Associated production of neutrino and dark fermion at future lepton colliders
Shao-Feng Ge,
Kai Ma,
Xiao-Dong Ma
et al.
Abstract:Fermionic dark matter can be pairly produced and hence searched with missing energy at colliders. We extend such probe to the associated production of a neutrino and a dark sector fermion at the future e+e− colliders such as CEPC, FCC-ee, ILC, and CLIC. Two typical processes, the mono-photon and electron-positron pair productions associated with missing energy, can serve the purpose. While the mono-photon search prevails at CEPC, FCC-ee, and ILC, the "Image missing" channel has more significant contributions a… Show more
“…Mono-X, (X ∈ γ, j, Z, H) plus missing energy ( / E) final state is one of the popular probes to search for DM at colliders. The signal of our interest is mono-γ, which has been studied widely at the lepton colliders [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Noticeably, this final state with ISR photon has similar / E event distribution to the huge SM neutrino background (ν νγ), making it difficult for signal-background separation (see supplemental material).…”
We consider higher-dimensional effective (EFT) operators consisting of fermion dark matter (DM) connecting to Standard Model (SM) leptons upto dimension six. Considering all operators together and assuming the DM to undergo thermal freeze-out, we find out relic density allowed parameter space in terms of DM mass (mχ) and New Physics (NP) scale (Λ) with one loop direct search constraints from XENON1T experiment. Allowed parameter space of the model is probed at the proposed International Linear Collider (ILC) via monophoton signal for both Dirac and Majorana cases, limited by the centre-of-mass energy $$ \sqrt{s} $$
s
=1 TeV, where DM mass can be probed within $$ {m}_{\chi }<\frac{\sqrt{s}}{2} $$
m
χ
<
s
2
for the pair production to occur and Λ >$$ \sqrt{s} $$
s
for the validity of EFT framework.
“…Mono-X, (X ∈ γ, j, Z, H) plus missing energy ( / E) final state is one of the popular probes to search for DM at colliders. The signal of our interest is mono-γ, which has been studied widely at the lepton colliders [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Noticeably, this final state with ISR photon has similar / E event distribution to the huge SM neutrino background (ν νγ), making it difficult for signal-background separation (see supplemental material).…”
We consider higher-dimensional effective (EFT) operators consisting of fermion dark matter (DM) connecting to Standard Model (SM) leptons upto dimension six. Considering all operators together and assuming the DM to undergo thermal freeze-out, we find out relic density allowed parameter space in terms of DM mass (mχ) and New Physics (NP) scale (Λ) with one loop direct search constraints from XENON1T experiment. Allowed parameter space of the model is probed at the proposed International Linear Collider (ILC) via monophoton signal for both Dirac and Majorana cases, limited by the centre-of-mass energy $$ \sqrt{s} $$
s
=1 TeV, where DM mass can be probed within $$ {m}_{\chi }<\frac{\sqrt{s}}{2} $$
m
χ
<
s
2
for the pair production to occur and Λ >$$ \sqrt{s} $$
s
for the validity of EFT framework.
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