Abstract
New gauge bosons coupling to leptons are simple and well-motivated extensions of the Standard Model. We study the sensitivity to gauged $L_{\mu} -L_{e}$, $L_e-L_\tau$ and $L_{\mu} -L_{\tau}$ both with the existing beam dump mode data of MiniBooNE and with the DUNE near detector. We find that including bremsstrahlung and resonant production of $Z'$ which decays to $e^{\pm}$ and $\mu^{\pm}$ final states leads to a significant improvement in existing bounds, especially for $L_\mu-L_e$ and $L_e-L_\tau$ for DUNE while competitive constraints can be achieved with the existing data from the MiniBooNE's beam dump run.
Highlights
Despite the presence of several hints in favor of the existence of physics beyond the Standard Model (BSM), such as neutrino masses, dark matter, and dark energy, the scale at which this new physics resides is unknown
The purpose of our work is to show that the Z0 production from both bremsstrahlung and on-shell resonance in DUNE can significantly improve the prospective sensitivity to Lα − Lβ gauge boson
Prospective constraints of DUNE on both Lμ − Le and Lμ − Lτ were already derived in [5], a comparison with the results obtained therein is in order
Summary
Despite the presence of several hints in favor of the existence of physics beyond the Standard Model (BSM), such as neutrino masses, dark matter, and dark energy, the scale at which this new physics resides is unknown. It has been pointed out that the charged mesons created in proton beam interactions can produce a relatively large number of Z0, whose subsequent decay into lepton pairs induces a sizeable signal in the detector This will improve current constraints, but only for Lμ − Lτ and only in a narrow window of masses around 5–10 MeV. The purpose of our work is to show that the Z0 production from both bremsstrahlung and on-shell resonance in DUNE can significantly improve the prospective sensitivity to Lα − Lβ gauge boson Another result of our work is that the existing data collected in the beam dump mode of MiniBooNE [12] provides already competitive bounds. VII, we discuss the detailed assumptions underlying these constraints and compare them to the MiniBooNE and DUNE sensitivity obtained in this work
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