EFT analysis of New Physics at COHERENT

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.

52 pages, 7 figures, 3 tables, typos corrected

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• Particle Physics at the European Spallation Source
• A global analysis of axion-like particle interactions using SMEFT fits
• DUNE potential as a New Physics probe
• COHERENT production of a dark fermion
• A neutrino window to scalar leptoquarks: from low energy to colliders
• Neutrino nucleus Quasi-Elastic and resonant Neutral Current scatterings with Non-Standard Interactions
• Muon-Decay Parameters from COHERENT
• Alleviating the present tension between T2K and NO$\nu$A with nonstandard neutrino interactions
• Measuring the Low-Energy Weak Mixing Angle with Supernova Neutrinos
• Oscillation-Independent Probes of Neutrino Non-Standard Interactions from Supernovae
• Neutrino nonstandard interactions: Confronting COHERENT and LHC data