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Axion
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=== Polarized light in a magnetic field === The Italian [[PVLAS]] experiment searches for polarization changes of [[polarized light|light]] propagating in a magnetic field. The concept was first put forward in 1986 by [[Luciano Maiani]], Roberto Petronzio and [[Emilio Zavattini]].<ref> {{cite journal |last1=Maiani |first1=L. |author-link1=Luciano Maiani |last2=Petronzio |first2=R. |last3=Zavattini |first3=E. |author-link3=Emilio Zavattini |date=7 August 1986 |title=Effects of nearly massless, spin-zero particles on light propagation in a magnetic field |journal=Physics Letters B |volume=175 |issue=3 |pages=359β363 |doi=10.1016/0370-2693(86)90869-5 |bibcode=1986PhLB..175..359M |id=CERN-TH.4411/86 |url=http://cdsweb.cern.ch/record/167556/files/198606014.pdf }} </ref> A rotation claim<ref> {{cite magazine |first1=Steve |last1=Reucroft |first2=John |last2=Swain |date=2006-10-05 |title=Axion signature may be QED |magazine=CERN Courier |url=http://cerncourier.com/main/article/46/8/10 |archive-url=https://web.archive.org/web/20080820154706/http://cerncourier.com/main/article/46/8/10 |archive-date=2008-08-20 |df=dmy-all }} </ref> in 2006 was excluded by an upgraded setup.<ref name="zavattini_1"> {{cite journal |last1=Zavattini |first1=E. |collaboration=PVLAS Collaboration |display-authors=etal |year=2006 |title=Experimental Observation of Optical Rotation Generated in Vacuum by a Magnetic Field |journal=Physical Review Letters |volume=96 |issue=11 |page=110406 |doi=10.1103/PhysRevLett.96.110406 |pmid=16605804 |arxiv=hep-ex/0507107 |bibcode=2006PhRvL..96k0406Z }}</ref> An optimized search began in 2014.
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