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Since 7Li is easily destroyed in low temperatures, the surface lithiumabundance decreases as stars evolve. This is supported by the lithium depletionobserved in the atmosphere of most red giants. However, recent studies showthat almost all of red clump stars have high lithium abundances A(Li)>-0.9,which are not predicted by the standard theory of the low-mass stellarevolution. In order to reconcile the discrepancy between the observations andthe model, we consider additional energy loss channels which may come fromphysics beyond the Standard Model. A(Li) slightly increases near the tip of thered giant branch even in the standard model with thermohaline mixing because ofthe 7Be production by the Cameron-Fowler mechanism, but the resultant 7Liabundance is much lower than the observed values. We find that the productionof 7Be becomes more active if there are additional energy loss channels,because themohaline mixing becomes more efficient and a heavier helium core isformed.

Enhancement of Lithium in Red Clump Stars by the Additional Energy Loss Induced by New Physics