Speaker
Description
Elastic light-by-light (LbL) scattering in ultraperipheral collisions (UPCs) of relativistic heavy ions provides a unique testing ground for Quantum Electrodynamics and searches for Beyond Standard Model (BSM) physics. We investigate the impact of linearly polarized coherent photons on the azimuthal angular correlations of the final-state photons. We demonstrate that the linear polarization generates a significant cos 2ϕ modulation in the Standard Model background. Crucially,we identify a highly non-trivial invariant mass dependence of the cos 2ϕ and cos 4ϕ azimuthal asymmetries in the vicinity of a massive axion-like particle (ALP) resonance. This distinct signature offers a clean and direct window to search for BSM particles in UPCs, potentially enhancing the sensitivity of future searches at the LHC and EIC.
| 请选择分会 | 高能重离子物理 |
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