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20232026
most citedConstraints on Extragalactic Background Light using TeV Observations of BL Lacertae objects

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astro-ph.HE2026

Multi-Period Fermi-LAT and LHAASO Constraints on Axion-Like Particles from Mrk 421 via Profile Likelihood with Gaussian Copula Correlation

Longhua Qin, Jiancheng Wang, Chuyuan Yang +9

We present a joint multi-period analysis of axion-like particles (ALPs) using five sets of simultaneous Fermi-LAT and LHAASO observations of the TeV blazar Mrk~421. Photon-ALP osci…