The target asymmetry P_z in {gamma}p-->p{pi}^+{pi}^- with the CLAS spectrometer at Jefferson Laboratory
The study of baryon resonances provides a deeper understanding of the strong interaction because the dynamics and relevant degrees of freedom hidden within them are reflected by the properties of the excited states of baryons. Higher-lying excited states at and above 1.9 GeV/c{sup 2} are generally predicted to have strong couplings to the {pi}{pi}N final states via {pi}{Delta} or {rho}N intermediate states. Double-pion photoproduction is therefore important to find and investigate properties of highmass resonances. The CLAS g9a (FROST) experiment, as part of the N* spectroscopy program at Jefferson Laboratory (JLab), 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. In this contribution, the extraction of the target asymmetry for the reaction {gamma}p {yields} p{pi}{sup +}{pi}{sup -} will be described and preliminary results will be presented.
- 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:
- 1038744
- Report Number(s):
- JLAB-PHY-11-1506; DOE/OR/23177-2073; TRN: US1201984
- Journal Information:
- AIP Conf. Proc., Vol. 1432; Conference: NSTAR 11, 17-20 May 2011, Newport News, VA
- Country of Publication:
- United States
- Language:
- English
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