Abstract
We investigate the possibility of using neutrino trident production to probe leptophilic charged scalars at future high intensity neutrino experiments. We show that under specific assumptions, this production process can provide competitive sensitivity for generic charged scalars as compared to common existing bounds. We also investigate how the recently proposed mixed-flavour production - where the two oppositely charged leptons in the final state need not be muon flavoured - can give a 20-50% increase in sensitivity for certain configurations of new physics couplings as compared to traditional trident modes. We then categorize all renormalizable leptophilic scalar extensions based on their representation under $SU(2)\times U(1)$, and discuss the Higgs triplet and Zee-Babu models as explicit UV realizations. We find that the inclusion of additional doubly charged scalars and the need to reproduce neutrino masses make trident production uncompetitive with current bounds for these specific UV completions. Our work represents the first application of neutrino trident production to study charged scalars, and of mixed-flavour final states to study physics beyond the Standard Model.
Highlights
AND MOTIVATIONNeutrino oscillation experiments provide conclusive evidence that the standard model (SM) is incomplete
We have investigated Neutrino trident production (NTP) as a tool for studying scalar extensions of the SM
We have considered SU(2) singlet, doublet, and triplet charged scalar extensions that couple to leptons, and concluded that triplet and singlet scalar can contribute appreciably to NTP
Summary
Neutrino oscillation experiments provide conclusive evidence that the standard model (SM) is incomplete. [15], the upcoming beam dump experiments SHiP and DUNE [16,17] are sensitive to many previously unmeasured neutrino trident channels which contain mixed-flavor leptons in the final state. With these exciting new prospects the possibility of NTP serving as a powerful probe of scalar extensions seems highly probable. We find that charged scalars are best probed by NTP in the case of universal flavor diagonal couplings For these configurations, we find that mixed-flavor trident final states can give a 20%–50% increase in sensitivity to BSM couplings as compared to the traditional νμþμ−-trident channel, and outperforming bounds from the anomalous magnetic moment of the muon.
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