Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Phys Rev Lett. 2011 Nov 18;107(21):211801. doi: 10.1103/PhysRevLett.107.211801. Epub 2011 Nov 14.
The relative abundance of the three decay modes B(0)→D(-)K(+), B(0)→D(-)π(+), and B(s)(0)→D(s)(-)π(+) produced in 7 TeV pp collisions at the LHC is determined from data corresponding to an integrated luminosity of 35 pb(-1). The branching fraction of B(0)→D(-)K(+) is found to be B(B(0)→D(-)K(+)) = (2.01 ± 0.18(stat) ± 0.14(syst)) × 10(-4). The ratio of fragmentation fractions f(s)/f(d) is determined through the relative abundance of B(s)(0)→D(s)(-)π(+) to B(0)→D(-)K(+) and B(0)→D(-)π(+), leading to f(s)/f(d) = 0.253 ± 0.017 ± 0.017 ± 0.020, where the uncertainties are statistical, systematic, and theoretical, respectively.
在 LHC 的 7 TeV pp 碰撞中,通过对应于 35 pb(-1)积分亮度的数据,确定了三种衰变模式 B(0)→D(-)K(+)、B(0)→D(-)π(+) 和 B(s)(0)→D(s)(-)π(+) 的相对丰度。发现 B(0)→D(-)K(+) 的分支比为 B(B(0)→D(-)K(+)) = (2.01 ± 0.18(stat) ± 0.14(syst)) × 10(-4)。通过 B(s)(0)→D(s)(-)π(+)相对于 B(0)→D(-)K(+)和 B(0)→D(-)π(+)的相对丰度来确定碎裂分数 f(s)/f(d),得到 f(s)/f(d) = 0.253 ± 0.017 ± 0.017 ± 0.020,其中不确定性分别是统计的、系统的和理论的。