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000826211 1001_ $$0P:(DE-Juel1)168586$$aDai, Lingyun$$b0$$eCorresponding author$$ufzj
000826211 245__ $$aPion polarizabilities from a γ γ → π π analysis
000826211 260__ $$aWoodbury, NY$$bInst.$$c2016
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000826211 520__ $$aWe present results for pion polarizabilities predicted using dispersion relations from our earlier amplitude analysis of world data on two photon production of meson pairs. The helicity-zero polarizabilities are rather stable and insensitive to uncertainties in cross-channel exchanges. The need is first to confirm the recent result on (α1−β1) for the charged pion by COMPASS at CERN to an accuracy of 10% by measuring the γγ→π+π− cross section to an uncertainty of 1%. Then the same polarizability, but for π0, is fixed to be (α1−β1)π0=(0.9±0.2)×10−4  fm3. By analyzing the correlation between uncertainties in the meson polarizability and those in γγ cross sections, we suggest experiments need to measure these cross sections between √s≃350 and 600 MeV. The π0π0 cross section then makes the (α2−β2)π0 the easiest helicity-two polarizability to determine.
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000826211 7001_ $$0P:(DE-HGF)0$$aPennington, M. R.$$b1
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