[Clas_hadron] HSWG: a message from I.Zonta

[Marco Battaglieri]

Dear spectroscopysts,
here below a message from Irene Zonta. Please send your comments 
directly to Irene.
Cheers
Marco
/
//Dear All, //
//The following abstract has been submitted and approved by the NSTAR 
2015 Organization Committee. //
//I am preparing the slides which I will send for approval. //
//Sincerely //
//Irene Zonta //
//The text may be found below: //
//Constituent Quark Models and recent Lattice QCD calculations predict 
an excited baryon spectrum much richer than the one experimentally 
observed, the so-called missing resonances problem. These missing states 
may be revealed by partial wave analysis of not yet measured 
polarization observables. The CLAS g14/E06-101 (HDice) experiment is 
part of the N∗ spectroscopy program at Jefferson Laboratory: it has 
taken photoproduction data using both circularly- and linearly- 
polarized photons in the photon energy range up to 2.5 GeV impinging on 
a longitudinally-polarized Hydrogen-Deuteride (HD) frozen spin target, 
where both the proton and the neutron are polarized. We present results 
on the beam-helicity asymmetry I⊙, for the double charged pion 
photoproduction on both proton and neutron targets and the helicity 
difference P⊙z on the proton target. Preliminary results on the double 
polarization observable E for the photoproduction of the ρ vector meson 
on the proton will be also discussed. /

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