Extensive searches to probe the particle nature of dark matter (DM) have been going on for some decades now but, so far, no conclusive evidence has been found. Among various options, the Weakly Interacting Massive Particles (WIMP) remains one of the prime possibilities as candidates for DM near the TeV scale. Taking a phenomenological view, such null results may be explained for a generic WIMP in a Higgs-portal scenario if we allow the light-quark Yukawa couplings to assume non-Standard Model (non-SM)-like values. This follows from a cancellation among different terms in the DM-nucleon scattering which can, in turn, lead to a vanishingly small direct-detection cross section. It might also lead to isospin violation in the DM-nucleon scattering. Such non-SM values of light-quark Yukawa couplings may be probed in the high luminosity run of the LHC.

探查暗物质（DM）的粒子性质的广泛搜索已经进行了数十年，但到目前为止，尚未找到确凿的证据。在各种选择中，弱相互作用的质点粒子（WIMP）仍然是接近TeV尺度的DM候选者的主要可能性之一。从现象学的观点来看，如果我们允许轻夸克汤河耦合假定非标准模型（non-SM）样的值，那么对于希格斯门户情景中的通用WIMP，可以解释这种无效结果。这是由于在DM核子散射中不同项之间的抵消而导致的，而这又会导致直接检测的横截面逐渐消失。它也可能导致DM核子散射中的同位旋违规。轻夸克Yukawa联轴器的这种非SM值可以在LHC的高光度运行中探查。