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arXiv · 0805.3036

Limits on Low Energy Photon-Photon Scattering from an Experiment on Magnetic Vacuum Birefringence

M. Bregant·G. Cantatore·S. Carusotto·R. Cimino·F. Della Valle·G. Di Domenico·U. Gastaldi·M. Karuza·V. Lozza·E. Milotti·E. Polacco·G. Raiteri·G. Ruoso·E. Zavattini·G. Zavattini
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Abstract

Experimental bounds on induced vacuum magnetic birefringence can be used to improve present photon-photon scattering limits in the electronvolt energy range. Measurements with the PVLAS apparatus (E. Zavattini {\it et al.}, Phys. Rev. D {\bf77} (2008) 032006) at both $λ= 1064$ nm and 532 nm lead to bounds on the parameter {\it A$_{e}$}, describing non linear effects in QED, of $A_{e}^{(1064)} < 6.6\cdot10^{-21}$ T$^{-2}$ @ 1064 nm and $A_{e}^{(532)} < 6.3\cdot10^{-21}$ T$^{-2}$ @ 532 nm, respectively, at 95% confidence level, compared to the predicted value of $A_{e}=1.32\cdot10^{-24}$ T$^{-2}$. The total photon-photon scattering cross section may also be expressed in terms of $A_e$, setting bounds for unpolarized light of $σ_{γγ}^{(1064)} < 4.6\cdot10^{-62}$ m$^{2}$ and $σ_{γγ}^{(532)} < 2.7\cdot10^{-60}$ m$^{2}$. Compared to the expected QED scattering cross section these results are a factor of $\simeq2\cdot10^{7}$ higher and represent an improvement of a factor about 500 on previous bounds based on ellipticity measurements and of a factor of about $10^{10}$ on bounds based on direct stimulated scattering measurements.

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M. Bregant, G. Cantatore, S. Carusotto, R. Cimino, F. Della Valle, G. Di Domenico, U. Gastaldi, M. Karuza, V. Lozza, E. Milotti, E. Polacco, G. Raiteri, G. Ruoso, E. Zavattini, G. Zavattini. 2008-05-20. Limits on Low Energy Photon-Photon Scattering from an Experiment on Magnetic Vacuum Birefringence. https://doi.org/10.1103/physrevd.78.032006

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