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As part of experimental measurements by the ATLAS collaboration during 2015 and 2018 years of light-on-light scattering in Pb+Pb collisions, at an integrated luminosity of 2.2 nb$^{-1}$ and energy of 5.02 TeV, we modeled the cross sections…

High Energy Physics - Phenomenology · Physics 2026-02-24 T. V. Obikhod , S. B. Chernyshenko

We examine a contribution of axion-like particles (ALPs) to a top pair production via the collision of Compton backscattered photons at the CLIC operating in a $\gamma\gamma$ mode. The exclusion bounds on the ALP-top quark coupling…

High Energy Physics - Phenomenology · Physics 2025-06-04 S. C. İnan , A. V. Kisselev

Various satellite-borne missions are being planned whose goal is to measure the polarization of a large number of gamma-ray bursts (GRBs). We show that the polarization pattern predicted by current models of GRB emission can be drastically…

High Energy Astrophysical Phenomena · Physics 2014-11-20 Nicola Bassan , Alessandro Mirizzi , Marco Roncadelli

Axion-like particles (ALPs) can induce localised oscillatory modulations in the spectra of photon sources passing through astrophysical magnetic fields. Ultra-deep Chandra observations of the Perseus cluster contain over $5 \times 10^5$…

High Energy Astrophysical Phenomena · Physics 2017-10-04 Marcus Berg , Joseph P. Conlon , Francesca Day , Nicholas Jennings , Sven Krippendorf , Andrew J. Powell , Markus Rummel

Axion Like Particles (ALPs) with a sub-keV range mass are searched by using the light-shining-through-a-wall technique. A novel system is developed in which injected X rays are converted and reconverted by the Laue-case conversion within a…

High Energy Physics - Experiment · Physics 2018-06-26 T. Yamaji , K. Tamasaku , T. Namba , T. Yamazaki , Y. Seino

Axion like particles (ALPs) are fundamental pseudo scalar particles with properties similar to Axions which are a well-known extension of the standard model to solve the strong CP problem in Quantum Chromodynamics. ALPs can oscillate into…

High Energy Astrophysical Phenomena · Physics 2017-10-30 Jhilik Majumdar , Francesca Calore , Dieter Horns

In this mini-review, possible manifestations of mixing between axion-like particles (ALPs) and energetic photons propagating over astronomical distances are considered. We discuss the evidence for the anomalous transparency of the Universe…

High Energy Astrophysical Phenomena · Physics 2020-04-20 S. V. Troitsky

Axionlike particles (ALPs) are a common prediction of theories beyond the Standard Model of particle physics that could explain the entirety of the cold dark matter. These particles could be detected through their mixing with photons in…

High Energy Astrophysical Phenomena · Physics 2019-08-14 Manuel Meyer

Axion-like particles (ALPs) are predicted in some well-motivated theories beyond the Standard Model. The TeV gamma-rays from active galactic nuclei (AGN) suffer attenuation by the pair production interactions with the cosmic background…

High Energy Astrophysical Phenomena · Physics 2021-10-11 Guangbo Long , Siyu Chen , Shuo Xu , Hong-Hao Zhang

Axion-like-particles (ALPs) emitted from the core of a magnetar can convert to photons in its magnetosphere. The resulting photon flux is sensitive to the product of $(i)$ the ALP-nucleon coupling $G_{an}$ which controls the production…

High Energy Astrophysical Phenomena · Physics 2021-01-20 Sheridan J. Lloyd , Paula M. Chadwick , Anthony M. Brown , Huai-ke Guo , Kuver Sinha

Recently it has been pointed out that a cosmic background of relativistic axion-like particles (ALPs) would be produced by the primordial decays of heavy fields in the post-inflation epoch, contributing to the extra-radiation content in the…

Cosmology and Nongalactic Astrophysics · Physics 2016-05-25 Carmelo Evoli , Matteo Leo , Alessandro Mirizzi , Daniele Montanino

We study cross correlations between line intensity and weak lensing maps to search for axion-like particles (ALPs). Radiative decay of eV-mass ALPs can contribute to cosmic background emissions at optical and infrared wavelengths. Line…

Cosmology and Nongalactic Astrophysics · Physics 2021-05-26 Masato Shirasaki

Coupling of axion-like particles (ALPs) to photons in the presence of background magnetic field affects propagation of gamma-rays through magnetized environments. This results in modification in the gamma-ray spectra of sources in or behind…

High Energy Astrophysical Phenomena · Physics 2018-05-14 D. Malyshev , A. Neronov , D. Semikoz , A. Santangelo , J. Jochum

Axion-like particles (ALPs) are very light, neutral, spin zero bosons predicted by many theories which try to complete the standard model of elementary particles. ALPs interact primarily with two photons and can generate photon-ALP…

High Energy Astrophysical Phenomena · Physics 2023-02-09 Giorgio Galanti

High-energy neutrino observation from the Seyfert galaxy NGC 1068 offers new insights into the non-thermal processes of active galactic nuclei. Simultaneous gamma-rays emitted by such sources can possibly oscillate into axion-like particles…

High Energy Physics - Phenomenology · Physics 2025-06-18 Ariane Dekker , Gonzalo Herrera , Dimitrios Kantzas

The Fermi-LAT observations of SN 2023ixf, a Type II supernova in the nearby Pinwheel Galaxy, Messier 101 (M101), presents us with an excellent opportunity to constrain MeV-scale Axion-Like Particles (ALPs). By examining the photon decay…

High Energy Astrophysical Phenomena · Physics 2024-01-18 Eike Ravensburg , Pierluca Carenza , Christopher Eckner , Ariel Goobar

Axion-like particles (ALPs) provide a feasible explanation for the observed lower TeV opacity of the Universe. If the anomaly TeV transparency is caused by ALPs, then the fluxes of distant extragalactic sources will be enhanced at photon…

High Energy Astrophysical Phenomena · Physics 2021-11-17 Yun-Feng Liang , Xing-Fu Zhang , Ji-Gui Cheng , Hou-Dun Zeng , Yi-Zhong Fan , En-Wei Liang

Axions and axion-like particles (ALPs) have gained immense attention in searches for beyond Standard Model (BSM) physics. Experiments searching for axions leverage their predicted couplings to Standard Model (SM) particles to look for…

High Energy Physics - Phenomenology · Physics 2026-03-24 Tanmoy Kumar , N. P. S. Mithun , Subhendra Mohanty , Sourov Roy , B. S. Bharath Saiguhan , Santosh Vadawale

Axions and axion-like particles (ALPs) arise naturally in many extensions of the Standard Model and are among the well-motivated candidates for dark matter. In the presence of magnetic fields of galaxy clusters, Cosmic Microwave Background…

Cosmology and Nongalactic Astrophysics · Physics 2026-03-11 Harsh Mehta , Anaya Dixit , Suvodip Mukherjee , Joseph Silk