BaBar Collaboration-猫眼课题宝

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2004

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D. Boutigny;F. Couderc;J. Gaillard;A. Hicheur;Y. Karyotakis;J. Lees;V. Tisserand;A. Zghiche-A.-Zg

B→D(∗)D(∗)型衰变可以用来测量单位三角的参数sin2β，它与由模式B0→J/ψK0 S得到的参数sin2互补。本文报道了用BABA探测器测量了衰变的B0→D∗+D∗−的支化分数和CP宇称含量。根据1999年至2000年在Υ(4S)共振时获得的积分光度为20.7fB的数据，我们确定其分支分数为B(B0→D∗+D∗−)=(8.0±1.6(STAT)±1.2(SYST))×10−4。测得奇数CP宇称分量的比例为0.22±0.18(STAT)±0.03(SYST)。报道了在衰变模式B0→D∗+D−和B+→D∗+D∗0中观察到的大量候选态。本笔记中的所有结果都是初步的。提交给第9届重口味物理国际研讨会，2001年9月10日至9月13日，加利福尼亚州帕萨迪纳，美国斯坦福大学直线加速器中心，斯坦福，加州94309工作部分由能源部合同DE-AC03-76SF00515支持。首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容安装首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容

Decays of the type B → D(∗)D(∗) can be used to provide a measurement of the parameter sin2β of the Unitarity Triangle that is complementary to that derived from the mode B0 → J/ψK0 S . Here we report a measurement of the branching fraction and a study of the CP parity content for the decay B0 → D∗+D∗− with the BABAR detector. With data corresponding to an integrated luminosity of 20.7 fb collected at the Υ (4S) resonance during 1999-2000, we determine the branching fraction to be B(B0 → D∗+D∗−) = (8.0 ± 1.6(stat) ± 1.2(syst)) × 10−4. The measured fraction of the component with odd CP parity is 0.22 ± 0.18(stat) ± 0.03(syst). Observation of a significant number of candidates in the decay modes B0 → D∗+D− and B+ → D∗+D∗0 is reported. All results presented in this note are preliminary. Submitted to the 9th International Symposium On Heavy Flavor Physics, 9/10—9/13/2001, Pasadena, CA, USA Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 Work supported in part by Department of Energy contract DE-AC03-76SF00515. The BABAR Collaboration, B. Aubert, D. Boutigny, J.-M. Gaillard, A. Hicheur, Y. Karyotakis, J. P. Lees, P. Robbe, V. Tisserand Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France A. Palano, A. Pompili Università di Bari, Dipartimento di Fisica and INFN, I-70126 Bari, Italy G. P. Chen, J. C. Chen, N. D. Qi, G. Rong, P. Wang, Y. S. Zhu Institute of High Energy Physics, Beijing 100039, China G. Eigen, B. Stugu University of Bergen, Inst. of Physics, N-5007 Bergen, Norway G. S. Abrams, A. W. Borgland, A. B. Breon, D. N. Brown, J. Button-Shafer, R. N. Cahn, A. R. Clark, M. S. Gill, A. V. Gritsan, Y. Groysman, R. G. Jacobsen, R. W. Kadel, J. Kadyk, L. T. Kerth, Yu. G. Kolomensky, J. F. Kral, C. LeClerc, M. E. Levi, G. Lynch, P. J. Oddone, A. Perazzo, M. Pripstein, N. A. Roe, A. Romosan, M. T. Ronan, V. G. Shelkov, A. V. Telnov, W. A. Wenzel Lawrence Berkeley National Laboratory and University of California, Berkeley, CA 94720, USA P. G. Bright-Thomas, T. J. Harrison, C. M. Hawkes, D. J. Knowles, S. W. O’Neale, R. C. Penny, A. T. Watson, N. K. Watson University of Birmingham, Birmingham, B15 2TT, United Kingdom T. Deppermann, K. Goetzen, H. Koch, M. Kunze, B. Lewandowski, K. Peters, H. Schmuecker, M. Steinke Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany J. C. Andress, N. R. Barlow, W. Bhimji, N. Chevalier, P. J. Clark, W. N. Cottingham, N. De Groot, N. Dyce, B. Foster, J. D. McFall, D. Wallom, F. F. Wilson University of Bristol, Bristol BS8 1TL, United Kingdom K. Abe, C. Hearty, T. S. Mattison, J. A. McKenna, D. Thiessen University of British Columbia, Vancouver, BC, Canada V6T 1Z1 S. Jolly, A. K. McKemey, J. Tinslay Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom V. E. Blinov, A. D. Bukin, D. A. Bukin, A. R. Buzykaev, V. B. Golubev, V. N. Ivanchenko, A. A. Korol, E. A. Kravchenko, A. P. Onuchin, A. A. Salnikov, S. I. Serednyakov, Yu. I. Skovpen, V. I. Telnov, A. N. Yushkov Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia D. Best, A. J. Lankford, M. Mandelkern, S. McMahon, D. P. Stoker University of California at Irvine, Irvine, CA 92697, USA A. Ahsan, K. Arisaka, C. Buchanan, S. Chun University of California at Los Angeles, Los Angeles, CA 90024, USA 1 Also with Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom

BaBar Collaboration

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