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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2010, vol. 682, p. 355-362

Search for lepton flavor and lepton number violating τ decays into a lepton and two charged mesons

Miyazaki Y., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bhardwaj V., Bischofberger M., Bondar A., Bračko M., Browder T. E., Chang P., Chen A., Cheon B. G., Cho I. S., Choi Y., Dalseno J., Dash M., Dungel W., Eidelman S., Epifanov D., Feindt M., Gabyshev N., Garmash A., Goldenzweig P., Ha H., Haba J., Hara K., Hasegawa Y., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Itoh R., Iwasaki M., Iwasaki Y., Julius T., Kah D. H., Kang J. H., Kawai H., Kawasaki T., Kim H. O., Kim J. H., Kim S. K., Kim Y. I., Kim Y. J., Ko B. R., Korpar S., Križan P., Krokovny P., Kumar R., Kumita T., Kuzmin A., Kwon Y. J., Kyeong S. H., Lee S. H., Lesiak T., Li J., Liu C., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Nishida S., Nishimura K., Nitoh O., Ohshima T., Okuno S., Olsen S. L., Pakhlov P., Pakhlova G., Palka H.

We search for lepton flavor and lepton number violating τ decays into a lepton (ℓ = electron or muon) and two charged mesons (h, h′ = π± or K±), τ- → ℓ- h+ h′ - and τ- → ℓ+ h- h′ -, using 671 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. We obtain 90% C.L. upper limits on the branching fractions in the range (4.4 - 8.8) × 10- 8 for τ → e h h′, and (3.3 - 16) × 10- 8 for τ → μ h h′ processes. These results improve upon previously published upper limits by factors between 1.6 to 8.8. © 2009 Elsevier B.V. All rights reserved.