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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2011, vol. 107, p. -

Search for CP violation in τ±→KS0π ±ντ decays at Belle

Bischofberger M., Hayashii H., Adamczyk K., Aihara H., Aulchenko V., Bakich A. M., Balagura V., Barberio E., Belous K., Bozek A., Bračko M., Browder T. E., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Cho K., Choi Y., Danilov M., Doležal Z., Drutskoy A., Eidelman S., Epifanov D., Golob B., Ha H., Haba J., Hayasaka K., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Inami K., Ishikawa A., Itoh R., Iwabuchi M., Iwasaki Y., Julius T., Kang J. H., Kawai H., Kawasaki T., Kiesling C., Kim H. O., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Križan P., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li J., Li Y., Liu C., Louvot R., MacNaughton J., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Mohanty G. B., Moll A., Mori T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Nishida S., Nishimura K., Nitoh O., Ohshima T., Okuno S., Pakhlova G., Park H., Park H. K., Petrič M., Piilonen L. E., Röhrken M., Ryu S., Sahoo H., Sakai Y., Schneider O., Schwanda C., Senyo K., Shapkin M., Shiu J. G., Shwartz B., Simon F.

We report on a search for CP violation in τ±→ KS0π±ντ decays using a data sample of 699fb-1 collected by the Belle experiment at the KEKB electron-positron asymmetric-energy collider. The CP asymmetry is measured in four bins of the invariant mass of the KS0π± system and found to be compatible with zero with a precision of O(10-3) in each mass bin. Limits for the CP violation parameter Im(ηS) are given at the 90% confidence level. These limits are |Im(ηS)|<0.026 or better, depending on the parametrization used to describe the hadronic form factors, and improve upon previous limits by 1 order of magnitude. © 2011 American Physical Society.