Abstract
We explore the collider prospects of neutrino non-standard interaction with a Standard Model (SM) gauge-singlet leptonic scalar ϕ carrying two units of lepton-number-charge. These leptonic scalars are forbidden from interacting with the SM fermions at the renormalizable level and, if one allows for higher-dimensional operators, couple predominantly to SM neutrinos. For masses at or below the electroweak scale, ϕ decays exclusively into neutrinos. Its characteristic production signature at hadron collider experiments like the LHC would be via the vector boson fusion process and leads to same-sign dileptons, two forward jets in opposite hemispheres, and missing transverse energy, i.e., ppto {mathrm{ell}}_{alpha}^{pm }{mathrm{ell}}_{beta}^{pm } jj+{E}_T^{mathrm{miss}}left(alpha, beta =e,mu, tau right) . Exploiting the final states of electrons and muons, we estimate, for the first time, the sensitivity of the LHC to these lepton-number-charged scalars. We show that the LHC sensitivity is largely complementary to that of low-energy precision measurements of the decays of charged leptons, charged mesons, W, Z and the SM Higgs boson, as well as the neutrino beam experiments like MINOS, and searches for neutrino self-interactions at IceCube and in cosmological observations. For ϕ mass larger than roughly 10 GeV, our projected LHC sensitivity would surpass all existing bounds.
Highlights
We explore the collider prospects of neutrino non-standard interaction with a Standard Model (SM) gauge-singlet leptonic scalar φ carrying two units of lepton-numbercharge
We show that the LHC sensitivity is largely complementary to that of low-energy precision measurements of the decays of charged leptons, charged mesons, W, Z and the SM Higgs boson, as well as the neutrino beam experiments like MINOS, and searches for neutrino self-interactions at IceCube and in cosmological observations
We show that high-energy colliders like LHC provide a novel complementary probe of the couplings λαβ through the vector-boson fusion (VBF) process (1.2) that extends the experimental reach to relatively higher φ masses
Summary
The scalar mass mφ and the couplings λαβ are constrained by a variety of high-precision data at low energy [5, 26, 27]. We focus mainly on the constraints for mφ > 100 MeV, including decay rates of tauon and charged mesons, the searches of heavy neutrinos from charged meson decays, the invisible decay width of Z boson and SM Higgs boson h, the production and decays of W boson at colliders, neutrino-matter scatting in neutrino beam experiments MINOS and DUNE, and the IceCube and cosmic microwave background (CMB) limits on the new neutrino-neutrino interactions. All of these limits are collected in table 1 and detailed in the following subsections 2.1–2.8. We will comment on the limits on τ -flavor relevant couplings in the text, when they are applicable
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