Evidence for CP Violation in the Decay $D^+\rightarrow K^0_S\pi^+$

A. Bondar; A. Bozek; A. Chen; A. Ishikawa; A. J. Schwartz; A. Kuzmin; A. M. Bakich; A. Moll; A. Poluektov; A. Sibidanov

Evidence for CP Violation in the Decay D^+rightarrow K⁰_Sπ^+

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arxiv 1203.6409 v4 pith:53FMC4PL submitted 2012-03-29 hep-ex

Evidence for CP Violation in the Decay D^+rightarrow K⁰_Sπ^+

B. R. Ko , E. Won , I. Adachi , H. Aihara , D. M. Asner , V. Aulchenko , T. Aushev , T. Aziz

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A. M. Bakich K. Belous V. Bhardwaj B. Bhuyan M. Bischofberger A. Bondar G. Bonvicini A. Bozek M. Bra\v T. E. Browder M.-C. Chang A. Chen P. Chen B. G. Cheon K. Chilikin I.-S. Cho K. Cho Y. Choi Z. Dole\v Z. Dr\'asal S. Eidelman J. E. Fast V. Gaur N. Gabyshev Y. M. Goh B. Golob J. Haba K. Hayasaka H. Hayashii Y. Horii Y. Hoshi W.-S. Hou H. J. Hyun T. Iijima A. Ishikawa R. Itoh M. Iwabuchi Y. Iwasaki T. Iwashita T. Julius J. H. Kang T. Kawasaki C. Kiesling H. O. Kim J. B. Kim K. T. Kim M. J. Kim Y. J. Kim K. Kinoshita S. Koblitz P. Kody\v S. Korpar P. Kri\v P. Krokovny T. Kuhr A. Kuzmin Y.-J. Kwon J. S. Lange S.-H. Lee J. Li Y. Li J. Libby C.-L. Lim C. Liu Y. Liu Z. Q. Liu D. Liventsev R. Louvot Y. Miyazaki R. Mizuk G. B. Mohanty A. Moll T. Mori N. Muramatsu Y. Nagasaka E. Nakano M. Nakao H. Nakazawa Z. Natkaniec S. Nishida K. Nishimura O. Nitoh S. Ogawa T. Ohshima S. Okuno S. L. Olsen Y. Onuki W. Ostrowicz P. Pakhlov G. Pakhlova C. W. Park H. K. Park K. S. Park T. K. Pedlar R. Pestotnik M. Petri\v L. E. Piilonen A. Poluektov M. Ritter M. R\"ohrken S. Ryu H. Sahoo K. Sakai Y. Sakai T. Sanuki Y. Sato O. Schneider C. Schwanda A. J. Schwartz R. Seidl K. Senyo M. E. Sevior M. Shapkin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon P. Smerkol Y.-S. Sohn A. Sokolov E. Solovieva S. Stani\v M. Stari\v T. Sumiyoshi S. Tanaka G. Tatishvili Y. Teramoto K. Trabelsi T. Tsuboyama M. Uchida S. Uehara Y. Unno S. Uno G. Varner K. E. Varvell A. Vinokurova V. Vorobyev C. H. Wang P. Wang X. L. Wang M. Watanabe Y. Watanabe H. Yamamoto Y. Yamashita C. Z. Yuan C. C. Zhang Z. P. Zhang V. Zhulanov A. Zupanc (for the Belle Collaboration)

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We observe evidence for CP violation in the decay $D^+\rightarrow K^0_S\pi^+$ using a data sample with an integrated luminosity of 977 fb$^{-1}$ collected by the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. The CP asymmetry in the decay is measured to be $(-0.363\pm0.094\pm0.067)%$, which is 3.2 standard deviations away from zero, and is consistent with the expected CP violation due to the neutral kaon in the final state.

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