Polarized light-by-light scattering at the CLIC induced by axion-like particles

Abstract

The light-by-light (LBL) scattering with initial polarized Compton backscattered photons at the CLIC, induced by axion-like particles (ALPs), is investigated. The total cross sections are calculated, assuming CP-even coupling of the pseudoscalar ALP to photons. The 95\% C.L. exclusion region for the ALP mass $m_a$ and its coupling constant $f$ is presented. The results are compared with previously obtained CLIC bounds for the unpolarized case. It is shown that the bounds on $f$ for the polarized beams in the region $m_a=1000\mathrm{GeV}-2000\mathrm{GeV}$, with the collision energy 3000 GeV and integrated luminosity 4000 fb${}^{-1}$, are on average 1.5 times stronger than the bounds for the unpolarized beams. Herewith, our CLIC bounds are stronger than all current exclusion regions for $m_a>80$ GeV. In particular, they are more restrictive than the limits which follow from the ALP-mediated LBL scattering at the LHC.

Comments: 19 pages, 9 figures. Abstract is corrected. Several formulas are added. Figures 2,3 and 9 are combined into two figures 2 and 3. Summary plot is added. To be published in Chinese Physics C