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We discuss within the framework of effective four-fermion scalar interactionthe phenomenology of a Weakly Interacting Massive Particle (WIMP) Dirac DarkMatter candidate which is exothermic (i.e. is metastable and interacts withnuclear targets down-scattering to a lower-mass state) and $Ge$-phobic (i.e.whose couplings to quarks violate isospin symmetry leading to a suppression ofits cross section off Germanium targets). We discuss the specific example ofthe CDMS-II Silicon three-candidate effect showing that a region of theparameter space of the model exists where WIMP scatterings can explain theexcess in compliance with other experimental constraints, while at the sametime the Dark Matter particle can have a thermal relic density compatible withobservation. In this scenario the metastable state $\chi$ and the lowest-massone $\chi^{\prime}$ have approximately the same density in the present Universeand in our Galaxy, but direct detection experiments are only sensitive to thedown-scatters of $\chi$ to $\chi^{\prime}$. We include a discussion of therecently calculated Next-to-Leading Order corrections to Dark Matter-nucleusscattering, showing that their impact on the phenomenology is typically small,but can become sizable in the same parameter space where the thermal relicdensity is compatible to observation.

Effective scalar four-fermion interaction for Ge-phobic exothermic dark matter and the CDMS-II Silicon excess