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Title: Measuring the charged pion polarizability in the gamma gamma -> pi+pi- reaction

Development has begun of a new experiment to measure the charged pion polarizability $$\alpha_{\pi}-\beta_{\pi}$$. The charged pion polarizability ranks among the most important tests of low-energy QCD presently unresolved by experiment. Analogous to precision measurements of $$\pi^{\circ}\rightarrow\gamma\gamma$$ that test the intrinsic odd-parity (anomalous) sector of QCD, the pion polarizability tests the intrinsic even-parity sector of QCD. The measurement will be performed using the $$\gamma\gamma\rightarrow\pi^{+{}}\pi^{-{}}$$ cross section accessed via the Primakoff mechanism on nuclear targets using the GlueX detector in Hall D at Jefferson Lab. The linearly polarized photon source in Hall-D will be utilized to separate the Primakoff cross-section from coherent $$\rho^{\circ}$$ production.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. JLAB
  2. University of Massachusetts, Amherst
Publication Date:
OSTI Identifier:
1090844
Report Number(s):
JLAB-PHY-13-1743; DOE/OR/23177-2573
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: CD12, August 6 -10, 2012, Jefferson Lab, Newport News, Virginia, USA
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS