Measurement of {D⁰}-{overline{D}{}⁰} Mixing and Search for Indirect CP Violation Using {D⁰to K_S⁰π^+π^-} Decays

Belle Collaboration: A. Abdesselam , I. Adachi , H. Aihara , K. Arinstein , D. M. Asner , V. Aulchenko , T. Aushev , R. Ayad

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A. M. Bakich A. Bala V. Bhardwaj B. Bhuyan A. Bobrov A. Bondar G. Bonvicini A. Bozek D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon I.-S. Cho K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno M. Danilov Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber O. Frost V. Gaur S. Ganguly A. Garmash R. Gillard Y. M. Goh B. Golob J. Haba T. Hara K. Hayasaka H. Hayashii X. H. He Y. Hoshi W.-S. Hou H. J. Hyun T. Iijima A. Ishikawa R. Itoh Y. Iwasaki T. Iwashita I. Jaegle T. Julius J. H. Kang E. Kato P. Katrenko H. Kawai T. Kawasaki H. Kichimi D. Y. Kim H. J. Kim J. B. Kim J. H. Kim M. J. Kim Y. J. Kim K. Kinoshita J. Klucar B. R. Ko P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny B. Kronenbitter T. Kuhr R. Kumar T. Kumita A. Kuzmin S.-H. Lee Y. Li L. Li Gioi J. Libby C. Liu Y. Liu Z. Q. Liu D. Liventsev P. Lukin H. Miyata R. Mizuk G. B. Mohanty A. Moll R. Mussa M. Nakao Z. Natkaniec M. Nayak E. Nedelkovska N. K. Nisar S. Nishida O. Nitoh S. Ogawa P. Pakhlov H. Park H. K. Park T. K. Pedlar R. Pestotnik M. Petri\v{c} L. E. Piilonen E. Ribe\v{z}l M. Ritter M. R\"ohrken A. Rostomyan H. Sahoo T. Saito Y. Sakai S. Sandilya D. Santel L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda R. Seidl D. Semmler K. Senyo M. E. Sevior M. Shapkin V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov E. Solovieva S. Stani\v{c} M. Stari\v{c} T. Sumiyoshi U. Tamponi G. Tatishvili Y. Teramoto K. Trabelsi M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda Y. Usov C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell A. Vinokurova V. Vorobyev M. N. Wagner C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe Y. Watanabe S. Wehle K. M. Williams E. Won Y. Yamashita S. Yashchenko Y. Yook C. Z. Yuan C. C. Zhang V. Zhilich V. Zhulanov A. Zupanc

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classification ✦ hep-ex

keywords mixingparametersviolationamplitudeconservationdecaysindirectmeasurement

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We report a measurement of ${D^{0}}$-${\overline{D}{}^{0}}$ mixing parameters and a search for indirect $CP$ violation through a time-dependent amplitude analysis of ${D^0\to K_S^0\pi^+\pi^-}$ decays. The results are based on 921~fb$^{-1}$ of data accumulated with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. Assuming $CP$ conservation, we measure the mixing parameters $x=(0.56\pm0.19^{+0.03}_{-0.09}{^{+0.06}_{-0.09}})\%$ and $y=(0.30\pm0.15^{+0.04}_{-0.05}{^{+0.03}_{-0.06})}\%$, where the errors are statistical, experimental systematic, and systematic due to the amplitude model, respectively. With $CP$ violation allowed, the parameters $|q/p|=0.90^{+0.16}_{-0.15}{^{+0.05}_{-0.04}}{^{+0.06}_{-0.05}}$ and $\arg(q/p)=(-6\pm11{\pm3}{^{+3}_{-4}})^{\circ}$ are found to be consistent with conservation of $CP$ symmetry in mixing and in the interference between mixing and decay, respectively.

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Measurement of {D⁰}-{overline{D}{}⁰} Mixing and Search for Indirect CP Violation Using {D⁰to K_S⁰π^+π^-} Decays

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