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Axion-like particles (ALPs) are pseudo Nambu-Goldstone bosons associated with spontaneously broken global symmetries incorporated in the Standard Model (SM) Lagrangian in many models beyond the SM. The existence of a light ALP is plausible…

High Energy Physics - Phenomenology · Physics 2025-06-11 Shirin Chenarani , Mojtaba Mohammadi Najafabadi

We investigate the role of an axion-like particle (ALP) as a portal between the dark and visible sectors. Unlike conventional studies, which typically assume fermionic dark matter (DM), we explore the phenomenological implications of scalar…

High Energy Physics - Phenomenology · Physics 2025-07-08 Francesco D'Eramo , Tommaso Sassi

We consider a muonphilic axion-like-particle (ALP), denoted as $a$, lighter than twice the muon mass. ALPs of this mass range dominantly decay into a pair of photons, induced by a triangular muon loop. Such light muonphilic ALPs are…

High Energy Physics - Phenomenology · Physics 2022-12-07 Kingman Cheung , Jui-Lin Kuo , Po-Yan Tseng , Zeren Simon Wang

The goal of FASER, ForwArd Search ExpeRiment at the LHC, is to discover light, weakly-interacting particles with a small and inexpensive detector placed in the far-forward region of ATLAS or CMS. A promising location in an unused service…

High Energy Physics - Phenomenology · Physics 2021-11-18 Jonathan L. Feng , Iftah Galon , Felix Kling , Sebastian Trojanowski

We derive updated cosmological bounds on light axion-like particles (ALPs) coupled to leptons or photons, using a full phase-space treatment of their production from the primordial thermal plasma. The ALP phase-space distribution, obtained…

Cosmology and Nongalactic Astrophysics · Physics 2026-02-12 Nicola Barbieri , Luca Caloni , Martina Gerbino , Massimiliano Lattanzi , Luca Visinelli

The existence of an axion-like particle (ALP) would induce anomalous scattering of light by light. This process can be probed at the Large Hadron Collider in central exclusive production of photon pairs in proton-proton collisions by…

High Energy Physics - Phenomenology · Physics 2018-08-01 Cristian Baldenegro , Sylvain Fichet , Gero von Gersdorff , Christophe Royon

We have studied the signals from axion-like particles (ALPs) as dark matter mediators from celestial objects such as neutron stars, brown dwarfs or white dwarfs. We consider the accumulation of dark matter inside the celestial objects using…

High Energy Physics - Phenomenology · Physics 2024-10-25 Tanech Klangburam , Chakrit Pongkitivanichkul

Axion-like particles (ALPs) appear in various new physics models with spontaneous global symmetry breaking. When the ALP mass is in the range of MeV to GeV, the cosmology and astrophysics bounds are so far quite weak. In this work, we…

High Energy Physics - Phenomenology · Physics 2021-12-08 Jie Ren , Daohan Wang , Lei Wu , Jin Min Yang , Mengchao Zhang

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 investigate a scenario where Strongly Interacting Massive Particle (SIMP) dark matter interacts with an axion-like particle (ALP) that couples exclusively to electrons. This minimal setup provides interactions which enforce thermal…

High Energy Physics - Phenomenology · Physics 2026-04-13 Vincenzo Fiorentino , Ji-Heng Guo , Giacomo Landini , Federico Mescia

Axion-like particles (ALPs) are a common prediction of certain theories beyond the Standard Model and couple to photons in the presence of external magnetic fields. As a consequence, photon-ALP conversions could lead to an enhancement of…

High Energy Astrophysical Phenomena · Physics 2014-12-09 Manuel Meyer

We study prospects to detect axion-like particles (ALPs) with the upcoming near-infrared telescope SPHEREx. The signal under investigation is the ALP decay into two photons. Assuming dark matter (DM) to be in the form of ALPs, we analyze…

Cosmology and Nongalactic Astrophysics · Physics 2025-05-09 Marco Regis , Marco Taoso , Jorge Terol Calvo

Axion-like particles (ALPs) arise from well-motivated extensions to the Standard Model and could account for dark matter. ALP dark matter would manifest as a field oscillating at an (as of yet) unknown frequency. The frequency depends…

The excess of electron recoil events seen by the XENON1T experiment has been interpreted as a potential signal of axion-like particles (ALPs), either produced in the Sun, or constituting part of the dark matter halo of the Milky Way. It has…

Axion-like particles (ALPs) are interesting dark matter candidates both from the theoretical as well as from the experimental perspective. Usually they are motivated as pseudo-Nambu-Goldstone bosons. In this case one of their most important…

High Energy Physics - Phenomenology · Physics 2018-08-01 Gonzalo Alonso-Álvarez , Joerg Jaeckel

Axions or more generally axion-like particles (ALPs) are pseudo-scalar particles predicted by many extensions of the Standard Model of particle physics (SM) and considered as viable candidates for dark matter (DM) in the universe. If they…

High Energy Astrophysical Phenomena · Physics 2020-05-20 Ahmed Ayad , Geoff Beck

Axion Like Particles (ALPs), postulated to solve the strong-CP problem, are predicted to couple with photons in the presence of magnetic fields, which may lead to a significant change in the observed spectra of gamma-ray sources such as…

Cosmology and Nongalactic Astrophysics · Physics 2011-03-04 Miguel A. Sanchez-Conde

Most of the matter in the Universe is in the form of dark matter, which has evaded detection so far. Ultralight axionlike particles (ALPs) are a class of dark matter candidates that produce measurable signatures in the form of oscillating…

Atomic Physics · Physics 2026-03-27 Mingyu Fan , Bassam Nima , Aleksandar Radak , Gonzalo Alonso-Álvarez , Amar Vutha

Axion-like particles (ALPs) that decay into photon pairs pose a challenge for experiments that rely on the construction of a decay vertex in order to search for long-lived particles. This is particularly true for beam-dump experiments,…

High Energy Physics - Phenomenology · Physics 2024-07-30 Alessandro Morandini , Torben Ferber , Felix Kahlhoefer

Although axion-like particles (ALPs) are popular dark matter candidates, their mass generation mechanisms as well as cosmic thermal evolutions are still unclear. In this letter, we propose a new mass generation mechanism of ALP during the…

High Energy Physics - Phenomenology · Physics 2022-10-25 Wei Chao , Mingjie Jin , Hai-Jun Li , Ying-Quan Peng
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