Study of the B→X(3872)(→D^{*0}D[over ¯]^{0})K decay

T. Aushev,N. Zwahlen,I. Adachi, H. Aihara,A. M. Bakich,V. Balagura, A. Bay,K. Belous,V. Bhardwaj,M. Bischofberger,A. Bondar,A. Bozek,J. Brodzicka,T. E. Browder, Y. Chao,A. Chen,P. Chen,B. G. Cheon,C.-C. Chiang,R. Chistov,I.-S. Cho,S.-K. Choi,Y. Choi,J. Dalseno,M. Danilov,A. Drutskoy,S. Eidelman,N. Gabyshev, P. Goldenzweig,H. Ha, J. Haba,B.-Y. Han, H. Hayashii,Y. Hoshi,W.-S. Hou, H. J. Hyun, T. Iijima,K. Inami,R. Itoh, M. Iwabuchi,M. Iwasaki, Y. Iwasaki,N. J. Joshi,T. Julius,D. H. Kah,J. H. Kang,P. Kapusta, T. Kawasaki,H. J. Kim, H. O. Kim,J. H. Kim,Y. I. Kim,Y. J. Kim,B. R. Ko,S. Korpar,P. Križan,P. Krokovny, T. Kuhr,R. Kumar,Y.-J. Kwon,J. S. Lange,S.-H. Lee, J. Li,C. Liu,D. Liventsev,R. Louvot,A. Matyja,S. McOnie, T. Medvedeva, K. Miyabayashi,H. Miyata,Y. Miyazaki,R. Mizuk,E. Nakano, M. Nakao,Z. Natkaniec, S. Nishida,K. Nishimura,O. Nitoh,S. Ogawa,T. Ohshima,S. Okuno,S. L. Olsen,P. Pakhlov,G. Pakhlova,H. Palka,C. W. Park,H. Park,H. K. Park,R. Pestotnik,M. Petrič,L. E. Piilonen,S. Ryu,H. Sahoo,K. Sakai, Y. Sakai, O. Schneider,C. Schwanda,K. Senyo,M. Shapkin, C. P. Shen, J.-G. Shiu,B. Shwartz, J. B. Singh,P. Smerkol,A. Sokolov,E. Solovieva,M. Starič,T. Sumiyoshi,Y. Teramoto,I. Tikhomirov, K. Trabelsi, S. Uehara,T. Uglov, Y. Unno,S. Uno,Y. Usov, G. Varner,K. Vervink,C. H. Wang, P. Wang, Y. Watanabe,R. Wedd,J. Wicht,E. Won,B. D. Yabsley, Y. Yamashita,M. Yamauchi, C. Z. Yuan, Z. P. Zhang, V. Zhulanov,T. Zivko, A. Zupanc,O. Zyukova

PHYSICAL REVIEW D（2010）

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摘要

We present a study of B -> X(3872)K with X(3872) decaying to D*(0)(D) over bar (0) using a sample of 657 x 10(6) B (B) over bar pairs recorded at the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Both D*(0) -> D-0 gamma and D*(0) -> D-0 pi(0) decay modes are used. We find a peak of 50.1(-11.1)(+14.8) events with a mass of (3872.9(-0.4-0.5)(+0.6+0.4)) MeV/c(2), a width of d 3.9(-1.4-1.1)(+2.8+0.2)) MeV/c(2) and a product branching fraction B(B -> X(3872)K) X B(X(3872) -> D*(0)(D) over bar (0)) = (0.80 +/- 0.20 +/- 0.10) X 10(-4), where the first errors are statistical and the second ones are systematic. The significance of the signal is 6.4 sigma. The difference between the fitted mass and the D*(0)(D) over bar (0) threshold is calculated to be (1.1(-0.4-0.3)(+0.6+0.1)) MeV/c(2). We also obtain an upper limit on the product of branching fractions B(B -> Y(3940)K) X B(Y(3940) -> D*(0)(D) over bar (0) of 0.67 X 10(-4) at 90% CL.

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