Probing anomalous quartic $γγγγ$ couplings in light-by-light collisions at the CLIC

Abstract

The anomalous quartic neutral couplings of the γγγγ vertex in a polarized light-by-light scattering of the Compton backscattered photons at the CLIC are examined. Both differential and total cross sections are calculated for e + e − collision energies 1500 GeV and 3000 GeV. The helicity of the initial electron beams is taken to be ± 0.8. The unpolarized and SM cross sections for the same values of helicities are also estimated. The 95% C.L. exclusion limits on two anomalous photon couplings ζ 1 and ζ 2 are calculated. The best bounds on these couplings are found to be 4.58×10 −16 GeV −4 and 9.37×10 −16 GeV −4 , respectively. The results are compared with the exclusion bounds obtained previously for the LHC. It is shown that the light-by-light scattering at the CLIC has a greater potential to search for the anomalous quartic neutral couplings of the γγγγ vertex.

Search for invisible dark photon in $$\gamma e$$ scattering at future lepton colliders

“…Among they are (i) Higgs can be s-channel produced; (ii) higher cross sections for charged particles; (iii) higher mass reach in some channels; (iv) pure QED interaction (in e + e − a Z boson exchange is present); (v) higher polarization of initial states. The γ e and γ γ modes were considered for a number of processes at the future lepton colliders [106][107][108][109][110][111][112][113][114][115][116][117], Let E 0 be the energy of the initial laser photon beam, E e be the energy of the initial electron beam, while E γ be the energy of the Compton backscattered (CB) photon. The differential cross section for the unpolarized DP production accompanied by electron at the lepton collider operating in the γ e mode is defined as…”