Constraints on the X17 boson from IceCube searches for non-standard interactions of neutrinos
arxiv(2024)
摘要
We explain the ATOMKI anomaly with a very light Z' state that features
non-anomalous and non-flavour-universal vector and axial-vector couplings to
all leptons. This Z' comes from a theoretical framework with a spontaneously
broken U(1)' symmetry in addition to the Standard Model (SM) gauge group and
is compliant with current measurements of the anomalous magnetic moments of the
electron and the muon as well as beam dump experiments. The lepton flavour
structure of this model allows for Z' couplings to all light neutrinos,
suggesting the possibility of Z'-mediated Non-Standard Interactions (NSIs) of
neutrinos in matter, so that measurements of the strength parameters of the
NSIs can constrain the value of the couplings. We use experimental constraints
on NSIs of neutrinos using older TEXONO data and newer IceCube data. The
IceCube data, in particular, strongly constrain the flavour universality of the
leptonic vector current. The constraints enable us to define the region of
parameter space of this theoretical scenario that can be pursued in further
phenomenological analyses.
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