Measurement of the Helicity Difference in γ→p→→pπ+π- with the CLAS Spectrometer at Jefferson Laboratory
- Florida State Univ., Tallahassee, FL (United States)
The study of the properties of baryon resonances can provide us with hints to help us understand the structure of non-perturbative QCD and the effect of a particular resonance on polarization observables. The investigation of double-pion photoproduction data is needed to discover higher-lying states and their properties at and above W [approximate] 1.8 GeV. Therefore, the analysis of the helicity difference in gp γp→pπ+π- will help us in our understanding of QCD.The CLAS g9a (FROST) experiment, as part of the N* spectroscopy program at Jefferson Laboratory, has accumulated photoproduction data using linearly and circularly polarized photons incident on a longitudinally-polarized butanol target in the photon energy range 0.3 to 2.4 GeV. The FROST experiment provides an important step toward a “complete” experiment for the reaction gammaN-->KY.In this contribution, the method to calculate the helicity difference for the reaction γp→pπ+π- will be described and preliminary results will be discussed.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 990611
- Report Number(s):
- JLAB-PHY-09-1117; DOE/OR/23177-1347; TRN: US1007351
- Journal Information:
- AIP Conf. Proc., Vol. 1257, Issue 1-2; Conference: Hadron 2009, 29 Nov - 4 Dec 2009, Tallahassee, Florida
- Country of Publication:
- United States
- Language:
- English
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