论文标题
充电Wino衰减率的精确估计
Precise Estimate of Charged Wino Decay Rate
论文作者
论文摘要
Wino是$ \ Mathrm {su}（2）_ {l} $ Triplet Majoraana fermion和一个动机的暗物质候选者。由于$ \ mathrm {su}（2）_ {l} $ symmetry，带电和中性的Winos之间的质量差异很小。微小的质量差异使带电的Wino Meta稳定稳定，该稳定器在对撞机实验中提供了消失的带电轨道签名。 LHC上Wino暗物质的限制在很大程度上取决于Wino的寿命。我们计算了带电的Wino衰减的临近领先顺序（NLO）校正，并对衰减率进行最精确的估计。我们发现NLO衰减率取决于质量差异，几乎不取决于Wino质量本身在沉重的Wino限制中。结果，我们发现NLO校正对增长2-4％的寿命产生了较小的影响。
The Wino is an $\mathrm{SU}(2)_{L}$ triplet Majorana fermion and a well-motivated dark matter candidate. The mass difference between the charged and the neutral Winos is small thanks to the $\mathrm{SU}(2)_{L}$ symmetry. The small mass difference makes the charged Wino meta-stable, which provides disappearing charged track signatures at collider experiments. The constraint on the Wino dark matter at the LHC strongly depends on the Wino lifetime. We compute the next-to-leading order (NLO) correction of the charged Wino decay and make the most precise estimate of the decay rate. We find that the NLO decay rate is determined by the mass difference and scarcely depend on the Wino mass itself in the heavy Wino limit. As a result, we find the NLO correction gives a minor impact on the lifetime of 2-4% increase.
