Abstract
Novel leptophilic neutral currents can be tested at upcoming neutrino oscillation experiments using two complementary processes, neutrino trident production and neutrino-electron ($\nu-e$) elastic scattering. Considering generic anomaly-free $U(1)$ extensions of the Standard Model, we discuss the characteristics of $\nu-e$ scattering as well as $e^+e^-$ and $\mu^+\mu^-$ trident production at the DUNE near detector in the presence of such BSM scenarios. We then determine the sensitivity of DUNE in constraining the well-known $L_e - L_\mu$ and $L_\mu - L_\tau$ models. We conclude that DUNE will be able to probe these leptophilic models with unprecedented sensitivity, covering unproved explanations of the $(g-2)_\mu$ discrepancy.
Highlights
The discovery of neutrino oscillation is the first laboratory-based proof of physics beyond the Standard Model (BSM) establishing that, in contrast to the predictions of the Standard Model (SM), the neutrino sector has at least three mass eigenstates distinct from the flavor states defined by the charged leptons
We study potential constraints that can be placed on a general set of leptophilic Z0 models in the two most likely scattering channels for this type of BSM at the near detector of Deep Underground Neutrino Experiment (DUNE): ν − e scattering and νll trident scattering
The generation neutrino oscillation experiments are primarily designed for making precision measurements of the neutrino mixing parameters, the unprecedented fluxes and large detectors will allow for many nonminimal new physics searches
Summary
The discovery of neutrino oscillation is the first laboratory-based proof of physics beyond the Standard Model (BSM) establishing that, in contrast to the predictions of the Standard Model (SM), the neutrino sector has at least three mass eigenstates distinct from the flavor states defined by the charged leptons. The main advantage in such measurements lies on the flavor structure of dimuon tridents, which can be used to constrain otherwise difficult to test models, such as the one where a new force is associated with the Lμ − Lτ gauge symmetry [52] These processes can place stringent bounds on many classes of mediators, many scenarios are already heavily constrained through other experimental work. [55] the equivalent photon approximation (EPA) discussed in several recent studies [57,58] for the calculation of the trident cross section leads to intolerably large errors in the predictions for the νll scattering channels in the SM For this reason, we calculate this process without making this approximation.
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