论文标题
稀有魅力$ \ boldsymbol {c \ to u \，ν\barν} $ dineutrino null null测试$ \ boldsymbol {e^+e^ - } $ - 机器
Rare charm $\boldsymbol{c\to u\,ν\barν}$ dineutrino null tests for $\boldsymbol{e^+e^-}$-machines
论文作者
论文摘要
稀有$ |ΔC| = |ΔU| = 1 $转变为dineutrinos被强烈抑制，并构成了标准模型的出色无效测试。 While branching ratios of $D \to P \,ν\bar ν$, $D \to P^+ P^- \, ν\bar ν$, $P=π, K$, baryonic $Λ_c^+ \to p \,ν\bar ν$, and $Ξ_c^+ \to Σ^+ \, ν\bar ν$ and inclusive $D \to X ν\ barν$衰减是实验中不受限制的，新物理的信号可以在拐角处。在最一般的Lepton风味结构的情况下，我们提供了与模型无关的分支比例，即$ \ times 10^{ - 5} $，$ \ sim 10^{ - 5} $对于带电的Lepton保存和少量$ \ $ \ $ \ $ \ times 10^{ - 6} $，假设Lepton Lessive late lepton conceptionally。我们还以$ z^\ Prime $和Leptoquark型号给出了上限。光右中微子的存在可能会影响这些限制，这可能会在TEV处发生Lepton数字违规，并且可以在$ \ Mathcal {B}上进行改进的限制（d^0 \ to \ to \ to \ to \ tot \ text {Invisibles}）$在$ \ sim 10^{10^{ - 6} $上的级别上的级别上的级别上的一点点优于$ \ sim \ sim 10^{ - 6} $，大约是两点左右。 $ c \ touν\barν$模式的签名包含缺失的能量，适用于$ e^+ e^ - $ - 设施的实验搜索，例如BES III，Belle II和未来的$ E^+ E^+ E^ - $ - colliders，例如在$ z $上运行的FCC-EE。
Rare $|Δc|=|Δu|=1$ transitions into dineutrinos are strongly GIM-suppressed and constitute excellent null tests of the standard model. While branching ratios of $D \to P \,ν\bar ν$, $D \to P^+ P^- \, ν\bar ν$, $P=π, K$, baryonic $Λ_c^+ \to p \,ν\bar ν$, and $Ξ_c^+ \to Σ^+ \, ν\bar ν$ and inclusive $D \to X ν\bar ν$ decays are experimentally unconstrained, signals of new physics can be just around the corner. We provide model-independent upper limits on branching ratios reaching few $\times 10^{-5}$ in the most general case of arbitrary lepton flavor structure, $\sim 10^{-5}$ for scenarios with charged lepton conservation and few $\times 10^{-6}$ assuming lepton universality. We also give upper limits in $Z^\prime$ and leptoquark models. The presence of light right-handed neutrinos can affect these limits, a possibility that can occur for lepton number violation at a TeV, and that can be excluded with an improved bound on $\mathcal{B}(D^0 \to \text{invisibles})$ at the level of $\sim 10^{-6}$, about two orders of magnitude better than the present one. Signatures of $c \to u ν\bar ν$ modes contain missing energy and are suited for experimental searches at $e^+ e^-$-facilities, such as BES III, Belle II and future $e^+ e^-$-colliders, such as the FCC-ee running at the $Z$.
