[Photon]-[axion-like particle] regeneration experiment using a "light shining through a wall" technique

[Photon]-[dilaton-like chameleon particle] regeneration using a "particle trapped in a jar" technique

• Physics motivation for a milli-eV particle (links)
  • Energy frontier (Electroweak-Planck see-saw and string theory)
  • Neutrinos (Mass differences)
  • Astroparticle mysteries (Dark Matter and Dark Energy)
• Current experimental results (links)
  • Previous experiment BFRT (null result, but milli-eV not excluded)
  • PVLAS (anomalous result using polarization rotations and ellipticities, now maybe not?)
  • CAST (null result looking at the shining sun), BMV (null pseudoscalar result)
  • Theories exist that are consistent with PVLAS's anomalous and CAST's null results
• The GammeV Experiment (links)
  • Tevatron dipole magnet at 5T
  • Nd:YAG laser at 532nm, 5ns wide pulses, power 160mJ, rep rate 20Hz
  • PMT with single photon sensitivity, 40% QE, 5mm photocathode
  • Data acquisition system uses QuarkNet PMT timing boards
  • An analysis based upon time correlated single photon counting
  • The "wall" is a concave mirror mounted on a movable plunger
  • The "jar" is between our optical windows from which a chameleon afterglow can shine
  • Axion-like particle results PRL, preliminary results arXiv, see also our results page.
  • Chameleon results, PRL, preliminary results arXiv, see our chameleon page.