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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 99, p. -

Measurement of the τ lepton mass and an upper limit on the mass difference between τ+ and τ-

Belous K., Shapkin M., Sokolov A., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Barberio E., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Cole S., Dalseno J., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Fujikawa M., Gabyshev N., Gershon T., Gokhroo G., Golob B., Ha H., Haba J., Hasegawa Y., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kaji H., Kang J. H., Kapusta P., Katayama N., Kawasaki T., Khan H. R., Kichimi H., Kim Y. J., Križan P., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J., Lee M. J., Lee S. E., Lesiak T., Lin S. W., Liventsev D., Majumder G., Mandl F., Matsumoto T., Matyja A., McOnie S., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S.

The mass of the τ lepton has been measured in the decay mode τ→3πντ using a pseudomass technique. The result obtained from 414fb-1 of data collected with the Belle detector is Mτ=[1776.61±0. 13(stat)±0.35(sys)]MeV/c2. The upper limit on the relative mass difference between positive and negative τ leptons is |Mτ+-Mτ-|/ Mτ<2.8×10-4 at 90% confidence level. © 2007 The American Physical Society.