Abstract
The Standard Model Effective Field Theory (SMEFT) provides a systematic and model-independent framework to study neutrino non-standard interactions (NSIs). We study the constraining power of the on-going neutrino oscillation experiments T2K, NOνA, Daya Bay, Double Chooz and RENO in the SMEFT framework. A full consideration of matching is provided between different effective field theories and the renormalization group running at different scales, filling the gap between the low-energy neutrino oscillation experiments and SMEFT at the UV scale. We first illustrate our method with a top- down approach in a simplified scalar leptoquark model, showing more stringent constraints from the neutrino oscillation experiments compared to collider studies. We then provide a bottom-up study on individual dimension-6 SMEFT operators and find NSIs in neutrino experiments already sensitive to new physics at ∼20 TeV when the Wilson coefficients are fixed at unity. We also investigate the correlation among multiple operators at the UV scale and find it could change the constraints on SMEFT operators by several orders of magnitude compared with when only one operator is considered. Furthermore, we find that accelerator and reactor neutrino experiments are sensitive to different SMEFT operators, which highlights the complementarity of the two experiment types.
Highlights
A full consideration of matching is provided between different effective field theories and the renormalization group running at different scales, filling the gap between the low-energy neutrino oscillation experiments and Standard Model Effective Field Theory (SMEFT) at the UV scale
We provide a bottom-up study on individual dimension-6 SMEFT operators and find non-standard interactions (NSIs) in neutrino experiments already sensitive to new physics at ∼20 TeV when the Wilson coefficients are fixed at unity
To see the quantitative impact of extra operators on the upper bound of the Wilson coefficient, we can, for example, compare the difference between the upper bound for Cledq when only one dimension-6 SMEFT operator is considered at the input scale and that when multiple operators exist at the UV scale
Summary
[20] that matching the differential rate Rαβ, defined as the number of oscillation events observed per second per neutrino energy [20, 44], in both formalisms to obtain the connection between the NSI parameters and the Wilson coefficients in LEFT is highly non-trivial. This matching procedure is not guaranteed to give a meaningful match of the two sets of parameters unless one works in the linear approximation in terms of s,d. We count on the Wilson package [32] to take care of these effects
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
