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This article analyzes photon-to-axion-like-particle conversion in intense laser fields, focusing on the interference between scalar and pseudoscalar couplings to derive specific polarization signatures for detecting ALPs. The study proposes using collision angle scans as a kinematic method to resolve resonant ALP masses through distinct polarization rotation patterns.
Polarization signatures of mixed scalar - pseudoscalar ALP - photon couplings in intense laser pulses
arXiv:2610.28144v1 Announce Type: cross Abstract: We investigate photon-to-axion-like-particle (ALP) conversion in a finite, linearly polarized laser pulse for a single ALP field with simultaneous scalar-type and pseudoscalar-type couplings to photons. Varying the collision angle between the strong pulse and the probe provides a continuous kinematic scan of the resonant ALP mass. For fixed kinematics in this setting, the scalar-type and pseudoscalar-type ALP conversion amplitudes interfere coherently, making both the photon-to-ALP conversion probability and the polarization rotation depend on the difference between the probe polarization angle $\alpha$ and the coupling angle $\theta_g$. Conversion is maximal at $|\alpha-\theta_g|=90^\circ$, where the polarization rotation vanishes, while the rotation magnitude peaks at $\alpha-\theta_g=45^\circ$ modulo $90^\circ$, where conversion is half-maximal. These complementary polarization-angle dependences provide polarization-resolved signatures of mixed scalar--pseudoscalar photon couplings.
Abstract:We investigate photon-to-axion-like-particle (ALP) conversion in a finite, linearly polarized laser pulse for a single ALP field with simultaneous scalar-type and pseudoscalar-type couplings to photons. Varying the collision angle between the strong pulse and the probe provides a continuous kinematic scan of the resonant ALP mass. For fixed kinematics in this setting, the scalar-type and pseudoscalar-type ALP conversion amplitudes interfere coherently, making both the photon-to-ALP conversion probability and the polarization rotation depend on the difference between the probe polarization angle $\alpha$ and the coupling angle $\theta_g$. Conversion is maximal at $|\alpha-\theta_g|=90^\circ$, where the polarization rotation vanishes, while the rotation magnitude peaks at $\alpha-\theta_g=45^\circ$ modulo $90^\circ$, where conversion is half-maximal. These complementary polarization-angle dependences provide polarization-resolved signatures of mixed scalar--pseudoscalar photon couplings.
arXiv:2610.28144 [hep-ph]
(or arXiv:2610.28144v1 [hep-ph] for this version)
https://doi.org/10.48550/arXiv.2610.28144 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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