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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2008, vol. 664, p. 35-40

Search for lepton-flavor-violating τ → ℓ V0 decays at Belle

Nishio Y., Inami K., Ohshima T., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Balagura V., Barberio E., Bedny I., Belous K., Bitenc U., Blyth S., Bondar A., Bračko M., Browder T. E., Chen A., Chen W. T., Cheon B. G., Cho I. S., Choi Y., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Golob B.

We have searched for neutrinoless τ lepton decays into ℓ and V0, where ℓ stands for an electron or muon, and V0 for a vector meson (φ{symbol}, ω, K* 0, over(K, ̄)* 0 or ρ0), using 543 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No excess of signal events over the expected background has been observed, and we set upper limits on the branching fractions in the range (5.9 - 18) × 10-8 at the 90% confidence level. These upper limits are significantly more restrictive than our previous results for the ℓφ{symbol}, ℓ K* 0, ℓ over(K, ̄)* 0 and ℓ ρ0 modes. © 2008 Elsevier B.V.