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We study the collider phenomenology of leptophilic axion-like particles (ALPs), i.e. pseudoscalar particles that couple only to charged leptons. Loops of charged leptons induce effective interactions of the ALPs with photons, which depend…

High Energy Physics - Phenomenology · Physics 2025-11-11 Alexander Eberhart , Marco Fedele , Felix Kahlhoefer , Eike Ravensburg , Robert Ziegler

We propose a fixed-target experiment to search for Axion-like particles (ALPs) coupling to photons, which utilizes electron and positron beams available at KEK Linac. The sensitivity to ALP is evaluated for two shielding setups in…

High Energy Physics - Phenomenology · Physics 2021-08-11 Akimasa Ishikawa , Yasuhito Sakaki , Yosuke Takubo

A significant number of high power proton beams are available or will go online in the near future. This provides exciting opportunities for new fixed target experiments and the search for new physics in particular. In this note we will…

High Energy Physics - Phenomenology · Physics 2019-05-21 Lucian Harland-Lang , Joerg Jaeckel , Michael Spannowsky

One kind of particularly interesting pseudoscalar particles, called axion-like particles (ALPs), have rich physical phenomenology at high- and low-energy collider experiments. After discussing most of single production channels of ALP at…

High Energy Physics - Phenomenology · Physics 2022-01-25 Chong-Xing Yue , Hua-Ying Zhang , Han Wang

Assuming the existence of an axion-like particle (ALP), beams of relativistic particles emit fluxes of quasi-real ALPs, analogous to the photon fluxes described by Weizs\"acker-Williams-type approximations. Consequently, ALP-ALP and…

High Energy Physics - Phenomenology · Physics 2025-11-04 Sergio Barbosa , Matheus Coelho , Sylvain Fichet , Gustavo Gil da Silveira , Magno Machado

Studies of axion-like particles (ALPs) commonly focus on a single type of interaction, for example couplings only to photons. Most ALP models however predict correlations between different couplings, which change the phenomenology in…

High Energy Physics - Phenomenology · Physics 2020-07-15 Fatih Ertas , Felix Kahlhoefer

Axion-Like Particles (ALPs) are a generic, calculable, and well motivated extension of the Standard Model with far reaching phenomenology. ALPs that couple only to hypercharge represent one subset of such models, coupling the ALP to both…

High Energy Physics - Phenomenology · Physics 2021-09-15 Noah Steinberg , James D. Wells

We provide a comprehensive analysis of the phenomenology of axion-like particles (ALPs) produced in core-collapse supernovae (ccSNe) through interactions with electrons and muons, both of which have a non-negligible abundance in the SN…

High Energy Physics - Phenomenology · Physics 2025-10-17 Ricardo Z. Ferreira , M. C. David Marsh , Eike Ravensburg

Experimental searches for axions or axion-like particles rely on semiclassical phenomena resulting from the postulated coupling of the axion to two photons. Sensitive probes of the extremely small coupling constant can be made by exploiting…

High Energy Physics - Experiment · Physics 2010-09-28 Aaron S. Chou

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

Axion-like particles (ALPs) are pseudo Nambu-Goldstone bosons of spontaneously broken global symmetries in high-energy extensions of the Standard Model (SM). This makes them a prime target for future experiments aiming to discover new…

High Energy Physics - Phenomenology · Physics 2020-08-19 Martin Bauer , Mathias Heiles , Matthias Neubert , Andrea Thamm

The parameter space of massive axion-like-particles (ALPs) with $m_a \sim {\mathcal O} (100)$ MeV and coupled with nucleons is largely unexplored. Here, we present new constraints in this parameter region. In doing so, we characterize the…

High Energy Physics - Phenomenology · Physics 2023-05-11 Alessandro Lella , Pierluca Carenza , Giuseppe Lucente , Maurizio Giannotti , Alessandro Mirizzi

Heavy axion-like particles (ALPs), with masses $m_a \gtrsim 100$ keV, coupled with photons, would be copiously produced in a supernova (SN) core via Primakoff process and photon coalescence. Using a state-of-the-art SN model, we revisit the…

High Energy Physics - Phenomenology · Physics 2020-12-07 Giuseppe Lucente , Pierluca Carenza , Tobias Fischer , Maurizio Giannotti , Alessandro Mirizzi

The Sun is a well-studied astrophysical source of axion-like particles (ALPs), produced mainly through the Primakoff process. Moreover, in the Sun there exist large-scale magnetic fields that catalyze an additional ALP production via a…

High Energy Physics - Phenomenology · Physics 2021-01-01 Ersilia Guarini , Pierluca Carenza , Javier Galan , Maurizio Giannotti , Alessandro Mirizzi

We explore the sensitivity of photon-beam experiments to axion-like particles (ALPs) with QCD-scale masses whose dominant coupling to the Standard Model is either to photons or gluons. We introduce a novel data-driven method that eliminates…

High Energy Physics - Phenomenology · Physics 2020-04-15 Daniel Aloni , Cristiano Fanelli , Yotam Soreq , Mike Williams

A nuclear reactor is a powerful tool to study neutrinos and light dark sector particles. Some of the reactor experiments have proven to be extremely useful already. Considering the great interest in the power of intensity frontier to search…

High Energy Physics - Phenomenology · Physics 2021-04-14 Patrick deNiverville , Hye-Sung Lee , Young-Min Lee

In light-shining-through-walls experiments, axions and axion-like particles (ALPs) are searched for by exposing an optically thick barrier to a laser beam. In a magnetic field, photons could convert into ALPs in front of the barrier and…

High Energy Physics - Phenomenology · Physics 2026-05-12 Vedran Brdar , Dibya S. Chattopadhyay

We propose a new search for Axion-Like Particles (ALPs), targeting Vector Boson Scattering (VBS) processes at the LHC. We consider nonresonant ALP-mediated VBS, where the ALP participates as an off-shell mediator. This process occurs…

High Energy Physics - Phenomenology · Physics 2022-06-23 J. Bonilla , I. Brivio , J. Machado-Rodríguez , J. F. de Trocóniz

In this work we revisit five different point sources within or behind galaxy clusters in order to constrain the coupling constant between axion-like particles (ALPs) and photons. We use three distinct machine learning (ML) techniques and…

Cosmology and Nongalactic Astrophysics · Physics 2022-06-15 Simon Schallmoser , Sven Krippendorf , Francesca Chadha-Day , Jochen Weller

X-ray telescopes are an exceptional tool for searching for new fundamental physics. In particular, X-ray observations have already placed world-leading bounds on the interaction between photons and axion-like particles (ALPs). ALPs are…

High Energy Physics - Phenomenology · Physics 2018-04-11 Francesca Day , Sven Krippendorf
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