CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma, USA.
Phys Rev Lett. 2015 Dec 31;115(26):262001. doi: 10.1103/PhysRevLett.115.262001. Epub 2015 Dec 30.
With an integrated luminosity of 2.47 fb(-1) recorded by the ATLAS experiment at the LHC, the exclusive decays B(s)(0)→J/ψϕ and B(d)(0)→J/ψK(*0) of B mesons produced in pp collisions at √s=7 TeV are used to determine the ratio of fragmentation fractions f(s)/f(d). From the observed B(s)(0)→J/ψϕ and B(d)(0)→J/ψK(*0) yields, the quantity (f(s)/f(d))[B(B(s)(0)→J/ψϕ)/B(B(d)(0)→J/ψK(*0))] is measured to be 0.199±0.004(stat)±0.008(syst). Using a recent theory prediction for [B(B(s)(0)→J/ψϕ)/B(B(d)(0)→J/ψK(*0))] yields (f(s)/f(d))=0.240±0.004(stat)±0.010(syst)±0.017(th). This result is based on a new approach that provides a significant improvement of the world average.
利用 ATLAS 实验在 LHC 上记录的总积分亮度为 2.47 fb(-1),对质心能量为 7 TeV 的 pp 碰撞中产生的 B 介子的两个事例 B(s)(0)→J/ψϕ 和 B(d)(0)→J/ψK(*0)的末态衰变进行了研究,用以确定碎裂函数比 f(s)/f(d)。通过对观测到的 B(s)(0)→J/ψϕ 和 B(d)(0)→J/ψK(*0)事例的分析,测量得到碎裂函数比(f(s)/f(d))[B(B(s)(0)→J/ψϕ)/B(B(d)(0)→J/ψK(*0))]为 0.199±0.004(stat)±0.008(syst)。利用近期对 [B(B(s)(0)→J/ψϕ)/B(B(d)(0)→J/ψK(*0))]的理论预言,得到(f(s)/f(d))=0.240±0.004(stat)±0.010(syst)±0.017(th)。该结果基于一种新的方法,其对世界平均值的改进具有重要意义。