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Wright S, Wu S, Wyllie K, Xie Y, Xing Z, Xu Z, Yang Z, Yuan X, Yushchenko O, Zangoli M, Zavertyaev M, Zhang L, Zhang W C, Zhang Y, Zhelezov A, Zhokhov A, Zhong L, Zvyagin A
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2014 Oct 10;113(15):151601. doi: 10.1103/PhysRevLett.113.151601. Epub 2014 Oct 6.
A measurement of the ratio of the branching fractions of the B(+) → K(+)μ(+)μ(-) and B(+) → K(+)e(+)e(-) decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1 < q(2) < 6 GeV(2)/c(4) is measured to be 0.745(-0.074)(+0.090)(stat) ± 0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.
利用质子 - 质子碰撞数据给出了B(+) → K(+)μ(+)μ(-)和B(+) → K(+)e(+)e(-)衰变分支比的比值测量结果，该数据对应于质心能量为7和8 TeV时LHCb实验记录的3.0 fb(-1)的积分亮度。对于双轻子不变质量平方范围1 < q(2) < 6 GeV(2)/c(4)，测量得到的分支比比值为0.745(-0.074)(+0.090)(统计) ± 0.036(系统)。该值是迄今为止对分支比比值最精确的测量，并且在2.6个标准差内与标准模型预测相符。
