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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2013, vol. 719, p. 346-353

Search for lepton-flavor and lepton-number-violating Τ→ℓhh' decay modes

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., Cho K., Choi Y., Dalseno J., Doležal Z., Drutskoy A., Eidelman S., Epifanov D., Fast J. E., Gaur V., Gabyshev N., Garmash A., Goh Y. M., Haba J., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Itoh R., Iwabuchi M., Iwasaki Y., Julius T., Kang J. H., Kiesling C., Kim H. J., Kim H. O., Kim K. T., Kim M. J., Kim Y. J., Ko B. R., Koblitz S., Kodyš P., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Lee S. H., Li Y., Lim C. L., Liu C., Liu Z. Q., Liventsev D., Louvot R., Matvienko D., McOnie S., Miyabayashi K., Miyata H., Mizuk R., Mohanty G. B., Moll A., Muramatsu N., Nakano E., Nakao M., Nishida S., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S., Onuki Y., Pakhlov P., Pakhlova G.

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±) using 854 fb<sup>-1</sup> of data collected with the Belle detector at the KEKB asymmetric-energy e<sup>+</sup>e<sup>-</sup> collider. We obtain 90% confidence level upper limits on the. Τ→ℓhh' branching fractions in the range. (2.0-8.4)×10<sup>-8</sup>. These results improve upon our previously published upper limits by factors of about 1.8 on average. © 2013 Elsevier B.V.