Search for CP Violation in tau(+/-) -> K-S(0)pi(+/-)nu(tau) Decays at Belle

/ Authors

M. Bischofberger, H. Hayashii, K. Adamczyk, H. Aihara, V. Aulchenko, A. Bakich, V. Balagura, E. Barberio, K. Belous, A. Bozek

and 106 more authors

M. Bračko, T. Browder, P. Chen, B. Cheon, C. Chiang, I. Cho, K. Cho, Y. Choi, M. Danilov, Z. Doležal, A. Drutskoy, S. Eidelman, D. Epifanov, B. Golob, H. Ha, J. Haba, K. Hayasaka, Y. Horii, Y. Hoshi, W. Hou, Y. Hsiung, H. Hyun, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Julius, J. Kang, H. Kawai, T. Kawasaki, C. Kiesling, H. Kim, M. Kim, Y. Kim, K. Kinoshita, B. Ko, P. Kodys, P. Križan, Y. Kwon, S. Kyeong, J. Lange, M. Lee, S. Lee, J. Li, Y. Li, C. Liu, R. Louvot, J. Macnaughton, S. Mconie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. Mohanty, A. Moll, Takashi Mori, Y. Nagasaka, E. Nakano, M. Nakao, H. Nakazawa, S. Nishida, K. Nishimura, O. Nitoh, T. Ohshima, S. Okuno, G. Pakhlova, H. Park, H. Park, M. Petrić, L. Piilonen, M. Rohrken, S. Ryu, H. Sahoo, Y. Sakai, O. Schneider, C. Schwanda, K. Senyo, M. Shapkin, J. Shiu, B. Shwartz, F. Simon, P. Smerkol, Y. Sohn, S. Stanič, M. Starič, T. Sumiyoshi, Y. Teramoto, K. Trabelsi, S. Uehara, T. Uglov, S. Uno, G. Varner, A. Vinokurova, A. Vossen, C. Wang, P. Wang, M. Watanabe, Y. Watanabe, E. Won, H. Yamamoto, Y. Yamashita, C. Yuan, P. Zhou, V. Zhulanov, T. Živko

/ Abstract

We report on a search for CP violation in tau(+/-) -> K-S(0)pi(+/-)nu(tau) decays using a data sample of 699 fb(-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 K-S(0)pi(+/-) 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(eta(S)) are given at the 90% confidence level. These limits are |Im(eta(S))| < 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.

Journal: Physical Review Letters

DOI: 10.1103/PhysRevLett.107.131801