This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevD.94.116021 in citations.
Please use the identifier: http://hdl.handle.net/2128/13612 in citations.
Pion polarizabilities from a γ γ → π π analysis
Pion polarizabilities from a γ γ → π π analysis
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 f...
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Personal Name(s): | Dai, Lingyun (Corresponding author) |
---|---|
Pennington, M. R. | |
Contributing Institute: |
Theorie der Starken Wechselwirkung; IAS-4 Theorie der starken Wechselwirkung; IKP-3 |
Published in: | Physical Review D Physical review / D, 94 94 (2016 2016) 11 11, S. 116021 116021 |
Imprint: |
Woodbury, NY
Inst.
2016
2016-12-30 2016-12-01 |
DOI: |
10.1103/PhysRevD.94.116021 |
Document Type: |
Journal Article |
Research Program: |
Condensed Matter and Molecular Building Blocks Computational Science and Mathematical Methods |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/13612 in citations.
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. |