Search for lepton-flavor and lepton-number-violating decay modes

Authors :: Miyazaki, Y.
Hayasaka, K.
Adachi, I.
Aihara, H.
Asner, D.M.
Aulchenko, V.
Aushev, T.
Bakich, A.M.
Bay, A.
Bhardwaj, V.
Bhuyan, B.
Bischofberger, M.
Bozek, A.
Bračko, M.
Browder, T.E.
Chang, M.-C.
Chen, A.
Chen, P.
Cheon, B.G.
Chistov, R.
Source :: Physics Letters B. Feb2013, Vol. 719 Issue 4/5, p346-353. 8p.
Publication Year :: 2013
Abstract: Abstract: We search for lepton-flavor and lepton-number-violating τ decays into a lepton (ℓ= electron or muon) and two charged mesons ( or ) using of data collected with the Belle detector at the KEKB asymmetric-energy collider. We obtain 90% confidence level upper limits on the branching fractions in the range . These results improve upon our previously published upper limits by factors of about 1.8 on average. [Copyright &y& Elsevier]