A new method to amplify the photon-axion conversions in magnetic field is proposed using a buffer gas at a specific pressure. As a first result, new bounds for mass and coupling constant for purely laboratory experiments aiming to detect any hypothetical scalars and pseudo-scalars which can couple to photons were obtained at 95% confidence level, excluding the PVLAS result newly disclaimed.
@article{arxiv.0712.3362,
title = {First results from the OSQAR photon regeneration experiment: No light shining through a wall},
author = {OSQAR Collaboration and Pierre Pugnat and Lionel Duvillaret and Remy Jost and Guy Vitrant and Daniele Romanini and Andrzej Siemko and Rafik Ballou and Bernard Barbara and Michael Finger and Miroslav Finger and Jan Hosek and Miroslav Kral and Krzysztof A. Meissner and Miroslav Sulc and Josef Zicha},
journal= {arXiv preprint arXiv:0712.3362},
year = {2008}
}