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@INPROCEEDINGS{Meyer:295201,
      author       = {Meyer, Manuel and Horns, Dieter},
      title        = {{I}ndications for a suppression of pair production at very
                      high energies},
      address      = {Hamburg},
      publisher    = {Deutsches Elektronen-Synchrotron, DESY},
      reportid     = {PUBDB-2016-01117, DESY-PROC-2011-04},
      pages        = {151-157},
      year         = {2011},
      abstract     = {The transparency of the universe for very high energy (VHE)
                      photons is limited due to pair-production with low energy
                      photons of the extra galactic background light (EBL) in the
                      ultra-violet to infrared wavelength band. Here, we use 58
                      energy spectra from VHE emitting active galactic nuclei
                      (AGN) from redshift 0.004 to 0.536 to search for signatures
                      of deviations from the minimum expected opacity. A
                      statistical study of the individual measurements reveals
                      indications for an overcorrection of AGN spectra with
                      current EBL models. Axion like particles are discussed as a
                      possible explanation of the result.},
      month         = {Jun},
      date          = {2011-06-27},
      organization  = {7th Patras Workshop on Axions, WIMPs
                       and WISPs, Mykonos (Greece), 27 Jun
                       2011 - 1 Jul 2011},
      cin          = {L},
      cid          = {I:(DE-H253)L-20120731},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-H253)HERA(machine)-20150101},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)15},
      doi          = {10.3204/DESY-PROC-2011-04/meyer_manuel},
      url          = {https://bib-pubdb1.desy.de/record/295201},
}