Search for D0-D0 mixing in D0 --> K+ pi(-) decays and measurement of the doubly-Cabibbo-suppressed decay rate

We have searched for mixing in the D(0)-D (0) system by measuring the decay-time distribution of D(0) --> K(+) pi(-) decays. The analysis uses 90 fb(-1) of data collected by the Belle detector at the KEKB e(+) e(-) collider. We fit the decay-time distribution for the mixing parameters x' and...

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Published in:Physical review letters 2005-02, Vol.94 (7), p.071801-071801
Main Authors: Li, J, Zhang, Z P, Schwartz, A J, Abe, K, Aihara, H, Akatsu, M, Asano, Y, Aushev, T, Bakich, A M, Bay, A, Bedny, I, Bitenc, U, Bizjak, I, Bondar, A, Bozek, A, Bracko, M, Brodzicka, J, Browder, T E, Chao, Y, Chen, A, Chen, K-F, Chen, W T, Cheon, B G, Chistov, R, Choi, S-K, Choi, Y, Chuvikov, A, Cole, S, Dalseno, J, Danilov, M, Dash, M, Dong, L Y, Drutskoy, A, Eidelman, S, Eiges, V, Enari, Y, Fang, F, Fratina, S, Gabyshev, N, Garmash, A, Gershon, T, Gokhroo, G, Haba, J, Hayasaka, K, Hayashii, H, Hazumi, M, Higuchi, T, Hokuue, T, Hoshi, H, Hou, S, Hou, W-S, Iijima, T, Imoto, A, Inami, K, Itoh, R, Iwasaki, M, Iwasaki, Y, Kang, J H, Kang, J S, Kataoka, S U, Katayama, N, Kawai, H, Kawasaki, T, Khan, H R, Kim, J H, Kim, S K, Kinoshita, K, Krokovny, P, Kulasiri, R, Kuo, C C, Kwon, Y-J, Lange, L S, Leder, G, Lee, S H, Lesiak, T, Limosani, A, Lin, S-W, Liventsev, D, Macnaughton, J, Majumder, G, Mandl, F, Matsumoto, T, Matyja, A, Mitaroff, W, Miyata, H, Mizuk, R, Mohapatra, D, Mori, T, Nagamine, T, Nagasaka, Y, Nakadaira, T, Nakano, E, Nishida, S, Nitoh, O, Ogawa, S, Ohshima, T, Olsen, S L, Ostrowicz, W, Ozaki, H
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Summary:We have searched for mixing in the D(0)-D (0) system by measuring the decay-time distribution of D(0) --> K(+) pi(-) decays. The analysis uses 90 fb(-1) of data collected by the Belle detector at the KEKB e(+) e(-) collider. We fit the decay-time distribution for the mixing parameters x' and y' and also for the parameter R(D), which is the ratio of the rate for the doubly-Cabibbo-suppressed decay D(0)--> K+ pi(-) to that for the Cabibbo-favored decay D(0)--> K-pi(+). We do these fits both assuming CP conservation and allowing for CP violation. We use a frequentist method to obtain a 95% C.L. region in the x'(2) - y' plane. Assuming no mixing, we measure R(D) = (0.381 +/- 0.017(+0.008)(-0.016))%.
ISSN:0031-9007