论文标题
在巴巴尔搜索黑暗的嗜血量标量
Search for a Dark Leptophilic Scalar at BABAR
论文作者
论文摘要
超出标准模型以外的物理学的许多方案都预测了新量规单线的存在，这可能比弱尺度更轻。如果MEV到GEV范围内具有质量的其他标量的实验限制，如果它们主要与瘦素相互作用而不是夸克，则可以显着削弱。在$ e^+e^ - $ collider上，这样的瘦素标量（$ ϕ_l $）将主要通过$τ$ Lepton的辐射产生。我们在此报告$ e^+e^ - \ toτ^+τ^ - ϕ_l $，$ ϕ_l \ to \ ell^+\ ell^ - $（$ \ ell = e，μ$）使用Babar实验在Slac上收集的数据。未观察到明显的信号，我们将$ ϕ_l $耦合的限制设置为在0.04 <m $ _ {ϕ_l} $ <7.0 GEV范围内的leptons上。这些边界在当前的约束上显着改善，几乎完全不包括在90 \％置信度下，在4 GEV以下的MUON异常磁矩中观察到的差异所青睐的参数空间。
Many scenarios of physics beyond the Standard Model predict the existence of new gauge singlets, which might be substantially lighter than the weak scale. The experimental constraints on additional scalars with masses in the MeV to GeV range could be significantly weakened if they interact predominantly with leptons rather than quarks. At an $e^+e^-$ collider, such a leptophilic scalar ($ϕ_L$) would be produced predominantly through radiation from a $τ$ lepton. We report herein a search for $e^+e^- \to τ^+τ^- ϕ_L$, $ϕ_L \to \ell^+\ell^-$ ($\ell=e,μ$) using data collected by the BABAR experiment at SLAC. No significant signal is observed, and we set limits on the $ϕ_L$ coupling to leptons in the range 0.04 < m$_{ϕ_L}$ < 7.0 GeV. These bounds significantly improve upon the current constraints, excluding almost entirely the parameter space favored by the observed discrepancy in the muon anomalous magnetic moment below 4 GeV at 90\% confidence level.
