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

TL;DR

This paper investigates how polarized light-by-light scattering at CLIC can set stronger bounds on axion-like particles than unpolarized methods and current experiments, especially for masses above 80 GeV.

Contribution

It demonstrates that polarized beams at CLIC improve constraints on ALP parameters compared to unpolarized beams and existing bounds.

Findings

Polarized light-by-light scattering yields 1.5 times stronger bounds on ALPs than unpolarized.

CLIC bounds surpass current exclusion regions for ALP masses over 80 GeV.

Results show improved sensitivity for ALPs with masses between 1000 and 2000 GeV.

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.