Speaker
Description
If a light neutral beyond standard model scalar $\phi$ couples exclusively to the active neutrinos, then the dominant production channel of such a light neutral scalar at the LHC is through the fusion of two same-sign $W$ bosons. As $\phi$ decays only into neutrinos, the production of $\phi$ at LHC induces the signal of same-sign dilepton plus two forward jets plus missing transverse energy. The proposed final state allows us to probe a large range of $m_\phi$ up to ~200 GeV where there is currently no direct LHC limit. The $\phi$ couplings $\lambda_{ee,\, e\mu,\, \mu\mu}$ to neutrinos can be probed respectively up to 0.75, 0.71 and 0.71 at the high-luminosity LHC, and the direct measurements of the $\phi$ couplings at the high-energy colliders are largely complementary to the low-energy limits.
