.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Cho, H. E.
Cho, K.
Choi, S. K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
Das, S.
Dash, N.
De Nardo, G.
Di Capua, F.
Dingfelder, J.
DoleŽal, Z.
Dong, T. V.
Dubey, S.
Eidelman, S.
Epifanov, D.
Ferber, T.
Ferlewicz, D.
Frey, A.
Fulsom, B. G.
Garg, R.
Gaur, V.
Garmash, A.
Giri, A.
Goldenzweig, P.
Golob, B.
Guan, Y.
Gudkova, K.
Hadjivasiliou, C.
Halder, S.
Hara, T.
Hartbrich, O.
Hayasaka, K.
Hayashii, H.
Hedges, M. T.
Hernandez Villanueva, M.
Hou, W. S.
Hsu, C. L.
Huang, K.
Iijima, T.
Inami, K.
Inguglia, G.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jeon, H. B.
Jia, S.
Jin, Y.
Joo, C. W.
Joo, K. K.
Kaliyar, A. B.
Kang, K. H.
Karyan, G.
Kawasaki, T.
Kichimi, H.
Kiesling, C.
Kim, D. Y.
Kim, S. H.
Kim, Y. K.
Kinoshita, K.
Kodyš, P.
Konno, T.
Korpar, S.
Kotchetkov, D.
KriŽan, P.
DOI
Abstract
We search for lepton-number- and baryon-number-violating decays τ-→p¯e+e-, pe-e-, p¯e+μ-, p¯e-μ+, p¯μ+μ-, and pμ-μ- using 921 fb-1 of data, equivalent to (841±12)×106 τ+τ- events, recorded with the Belle detector at the KEKB asymmetric-energy e+e- collider. In the absence of a signal, 90% confidence-level upper limits are set on the branching fractions of these decays in the range (1.8-4.0)×10-8. We set the world's first limits on the first four channels and improve the existing limits by an order of magnitude for the last two channels.
Volume
102