Conserved Currents are Not Anomaly-Safe
arxiv(2024)
摘要
New vector bosons that are coupled to conserved currents in the Standard
Model exhibit enhanced rates below the electroweak scale from anomalous
triangle amplitudes, leading to (energy/vector mass)^2 enhancements to rare Z
decays and flavor-changing meson decays into the longitudinally polarized
vector boson. In the case of a vector boson gauging U(1)_B-L, the mass gap
between the top quark and the remaining SM fermions leads to (energy/vector
mass)^2 enhancements for processes with momentum transfer below the top mass.
In addition, we examine the case of an intergenerational U(1)_B_3 - L_2
that has been proposed to resolve the (g-2)_μ anomaly with an MeV scale DM
candidate, and we find that these enhanced processes constrain the entire
parameter space.
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