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Axion
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=== Searches at particle colliders === Axions may also be produced at colliders, in particular in electron-positron collisions as well as in ultra-peripheral heavy ion collisions at the Large Hadron Collider at CERN, reinterpreting the [[Two-photon physics|light-by-light scattering]] process. Those searches are sensitive for rather large axion masses between {{val|100|u=MeV/c2}} and hundreds of {{val|u=GeV/c2}}. Assuming a coupling of axions to the Higgs boson, searches for anomalous Higgs boson decays into two axions can theoretically provide even stronger limits.<ref>{{cite journal |last1=Bauer |first1=Martin |last2=Neubert |first2=Matthias |last3=Thamm |first3=Andrea |date=December 2017 |title=Collider Probes of Axion-Like Particles |journal=Journal of High Energy Physics |volume=2017 |issue=12 |page=44 |doi=10.1007/JHEP12(2017)044 |arxiv=1708.00443 |bibcode=2017JHEP...12..044B |s2cid=119422560 }}</ref>
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