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EFT analysis of New Physics at COHERENT
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abstract
Using an effective field theory approach, we study coherent neutrino scattering on nuclei, in the setup pertinent to the COHERENT experiment. We include non-standard effects both in neutrino production and detection, with an arbitrary flavor structure, with all leading Wilson coefficients simultaneously present, and without assuming factorization in flux times cross section. A concise description of the COHERENT event rate is obtained by introducing three generalized weak charges, which can be associated (in a certain sense) to the production and scattering of $\nu_e$, $\nu_\mu$ and $\bar{\nu}_\mu$ on the nuclear target. Our results are presented in a convenient form that can be trivially applied to specific New Physics scenarios. In particular, we find that existing COHERENT measurements provide percent level constraints on two combinations of Wilson coefficients. These constraints have a visible impact on the global SMEFT fit, even in the constrained flavor-blind setup. The improvement, which affects certain 4-fermion LLQQ operators, is significantly more important in a flavor-general SMEFT. Our work shows that COHERENT data should be included in electroweak precision studies from now on.
Forward citations
Cited by 7 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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The paper constructs complete and minimal relativistic operator bases for nucleon-nucleon, pion-nucleon-nucleon, and three-nucleon sectors up to p6, and a spurion-based leptonic sector up to p4, using Hilbert series a...
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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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Leptonic Flavor from Modular $A_4$: UV Mediators and SMEFT Realizations
This paper classifies lepton-coupled UV mediators under modular A4 symmetry and derives experimental lower bounds on their masses from lepton flavor observables.
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EFT analysis of New Physics at COHERENT with Dirac neutrinos
COHERENT data can constrain flavor-general new physics in both neutrino production and detection once right-handed Dirac neutrinos are included, and the full rate reduces to a compact set of effective nuclear charges.
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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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