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Measurement of D0-D0 mixing parameters in D0 --> Ks pi+ pi- decays |
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| Authors: | Zhang L M Zhang Z P Adachi I Aihara H Aulchenko V Aushev T Bakich A M Balagura V Barberio E Bay A Belous K Bitenc U Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang P Chao Y Chen A Chen K-F Chen W T Cheon B G Chiang C-C Cho I-S Choi Y Choi Y K Dalseno J Danilov M Dash M Drutskoy A Eidelman S Epifanov D Fratina S Gabyshev N Gokhroo G Golob B Ha H Haba J Hara T Hastings N C Hayasaka K Hayashii H Hazumi M Heffernan D Hokuue T Hoshi Y Hou W-S Hsiung Y B Hyun H J Iijima T Ikado K Inami K Ishikawa A Ishino H Itoh R Iwasaki M Iwasaki Y Joshi N J Kah D H Kaji H Kajiwara S Kang J H Kawai H |
| Affiliation: | University of Science and Technology of China, Hefei. |
| Abstract: | We report a measurement of D0-D(0) mixing parameters in D(0) --> K(s)(0) pi(+) pi(-) decays using a time-dependent Dalitz-plot analysis. We first assume CP conservation and subsequently allow for CP violation. The results are based on 540 fb(-1) of data accumulated with the Belle detector at the KEKB e(+)e(-) collider. Assuming negligible CP violation, we measure the mixing parameters x = (0.80 +/- 0.29(-0.07-0.14)(+0.09+0.10))% and y = (0.33+/-0.24(-0.12-0.08)(+0.08+0.06))%, where the errors are statistical, experimental systematic, and systematic due to the Dalitz decay model, respectively. Allowing for CP violation, we obtain the CP-violating parameters |q / p| = 0.86(-0.29-0.03)(+0.30+0.06) +/- 0.08 and arg(q/p) = (-14(-18-3-4)(+16+5+2)) degrees . |
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