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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2006, vol. 632, p. 51-57

Search for lepton and baryon number violating τ- decays into Λ̄π- and Λπ-

Miyazaki Y., Abe K., Abe K., Adachi I., Aihara H., Arinstein K., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Barberio E., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dong L. Y., Drutskoy A., Eidelman S., Enari Y., Epifanov D., Fratina S., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Gorišek A., Ha H. C., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim J. H., Kim S. K., Kim S. M., Korpar S., Križan P., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lee S. E., Lesiak T., Lin S. W., Liventsev D., Majumder G., Mandl F., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyabayashi K., Miyake H.

We have searched for τ lepton decays, τ-→Λ̄π- and τ-→Λπ-, that simultaneously violate the conservation of the lepton (L) and baryon (B) number using a data sample of 154 fb-1 collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. No evidence for a signal was found in either of the decay modes and we set the following upper limits for the branching fractions: B(τ-→Λ̄π-) <1.4×10-7 and B(τ-→Λπ-)<0.72×10-7 at the 90% confidence level. This is the first search ever performed for these modes. © 2005 Elsevier B.V. All rights reserved.