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. 2002 Dec 16;89(25):251803.
doi: 10.1103/PhysRevLett.89.251803. Epub 2002 Dec 3.

Measurement of the B(0)-B(0) mixing parameter Deltam(d) using semileptonic B0 decays

K Hara  1 , M Hazumi, K Abe, K Abe, T Abe, I Adachi, Byoung Sup Ahn, H Aihara, M Akatsu, Y Asano, T Aso, V Aulchenko, T Aushev, A M Bakich, Y Ban, A Bay, I Bedny, P K Behera, I Bizjak, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, B C K Casey, P Chang, Y Chao, K-F Chen, B G Cheon, R Chistov, S-K Choi, Y Choi, Y K Choi, M Danilov, L Y Dong, J Dragic, S Eidelman, V Eiges, Y Enari, C W Everton, F Fang, C Fukunaga, N Gabyshev, A Garmash, T Gershon, B Golob, R Guo, J Haba, K Hanagaki, F Handa, T Hara, N C Hastings, H Hayashii, E M Heenan, I Higuchi, T Higuchi, L Hinz, Y Hoshi, W-S Hou, Y B Hsiung, S-C Hsu, H-C Huang, T Igaki, Y Igarashi, T Iijima, K Inami, A Ishikawa, R Itoh, H Iwasaki, Y Iwasaki, H K Jang, H Kakuno, J H Kang, J S Kang, N Katayama, H Kawai, Y Kawakami, N Kawamura, H Kichimi, D W Kim, Heejong Kim, H J Kim, Hyunwoo Kim, T H Kim, K Kinoshita, S Korpar, P Krizan, P Krokovny, R Kulasiri, S Kumar, A Kuzmin, Y-J Kwon, J S Lange, G Leder, S H Lee, J Li, R-S Lu, J MacNaughton, G Majumder, F Mandl, T Matsuishi, S Matsumoto, T Matsumoto, K Miyabayashi, Y Miyabayashi, H Miyata, G R Moloney, T Mori, T Nagamine, Y Nagasaka, T Nakadaira, E Nakano, M Nakao, J W Nam, Z Natkaniec, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, Y Onuki, W Ostrowicz, H Ozaki, H Palka, C W Park, H Park, L S Peak, J-P Perroud, M Peters, L E Piilonen, N Root, M Rozanska, K Rybicki, H Sagawa, S Saitoh, Y Sakai, H Sakamoto, M Satapathy, A Satpathy, O Schneider, S Schrenk, C Schwanda, S Semenov, K Senyo, R Seuster, M E Sevior, H Shibuya, B Shwartz, J B Singh, N Soni, S Stanic, M Staric, A Sugi, A Sugiyama, K Sumisawa, T Sumiyoshi, K Suzuki, S Suzuki, S Y Suzuki, T Takahashi, F Takasaki, N Tamura, J Tanaka, M Tanaka, G N Taylor, Y Teramoto, S Tokuda, M Tomoto, T Tomura, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, K Ueno, Y Unno, S Uno, Y Ushiroda, G Varner, K E Varvell, C C Wang, C H Wang, J G Wang, M-Z Wang, Y Watanabe, E Won, B D Yabsley, Y Yamada, A Yamaguchi, Y Yamashita, M Yamauchi, H Yanai, M Yokoyama, Y Yuan, Y Yusa, Z P Zhang, V Zhilich, D Zontar; Belle
Affiliations

Measurement of the B(0)-B(0) mixing parameter Deltam(d) using semileptonic B0 decays

K Hara et al. Phys Rev Lett. .

Abstract

We present a measurement of the B0-Bmacr;(0) mixing parameter Deltam(d) using neutral B meson pairs in a 29.1 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We exclusively reconstruct one neutral B meson in the semileptonic B0-->D(*-)l(+)nu decay mode and identify the flavor of the accompanying B meson from its decay products. From the distribution of the time intervals between the two flavor-tagged B meson decay points, we obtain Deltam(d)=(0.494+/-0.012+/-0.015) ps(-1), where the first error is statistical and the second error is systematic.

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