Abstract
New physics can be light if it is hidden, coupling very weakly to the Standard Model. In this work we investigate the discovery prospects of Abelian hidden sectors in lower-energy fixed-target and high-precision experiments. We focus on a minimal supersymmetric realization consisting of an Abelian vector multiplet, coupled to hypercharge by kinetic mixing, and a pair of chiral Higgs multiplets. This simple theory can give rise to a broad range of experimental signals, including both commonly-studied patterns of hidden vector decay as well as new and distinctive hidden sector cascades. We find limits from the production of hidden states other than the vector itself. In particular, we show that if the hidden Abelian symmetry is higgsed, and the corresponding hidden Higgs boson has visible decays, it severely restricts the ability of the hidden sector to explain the anomalous muon magnetic moment.
Highlights
New physics beyond the Standard Model (SM) could take many forms
We focus on a minimal supersymmetric realization consisting of an Abelian vector multiplet, coupled to hypercharge by kinetic mixing, and a pair of chiral Higgs multiplets
Along with MINOS, we consider the possibility of both hidden sector decay and scattering, as shown in tables 5 and 6, though we find that the limits from visible decays are only as good as those from CHARM
Summary
New physics beyond the Standard Model (SM) could take many forms. To be consistent with existing experiments, any new particles must either be heavier than the electroweak scale or they must interact very weakly with us [1]. The two scenarios that have received the most attention are minimal models where the new massive vector Zx decays primarily to the SM [16,17,18,19] or to a pair of dark matter particles [20,21,22,23,24]. These decay channels can occur in the non-minimal theory we study here, but other decay channels can be dominant as well. Some technical details about the theory and our calculation of vector production and detection in fixed target experiments are collected in the appendices A, B and C
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