Constraining axion-like particles with the diffuse gamma-ray flux measured by the Large High Altitude Air Shower Observatory
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Constraining axion-like particles with the diffuse gamma-ray flux measured by the Large High Altitude Air Shower Observatory. / Mastrototaro, Leonardo; Carenza, Pierluca; Chianese, Marco; Fiorillo, Damiano F. G.; Miele, Gennaro; Mirizzi, Alessandro; Montanino, Daniele.
I: European Physical Journal C, Bind 82, Nr. 11, 1012, 11.11.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Constraining axion-like particles with the diffuse gamma-ray flux measured by the Large High Altitude Air Shower Observatory
AU - Mastrototaro, Leonardo
AU - Carenza, Pierluca
AU - Chianese, Marco
AU - Fiorillo, Damiano F. G.
AU - Miele, Gennaro
AU - Mirizzi, Alessandro
AU - Montanino, Daniele
PY - 2022/11/11
Y1 - 2022/11/11
N2 - The detection of very high-energy neutrinos by IceCube experiment supports the existence of a comparable gamma-ray counterpart from the same cosmic accelerators. Under the likely assumption that the sources of these particles are of extragalactic origin, the emitted photon flux would be significantly absorbed during its propagation over cosmic distances. However, in the presence of photon mixing with ultra-light axion-like-particles (ALPs), this expectation would be strongly modified. Notably, photon-ALP conversions in the host galaxy would produce an ALP flux which propagates unimpeded in the extragalactic space. Then, the back-conversion of ALPs in the Galactic magnetic field leads to a diffuse high-energy photon flux. In this context, the recent detection of the diffuse high-energy photon flux by the Large High Altitude Air Shower Observatory (LHAASO) allows us to exclude at the 95% CL an ALP-photon coupling g(alpha gamma) greater than or similar to 3.9-7.8 x 10(-11) GeV-1 for m(a) less than or similar to 4 x 10(-7) eV, depending on the assumptions on the magnetic fields and on the original gamma-ray spectrum. This new bound is complementary with other ALP constraints from very-high-energy gamma-ray experiments and sensitivities of future experiments.
AB - The detection of very high-energy neutrinos by IceCube experiment supports the existence of a comparable gamma-ray counterpart from the same cosmic accelerators. Under the likely assumption that the sources of these particles are of extragalactic origin, the emitted photon flux would be significantly absorbed during its propagation over cosmic distances. However, in the presence of photon mixing with ultra-light axion-like-particles (ALPs), this expectation would be strongly modified. Notably, photon-ALP conversions in the host galaxy would produce an ALP flux which propagates unimpeded in the extragalactic space. Then, the back-conversion of ALPs in the Galactic magnetic field leads to a diffuse high-energy photon flux. In this context, the recent detection of the diffuse high-energy photon flux by the Large High Altitude Air Shower Observatory (LHAASO) allows us to exclude at the 95% CL an ALP-photon coupling g(alpha gamma) greater than or similar to 3.9-7.8 x 10(-11) GeV-1 for m(a) less than or similar to 4 x 10(-7) eV, depending on the assumptions on the magnetic fields and on the original gamma-ray spectrum. This new bound is complementary with other ALP constraints from very-high-energy gamma-ray experiments and sensitivities of future experiments.
KW - HIGH-ENERGY NEUTRINOS
KW - MAGNETIC-FIELDS
KW - PHOTON
KW - EVOLUTION
KW - GALAXIES
KW - UNIVERSE
U2 - 10.1140/epjc/s10052-022-10979-6
DO - 10.1140/epjc/s10052-022-10979-6
M3 - Journal article
VL - 82
JO - The European Physical Journal C: Particles and Fields
JF - The European Physical Journal C: Particles and Fields
SN - 1434-6044
IS - 11
M1 - 1012
ER -
ID: 326729377