New bounds on heavy axions with an X-ray free electron laser
arxiv(2024)
摘要
We present new exclusion bounds obtained at the European X-ray Free Electron
Laser facility (EuXFEL) on axion-like particles (ALPs) in the mass range
10^-3 eV≲ m_a ≲ 10^4 eV, which is relatively
unconstrained by laboratory searches. Our experiment exploits the Primakoff
effect via which photons can, in the presence of a strong external electric
field, decay into axions, which then convert back into photons after passing
through an opaque wall. While similar searches have been performed previously
at a 3^ rd generation synchrotron our work
demonstrates improved sensitivity, exploiting the higher brightness of X-rays
at EuXFEL.
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