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SUMMARY:The axion-photon coupling from lattice Quantum Chromodynamics
DTSTART:20260917T071000Z
DTEND:20260917T081000Z
DTSTAMP:20260910T220200Z
UID:indico-event-30766@indico.ihep.ac.cn
DESCRIPTION:Speakers: José Javier  Hernández Hernández (Central China N
 ormal University)\n\nThe axion is a prime dark matter candidate that aditi
 onally solves the strong CP problem. Its experimental detection relies on 
 the axion-photon coupling\, which receives a model-independent contributio
 n from Quantum Chromodynamics (QCD). Previously\, this contribution was on
 ly estimated via different variants of Chiral Perturbation Theory (ChPT) w
 ith inconsistent results. We present the first non-perturbative\, first-pr
 inciples determination of the QCD axion-photon coupling using continuum-ex
 trapolated lattice simulations. We obtain $g_{A\\gamma\\gamma}^{\\rm QCD} 
 = -1.77(8)\\alpha_{em}/(2\\pi f_A)$\, which is about 10% smaller in magnit
 ude than the ChPT prediction quoted by the PDG. In this talk we will descr
 ibe how this quantity can be extracted by studying the response of the QCD
  vacuum to a time-reversal violating combination of electromagnetic fields
  and discuss how our result modifies the constraints over the landscape of
  viable axion models\, providing guidance for ongoing and future experimen
 tal searches.\nBased on arXiv:2603.29153\n\nBio:\nJosé Javier Hernández 
 Hernández is a postdoctoral researcher at the Institute of Particle Physi
 cs\, Central China Normal University\, in Wuhan\, working on lattice QCD i
 n background electromagnetic fields. His current work concerns topology an
 d the restoration of chiral and $U(1)_A$ symmetry in strong magnetic field
 s. He obtained his PhD from Bielefeld University in 2025 under Gergely End
 rődi\, with a thesis on QCD topology\, axions and electromagnetic fields.
  During his PhD he established the magnetic-field dependence of the topolo
 gical susceptibility across the chiral crossover and provided the first la
 ttice determination of the axion–photon coupling.\n\nhttps://indico.ihep
 .ac.cn/event/30766/
LOCATION:S408
URL:https://indico.ihep.ac.cn/event/30766/
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