论文标题
搜索$ d^0 $ mesons的罕见衰减成两个muons
Search for rare decays of $D^0$ mesons into two muons
论文作者
论文摘要
搜索非常罕见的$ d^0 \至μ^+μ^ - $衰减是使用LHCB实验收集的质子 - 普罗顿碰撞中的数据进行的，$ \ sqrt {s} = 7 $，8 $，8和$ 13〜 \ \ rm {tev} $，对应于$ 9〜 \ rm rmmm的集成液体，该搜索是从$ d^{\ ast+} \ to d^0π^+$衰减的$ d^0 $介子优化的，但对$ d^0 $ mesons也很敏感。没有观察到超过预期背景的事件的证据。该衰减的分支分数的上限设置为$ \ mathcal {b}（d^0 \toμ^+μ^ - ）<3.1 \ times 10^{ - 9} $，$ 90 \％$ cl。这代表了世界上最严格的限制，限制了标准模型之外的物理模型。
A search for the very rare $D^0 \to μ^+μ^-$ decay is performed using data collected by the LHCb experiment in proton-proton collisions at $\sqrt{s} = 7$, 8 and $13~\rm{TeV}$, corresponding to an integrated luminosity of $9~\rm{fb^{-1}}$. The search is optimised for $D^0$ mesons from $D^{\ast+}\to D^0π^+$ decays but is also sensitive to $D^0$ mesons from other sources. No evidence for an excess of events over the expected background is observed. An upper limit on the branching fraction of this decay is set at $\mathcal{B}(D^0 \to μ^+μ^-) < 3.1 \times 10^{-9}$ at a $90\%$ CL. This represents the world's most stringent limit, constraining models of physics beyond the Standard Model.
