Direct measurement of the branching fraction for D+→(K)over-bar0 μ+νμ and determination of Γ(D0→K-μ+ νμ)/Γ (D+→(K)over-bar0 μ+ νμ)

作者：Ablikim, M.; Bai, J. Z.; Ban, Y.; Cai, X.; Chen, H. F.; Chen, H. S.; Chen, H. X.; Chen, J. C.; Chen, Jin; Chen, Y. B.; Chu, Y. P.; Dai, Y. S.; Diao, L. Y.; Deng, Z. Y.; Dong, Q. F.; Du, S. X.; Fang, J.; Fang, S. S.; Fu, C. D.; Gao, C. S.; Gao, Y. N.; Gu, S. D.; Gu, Y. T.; Guo, Y. N.; He, K. L.; He, M.; Heng, Y. K.; Hou, J.; Hu, H. M.; Hu, J. H.; Hu, T.; Huang, X. T.; Ji, X. B.; Jiang, X. S.; Jiang, X. Y.; Jiao, J. B.; Jin, D. P.; Jin, S.; Lai, Y. F.; Li, G.; Li, H. B.; Li, J.; Li, R. Y.

来源：Physics Letters B, 2007, 644(1): 20-24.

DOI：10.1016/j.physletb.2006.11.026

The absolute branching fraction for the decay D+ -> (K) over bar (0)mu+nu(mu) is determined using 5321 +/- 149 +/- 160 singly tagged D- sample from the data collected around root s = 3.773 GeV with the BESII detector at the BEPC collider. In the system recoiling against the singly tagged D- mesons, 28.7 +/- 6.4 events for D+ -> (K) over bar (0)mu+nu(mu) are observed. These yield the absolute branching fraction to be BF(D+ -> (K) over bar0(mu)+nu(mu)) (10.3 +/- 2.3 +/- 0.8)%. The ratio of the two partial widths for the decays D-0 -> K-mu+nu(mu) and D+ -> (K) over bar (-)mu+nu(mu) is determined to be Gamma(D-0 -> K-mu+nu(mu))/Gamma(D+ -> (K) over bar (0)mu+nu(mu)) = 0.87 +/- 0.24 +/- 0.15.

• 出版日期2007-1-4
• 单位广西师范大学; 湖南大学; 辽宁大学; 四川大学; 南京师范大学; 暨南大学; 山东大学; 南开大学; 中国科学技术大学; 清华大学; 河南师范大学; 华中师范大学; 广西大学; 北京大学; 中国高等科学技术中心; 浙江大学; 武汉大学