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Constraints on axion-like particles with H.E.S.S. from observations of PKS 2155-304

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arxiv 1307.6068 v1 pith:56GTYCK3 submitted 2013-07-23 astro-ph.HE

Constraints on axion-like particles with H.E.S.S. from observations of PKS 2155-304

Pierre Brun , Denis Wouters (for the H.E.S.S. collaboration) This is my paper
classification astro-ph.HE
keywords axion-likeparticlesenergybosonsconstraintsgammalightobservations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Axion-like particles are hypothetical new light (sub-eV) bosons predicted in some extensions of the Standard Model of particle physics. In astrophysical environments comprising high-energy gamma rays and turbulent magnetic fields, the existence of axion-like particles can modify the energy spectrum of the gamma rays. This modification would take the form of an irregular behavior of the energy spectrum in a limited energy range. Data from the H.E.S.S. observations of the distant BL Lac PKS 2155-304 are used to derive conservative upper limits on the strength of the axion-like particle coupling to photons. This study gives rise to the first exclusions on axion-like particles from gamma-ray astronomy. The derived constraints apply to both light pseudo-scalar and scalar bosons that couple to the electromagnetic field.

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  1. Constraints on axion-like particles from ultra-high-energy observations of M87 with the HAWC observatory

    astro-ph.HE 2026-06 unverdicted novelty 4.0

    No photon-ALP conversion signal found in HAWC data from M87, producing competitive constraints excluding ALP masses of 10^{-8} to 10^{-6} eV for couplings above 5×10^{-12} GeV^{-1}.