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Improving the Global SMEFT Picture with Bounds on Neutrino NSI
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abstract
We analyze how neutrino oscillation and coherent elastic neutrino-nucleus scattering data impact the global SMEFT fit. We first review the mapping between the SMEFT parameters and the so-called NSI framework, commonly considered in the neutrino literature. We also present a detailed discussion of how the measurements for the normalization of neutrino fluxes and cross sections, that will also be affected by the new physics, indirectly impact the measured oscillation probabilities. We then analyze two well-motivated simplified scenarios. Firstly, we study a lepton flavour conserving case, usually assumed in global SMEFT analyses, showing the complementarity of neutrino oscillation and CE$\nu$NS experiments with other low-energy observables. We find that the inclusion of neutrino data allows to constrain previously unbounded SMEFT operators involving the tau flavour and confirm the improvement of the constraint on a combination of Wilson coefficients previously identified. Moreover, we find that neutrino oscillation constraints on NSI are improved when embedded in the global SMEFT framework. Secondly, we study a lepton flavour violating scenario and find that neutrino data also improves over previously derived global constraints thanks to its sensitivity to new combinations of Wilson coefficients.
Forward citations
Cited by 5 Pith papers
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The fermion sector of the SMEFT from asymptotically safe gravity
In a toy model of one quark generation, asymptotically safe gravity predicts four-fermion SMEFT coefficients are either Planck-scale suppressed or zero, with exceptions only at very large gravitational coupling.
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Enhanced active-sterile neutrino polarizability at the intensity frontier
A new neutrino-photon interaction involving a sterile neutrino is constrained at NOMAD and MiniBooNE, and a light-mediator realization can fit the MiniBooNE excess.
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First bounds on effective muon interactions using the NA64$\mu$ experiment at CERN
NA64mu data yield first 90% CL bounds on two SMEFT and three nuSMEFT four-lepton operators involving muons, with future projections to Lambda ~ 100 GeV.
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From DUNE Sensitivities to UV Models: Implications of Flavour Constraints
Simple weakly-coupled BSM models cannot produce a DUNE-visible e-tau semileptonic NSI: flavour constraints cap C_lq,1311 at about 1e-2 TeV^-2, nearly an order below DUNE's reach.
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Testing light and heavy vector mediators with solar CE$\nu$NS measurements
Combined solar CEνNS data from XENONnT, PandaX-4T, and LZ yield competitive constraints on vector NSI and light mediators and a weak mixing angle measurement at low momentum transfer.
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