Abstract
The self-couplings of the electroweak gauge bosons are completely specified by the non-Abelian gauge nature of the Standard Model (SM). The direct study of these couplings provides a significant opportunity to test the validity of the SM and the existence of new physics beyond the SM up to the high energy scale. For this reason, we investigate the potential of the processes γγ→ZZ, e-γ→e-γ⁎γ→e-ZZ, and e+e-→e+γ⁎γ⁎e-→e+ZZe- to examine the anomalous quartic couplings of ZZγγ vertex at the Compact Linear Collider (CLIC) with center-of-mass energy 3 TeV. We calculate 95% confidence level sensitivities on the dimension-8 parameters with various values of the integrated luminosity. We show that the best bounds on the anomalous fM2/Λ4, fM3/Λ4, fT0/Λ4, and fT9/Λ4 couplings arising from γγ→ZZ process among those three processes at center-of-mass energy of 3 TeV and integrated luminosity of Lint=2000 fb−1 are found to be [-3.30;3.30]×10-3 TeV−4, [-1.20;1.20]×10-2 TeV−4, [-3.40;3.40]×10-3 TeV−4, and [-1.80;1.80]×10-3 TeV−4, respectively.
Highlights
The Standard Model (SM) of particle physics has been tested with a lot of different experiments for decades and it is proven to be extremely successful
Where Fμ] = ∂μA] − ∂]Aμ is the tensor for electromagnetic field tensor, a0,c are the dimensionless anomalous quartic coupling constants, and Λ is a mass-dimension parameter associated with the scale of new physics
The luminosity reduction factor is taken into account in γγ and eγ collision modes, the results show that γγ collisions give the best bounds to test anomalous quartic gauge couplings with respect to γ∗γ∗ and γγ∗ collisions
Summary
The SM of particle physics has been tested with a lot of different experiments for decades and it is proven to be extremely successful. The structure of gauge boson self-interactions is completely determined by the nonAbelian SU(2)L ⊗ U(1)Y gauge symmetry in the SM Contributions to these interactions, beyond those coming from the SM, will be a supporting evidence of probable new physics. It can be examined in a model independent way via the effective Lagrangian approach. Such an approach is parameterized by high-dimensional operators which induce anomalous quartic gauge couplings that modify the interactions between the electroweak gauge bosons. Where Fμ] = ∂μA] − ∂]Aμ is the tensor for electromagnetic field tensor, a0,c are the dimensionless anomalous quartic coupling constants, and Λ is a mass-dimension parameter associated with the scale of new physics. Studies have been done on anomalous quartic ZZγγ couplings via the processes pp → Zγγ [18], pp(p) → γγll [19], pp → pγ∗γ∗p → pZZp [20,21,22,23], pp → pγ∗p → pZZqX [24], pp → pγ∗p → pγZqX [25], and pp → qqγll [26]
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