摘要: We construct explicit string theory models realizing the recently proposed "St\"uckelberg Portal" scenario, a framework for building Z' mediation without need to introduce unwanted exotic matter charged under Standard Model. This scenario can be viewed purely field-theoretically, although it is particularly well motivated from theory. By analyzing carefully St\"uckelberg couplings between Abelian gauge bosons and RR axions, we first global intersecting brane which extend Model with genuine hidden sector, nonetheless connected via U(1) mass mixings. Utilizing construct, discuss some broad phenomenological properties experimental implications of this such as Z-Z' mixings, dark stability relic density, supersymmetry mediation. With an appropriate confining our setup also provides minimal realization valley scenario. further explore possibility obtaining small masses large ensemble bosons. Related portal are two mechanisms that connect visible sectors, namely by non-perturbative operators photon on briefly comment.
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