Journal Article

FZJ-2017-00457

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pion polarizabilities from a γ γ → π π analysis

Dai, L. (Corresponding author)FZJ* ; Pennington, M. R.

2016
Inst. Woodbury, NY

This record in other databases:  

Please use a persistent id in citations: http://hdl.handle.net/2128/13612  doi:10.1103/PhysRevD.94.116021

Abstract: 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.

---

Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. 531 - Condensed Matter and Molecular Building Blocks (POF3-531) (POF3-531)

Appears in the scientific report 2016

---

Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---