Vacuum magnetic linear birefringence using pulsed fields: the BMV experiment
Résumé
We present the measurement of the vacuum magnetic linear birefringence obtained using the first generation setup of the BMV experiment. Our apparatus is based on an up-to-date resonant optical cavity coupled to a transverse magnetic field. In particular, we detail our data acquisition and analysis procedure which takes into account the symmetry properties of the raw data with respect to the orientation of the magnetic field and the sign of the cavity birefringence. Our current value of vacuum magnetic linear birefringence $k_\mathrm{CM}$ was obtained with about 200 magnetic pulses and a maximum field of 6.5\,T. We get $k_\mathrm{CM} = (5.1 \pm 6.2) \times 10^{-21}$\,T$^{-2}$ at $3\sigma$ confidence level. This result is also used to extend the excluded region of axion-two photons coupling constant $g$ as a function of the axion mass $m_\mathrm{a}$. The best limit is obtained at $m_\mathrm{a} = 3.3$\,meV with $g<1.9\times 10^{-6}$\,GeV$^{-1}$ at $3\sigma$ confidence level.
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