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Photoproduction of Axionlike Particles
Daniel Aloni1, Cristiano Fanelli2, Yotam Soreq3,4
1Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel.
Physical Review Letters
|September 7, 2019
Summary
This study enhances searches for axionlike particles (ALPs) using novel methods for photon-beam experiments. Existing data could significantly improve ALP sensitivity, setting new world-leading limits on ALP couplings.
Area of Science:
- Particle Physics
- High Energy Physics
- Experimental Physics
Background:
- Axionlike particles (ALPs) are hypothetical particles with potential connections to dark matter and the early universe.
- Photon-beam experiments offer a promising avenue for detecting ALPs, particularly those with QCD-scale masses.
- Previous searches were limited by uncertainties in nuclear form factors and photon-beam flux.
Purpose of the Study:
- To explore the sensitivity of photon-beam experiments to ALPs coupled to photons or gluons.
- To develop a novel data-driven method for analyzing coherent Primakoff production.
- To set new limits on ALP-photon and ALP-gluon couplings.
Main Methods:
- Introduced a data-driven method for coherent Primakoff production, removing dependence on nuclear form factors and photon-beam flux.
- Reanalyzed existing PrimEx experiment data from 2004.
- Simulated future sensitivity of the GlueX experiment with a nuclear target and a PrimEx-like calorimeter.
- Studied photoproduction of ALPs coupling to gluons for the first time.
Main Results:
- Existing PrimEx data could improve sensitivity to ALPs (0.03≲m_{a}≲0.3 GeV) by an order of magnitude.
- Predicted future sensitivity for the GlueX experiment for ALPs coupling to gluons.
- Established world-leading limits on both ALP-gluon and ALP-photon couplings using public mass plots.
Conclusions:
- Photon-beam experiments, with novel analysis techniques, are powerful tools for discovering ALPs.
- The proposed methods significantly enhance the reach of current and future experiments.
- This work provides stringent constraints on fundamental parameters in particle physics.
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