Yerevan Physics Institute, Yerevan, Armenia.
Phys Rev Lett. 2011 Nov 4;107(19):191802. doi: 10.1103/PhysRevLett.107.191802. Epub 2011 Nov 1.
A search for the rare decays B(s)(0) → μ+ μ- and B(0) → μ+ μ- is performed in pp collisions at sqrt[s] = 7 TeV, with a data sample corresponding to an integrated luminosity of 1.14 fb(-1), collected by the CMS experiment at the LHC. In both cases, the number of events observed after all selection requirements is consistent with expectations from background and standard-model signal predictions. The resulting upper limits on the branching fractions are B(B(s)(0) → μ+ μ-) < 1.9 × 10(-8) and B(B(0) → μ+ μ-)<4.6 × 10(-9), at 95% confidence level.
搜索罕见的衰变 B(s)(0) → μ+ μ- 和 B(0) → μ+ μ- 在 pp 碰撞中发生在 sqrt[s] = 7 TeV，使用 CMS 实验在 LHC 中收集的对应于 1.14 fb(-1) 的积分亮度的数据集。在这两种情况下，在所有选择要求之后观察到的事件数量与背景和标准模型信号预测的预期一致。在 95%置信水平下，得到的分支比上限为 B(B(s)(0) → μ+ μ-) < 1.9 × 10(-8) 和 B(B(0) → μ+ μ-)<4.6 × 10(-9)。
