Golden Probe of the Top Yukuwa

Abstract

We perform a preliminary study of the ability of the Higgs decay to four leptons to shed light on the top quark Yukawa couplings. In particular we examine whether the h → 4ℓ 'golden channel' is sensitive to the CP properties of the top quark couplings to the Higgs boson. We show that kinematic distributions are sensitive to interference of the next-to-leading order electroweak corrections with the tree level ZZ contribution. This translates into a sensitivity to the top quark Yukawa couplings such that meaningful constraints on their CP properties can begin to be obtained once ~ 300 fb^(-1) of data has been collected at ~ 14 TeV, with significant improvements at higher luminosity or with a higher energy hadron collider. This makes the h → 4ℓ channel a useful probe of the top quark Yukawa couplings that is qualitatively different from already established searches in h → Vy two body decays, tth, and gg→h. We also briefly discuss other potential possibilities for probing the top Yukawa CP properties in h→2ℓγ and ℓ+ℓ−→hZ,hγ.

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