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Heavy fields of Hubble scale order present during inflation contribute to thenon-Gaussian signature for the three-point function of the inflaton. Takinginto account that Hubble scale is around the scale of grand unified theory(GUT), this opens a possibility that the GUT scale signatures, which are veryhard to be discovered at collider, might be detectable by using informationfrom the precise observations of cosmic microwave background. We discuss adetactability of the $X, Y$ gauge boson present in any GUT in a framework ofcosmological collider physics. Calculating one-loop contributions of $X, Y$gauge bosons to the inflaton three-point functions, we find a remarkable resultthat one-loop diagram with interactions originated from the mass terms of $X,Y$ gauge bosons provides an enhancement factor expressed by the ratio betweenthe $X, Y$ gauge boson mass and Hubble scale as $(m_X/H)^4$. In an estimationof the non-Gaussianity, this factor is crucial and its impact on thedetactability of $X, Y$ gauge bosons is discussed.

Non-Gaussianity from $X, Y$ gauge bosons in Cosmological Collider Physics