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

Bischofberger, M.; Hayashii, H.; Adamczyk, K.; Aihara, H.; Aulchenko, V.; Bakich, A. M.; Balagura, V.; Barberio, E.; Belous, K.; Bozek, A.; Bracko, M.; Browder, T. E.; Chen, P.; Cheon, B. G.; Chiang, C.-C.; Cho, I.-S.; Cho, K.; Choi, Y.; Danilov, M.; Dolezal, 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.; Kodys, P.; Krizan, 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.; Petric, M.; Piilonen, L. E.; Roehrken, M.; Ryu, S.; Sahoo, H.; Sakai, Y.; Schneider, O.; Schwanda, C.; Senyo, K.; Shapkin, M.; Shiu, J.-G.; Shwartz, B.; Simon, F.; Smerkol, P.; Sohn, Y.-S.; Stanic, S.; Staric, M.; Sumiyoshi, T.; Teramoto, Y.; Trabelsi, K.; Uehara, S.

doi:10.1103/PhysRevLett.107.131801

research article

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

Bischofberger, M.

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Hayashii, H.

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Adamczyk, K.

2011

Physical Review Letters

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.