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Pion decay constraints on exotic 17 MeV vector bosons
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abstract
We derive constraints on the couplings of light vector particles to all first-generation Standard Model fermions using leptonic decays of the charged pion, $\pi^+\to e^+ \nu_e X_\mu$. In models where the net charge to which $X_\mu$ couples is not conserved, no lepton helicity flip is required for the decay to happen, enhancing the decay rate by factors of ${O}(m_\pi^4/m_e^2m_X^2)$. A past search at the SINDRUM-I spectrometer severely constrains this possibility. In the context of the hypothesized $17$ MeV particle proposed to explain anomalous $^8$Be, $^4$He, and $^{12}$C nuclear transitions claimed by the ATOMKI experiment, this limit rules out vector-boson explanations and poses strong limits on axial-vector ones.
Forward citations
Cited by 5 Pith papers
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Updated E141 constraints on a long-lived $X_{17}$ vector boson
A refined simulation of SLAC E141 shows the experiment's old exclusion region does not cover the 16.9 MeV X17, leaving a window at ε_e between 6.5e-5 and 1.1e-4.
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Flavor specific chiral $U(1)_X$ framework for explaining the ATOMKI anomaly
A gauged, flavor-specific U(1)_X two-Higgs-doublet model can realize the axial-vector Z' couplings needed to explain the ATOMKI 8Be and 4He anomalies while evading current bounds.
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The X17 with Chiral Couplings
A spin-1 X17 with chiral couplings fits the ATOMKI nuclear anomalies at 99% CL only in a parameter region that atomic parity violation and KLOE-2/NA64 exclude, driven mainly by the 12C(17.23) transition.
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Flavor specific chiral $U(1)_X$ framework for explaining the ATOMKI anomaly
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