Search for CP Violation in D0 → π0 π0 Decays

N. K. Nisar,B. Macek,Prafulla Kumar Behera,T. Iwashita,D. Liventsev,B. R. Ko,S.E. Vahsen, D. A. Epifanov,Y. Yook,R. Pestotnik,A. Bala,P.A. Lukin,T. Uglov,E. Won,D. Matvienko,Y. Choi,Sang Hoon Lee,J. Dalseno,Peter Kodys,H. Park,T. Sumiyoshi,S. Okuno,M. Ritter,A. Bobrov,G. B. Mohanty,K. Cho,B. G. Cheon,P. Wang,B. Golob,K. Arinstein,T. Iijima,A. Ishikawa,J. S. Lange, A. Bozek,J. Libby,Y. Watanabe,Y. J. Kwon,James E. Fast,L. Santelj,P. Vanhoefer,V.N. Zhilich,H. Hayashii,E. Ribezl, J. B. Kim,X. H. He, T. Peng,Y. Sakai,S. Korpar,Marko Petrič,S. Ogawa,T. Aushev,A. Rostomyan,G. Bonvicini,R. Mizuk,E. Solovieva,L. E. Piilonen,D. Y. Kim,T. K. Pedlar,G. S. Varner,P. Krizan,O. Schneider,M. Bračko,H. Farhat,V.M. Aulchenko,A. Moll,K. Kinoshita,M. Z. Wang,E. Nedelkovska,D. Dutta,I. Adachi,Tariq Aziz,O. Seon,M. E. Sevior,V. Bhardwaj,T. A. Shibata,K. Dutta,H. Miyata,O. Nitoh,S. Yashchenko,Y. S. Sohn,K. M. Williams,Y. Hoshi,K. Belous,T. Ferber,Z. P. Zhang,M. Nayak,G. Tatishvili,M. Steder,S.I. Eidelman,A. Abdesselam,Vladimir Zhulanov,R. Mussa,S. Uno,M. Nakao,C. Schwanda,H. Aihara,T. Sanuki,H. K. Park,M. Starič,T. Kawasaki

Physical Review Letters（2014）

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摘要

We search for CP violation in neutral charm meson decays using a data sample with an integrated luminosity of 966 fb(-1) collected with the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider. The asymmetry obtained in the rate of D-0 and (D) over bar (0) decays to the pi(0)pi(0) final state, [-0.03 +/- 0.64(stat) +/- 0.10(syst)]%, is consistent with no CP violation. This constitutes an order of magnitude improvement over the existing result. We also present an updated measurement of the CP asymmetry in the D-0 -> K-S(0)pi(0) decay: A(CP)(D-0 -> K-S(0)pi(0)) = [-0.21 +/- 0.16(stat) +/- 0.07(syst)]%.

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