Year: 2025
Type: preprint
Abstract: 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 on the momenta of the interacting particles and differ between pseudoscalar and derivative lepton couplings. We systematically discuss the form of the interaction with photons for general external momenta and identify the regimes when it can be safely approximated by an effective coupling constant. We use these results to derive novel constraints from LEP and calculate state-of-the-art limits from E137 and NA64 for four different scenarios, in which the ALPs couple either to a single lepton generation or universally to all, for both pseudoscalar and derivative lepton couplings. We collect complementary bounds from astrophysics, flavour, and other laboratory experiments to chart the allowed parameter space of leptophilic ALPs in the MeV-GeV mass range.
Source: arXiv (Cornell University)
Institutions: Karlsruhe Institute of Technology, Universitat de València, Johannes Gutenberg University Mainz, Parc Científic de la Universitat de València, Instituto de Física Corpuscular, Mainz Institute for Theoretical Physics, Stockholm University, University of Southern Denmark, Centre for Cosmology and Particle Physics Phenomenology
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1175115578, G1422035950, G1664065723, TRR 257: Phänomenologische Elementarteilchenphysik nach der HiggsEntdeckung, G210041235, G2121348967, G2215508199, G2262748287, G2601397997, G2645866196, G2756433129, G2762820993, EXC 2118: Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA+), G300979063, Hunting Invisibles: Dark sectors, Dark matter and Neutrinos, G34346518, G3480869486, G3681454997, G4042783231, G425668148, G434337789, G5080475149, G5195188938, G6237201456, G6417970939, G7084143925, G7133536890, G792975244, G8404905901, G8657893973
OpenAlex ID: W6979302475
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