Neutrino non-standard interactions meet precision measurements of $N_{\rm eff}$
Yong Du,Jinhong Yu +1 more
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In this paper, the number of relativistic species in the early universe has been precisely calculated in the standard model, and would be measured to the percent level by CMB-S4 in future.Abstract:
The number of relativistic species, $N_{\rm eff}$, has been precisely calculated in the standard model, and would be measured to the percent level by CMB-S4 in future. Neutral-current non-standard interactions would affect neutrino decoupling in the early Universe, thus modifying $N_{\rm eff}$. We parameterize those operators up to dimension-7 in the effective field theory framework, and then provide a complete, generic and analytical dictionary for the collision term integrals. From precision measurements of $N_{\rm eff}$, the most stringent constraint is obtained for the dimension-6 vector-type neutrino-electron operator, whose scale is constrained to be above about 195 (331) GeV from Planck (CMB-S4). We find our results complementary to other experiments like neutrino coherent scattering, neutrino oscillation, collider, and neutrino deep inelastic scattering experiments.read more
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The Forward Physics Facility at the High-Luminosity LHC
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