The $ν_{R}$-philic scalar: its loop-induced interactions and Yukawa forces in LIGO observations
英文摘要：
Right-handed neutrinos ($ν_{R}$) are often considered as a portal to new hidden physics. It is tempting to consider a gauge singlet scalar $(ϕ)$ that exclusively couples to $ν_{R}$ via a $ν_{R}ν_{R}ϕ$ term. Such a $ν_{R}$-philic scalar does not interact with charged fermions at tree level but loop-induced effective interactions are inevitable, which are systematically investigated in this work. The magnitude of the loop-induced couplings coincidentally meets the current sensitivity of fifth-force searches. In particular, the loop-induced coupling to muons could be tested in the recent LIGO observations of neutron star mergers as there might be a sizable Yukawa force in the binary system mediated by the $ν_{R}$-philic scalar.
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