论文标题
搜索稀有衰减$ w^+ \ to d^+ _sγ$和$ z \ to d^0γ$ at LHCB
Search for the rare decays $W^+ \to D^+_sγ$ and $Z \to D^0γ$ at LHCb
论文作者
论文摘要
搜索稀有衰败$ w^{+} \ rightarrow {d^{+} _ {s}γ} $和$ z \ rightarrow {d^{0}γ} $是使用proton-proton碰撞数据通过LHCB在13 tev的Centre umass Energitions中收集的Proton-Proton碰撞数据来执行的。 fb $^{ - 1} $。使用$ W^{+} \ rightarrow {μ^{+}ν} $和$ z \ rightArrow {μ^{+}μ^{+}μ^{ - }} $衰减为标准化频道。上限为$ 6.5 \ times10^{ - 4} $和$ 2.1 \ times10^{ - 3} $在95％的置信度下，对于$ w^{+} \ rightarrow {d^{+} _ {+} _ {s} _ {s} _ {s}γ} $和$ z \ z \ rightarrow {d^d^d^0} $} $ noces，这是首次报道的搜索$ z \ rightarrow {d^{0}γ} $衰减，而$ W^{+} \ rightArrow {d^{+} _ {s} _ {s}γ} $分支分数在先前的最佳限制下改善分支的上限。
A search for the rare decays $W^{+}\rightarrow{D^{+}_{s}γ}$ and $Z\rightarrow{D^{0}γ}$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 2.0 fb$^{-1}$. No significant signal is observed for either decay mode and upper limits on their branching fractions are set using $W^{+}\rightarrow{μ^{+}ν}$ and $Z\rightarrow{μ^{+}μ^{-}}$ decays as normalization channels. The upper limits are $6.5\times10^{-4}$ and $2.1\times10^{-3}$ at 95% confidence level for the $W^{+}\rightarrow{D^{+}_{s}γ}$ and $Z\rightarrow{D^{0}γ}$ decay modes, respectively. This is the first reported search for the $Z\rightarrow{D^{0}γ}$ decay, while the upper limit on the $W^{+}\rightarrow{D^{+}_{s}γ}$ branching fraction improves upon the previous best limit.
