New PVLAS results and limits on magnetically induced optical rotation and ellipticity in vacuum
By E. Zavattini, G. Zavattini, G. Ruoso, G. Raiteri, E. Polacco, E. Milotti, V. Lozza, M. Karuza, U. Gastaldi, G. Domenico and 5 more. 2007
217 citations recorded by the source corpus.
In 2006 the PVLAS collaboration reported the observation of an optical rotation generated in vacuum by a magnetic field. To further check against possible instrumental artifacts, several upgrades to the PVLAS apparatus have been made during the past year. Two data taking runs, at the wavelength of 1064 nm, have been performed in the new configuration with magnetic field strengths of 2.3 and 5 T. The 2.3 T field value was chosen in order to avoid stray fields. The new observations do not show the presence of a rotation signal down to the levels of $1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\text{ }\text{ }\mathrm{rad}$ at 5 T and $1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\text{ }\text{ }\mathrm{rad}$ at 2.3 T (at 95% C.L.) with 45 000 passes in the magnetic field zone. In the same conditions no ellipticity signal was detected down to $1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ at 2.3 T (at 95% C.L.), whereas at 5 T a signal is still present. The physical nature of this ellipticity as due to an effect depending on ${B}^{2}$ can be excluded by the measurement at 2.3 T. These new results completely exclude the previously published magnetically induced vacuum dichroism results, indicating that they were instrumental artifacts. These new results therefore also exclude the particle interpretation of the previous PVLAS results as due to a spin-zero boson. The background ellipticity at 2.3 T can be used to determine a new limit on the total photon-photon scattering cross section of ${\ensuremath{\sigma}}_{\ensuremath{\gamma}\ensuremath{\gamma}}l4.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}34}\text{ }\text{ }\mathrm{barn}$ at 95% C.L.
Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/3950fe955630ff3fc5cee78764f82c33a7b0a61b
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Citations in the corpus
- New experimental approaches in the search for axion-like particles (2018, background): “was a spurious effect of unknown systematics [453].”
- Any Light Particle Search II -- Technical Design Report (2013, methodology): “posals using LHC or Tevatron dipoles. Experiment Year of Magnetic length Magnetic field publication L[m] B[T] [Tm] BFRT [17] 1993 4.4 3.7 16.3 BMV [15] 2007 0.25 11 2.8 LIPPS [10] 2008 1 1.7 1.7 PVLAS [110] 2008 1 5 5 GammeV [11] 2008 3 5 15.0 ALPS-I [6] 2010 4.42 5.0 22.1 OSQAR [14] 2011 14.3 9 128.”
- The PVLAS experiment: A 25 year effort to measure vacuum magnetic birefringence (2020, methodology): “Assuming T = 106 s, in principle PVLAS-LNL could have reached a noise floor of Ψfloor ≈ 10−9 corresponding to ∆D ≈ 10−20 m a factor ≈ 80 above the QED effect considering a field intensity of Bext = 5.5 T.”