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001     826211
005     20240610121046.0
024 7 _ |a 10.1103/PhysRevD.94.116021
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100 1 _ |a Dai, Lingyun
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245 _ _ |a Pion polarizabilities from a γ γ → π π analysis
260 _ _ |a Woodbury, NY
|c 2016
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520 _ _ |a We 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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542 _ _ |i 2016-12-30
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542 _ _ |i 2017-12-30
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700 1 _ |a Pennington, M. R.
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773 1 8 |a 10.1103/physrevd.94.116021
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773 _ _ |a 10.1103/PhysRevD.94.116021
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