Search for sub-eV scalar and pseudoscalar resonances via four-wave mixing with a laser collider

TL;DR

This study searches for low-mass scalar and pseudoscalar particles using four-wave mixing in laser collisions, setting new upper limits on their coupling strengths below 0.15 eV.

Contribution

It introduces a laboratory method to probe sub-eV fields via resonant four-wave mixing with combined laser fields, providing new constraints.

Findings

No significant four-wave mixing signal detected.

Upper limits established on coupling-mass relation for scalar and pseudoscalar fields.

Constraints apply to mass region below 0.15 eV.

Abstract

The quasi-parallel photon-photon scattering by combining two-color laser fields is an approach to produce resonant states of low-mass fields in laboratory. In this system resonances can be probed via the four-wave mixing process in the vacuum. A search for scalar and pseudoscalar fields was performed by combining 9.3 $\mu$J/0.9 ps Ti-Sapphire laser and 100 $\mu$J/9 ns Nd:YAG laser. No significant signal of four-wave mixing was observed. We provide the upper limits on the coupling-mass relation for scalar and pseudoscalar fields, respectively, at a 95\% confidence level in the mass region below 0.15~eV.