[Clas_hadron] Abstract for contributed talk at Baryons 2016

[Steffen Strauch]

Dear Colleagues,

I like to submit an abstract for a contributed talk at the Baryons 2016 conference and report on our results for the polarization observable E in pi+ photoproduction from FROST.  Please see my draft abstract below and send me your comments or suggestions. I will submit the abstract later tomorrow afternoon.

Many thanks and all the best,
Steffen

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Polarization Observable $E$ in $\pi^+$-Photoproduction from FROST 

S.~Strauch, for the CLAS Collaboration

The spectrum of nucleon excitations is dominated by broad and overlapping resonances.  Polarization observables in photoproduction reactions are key in the study of these excitations.  They give indispensable constraints to partial-wave analyses and help clarify the spectrum.  Recent results from the longitudinally polarized frozen-spin target (FROST) program are reported.  The double-polarization observable $E$, for the reaction $\vec \gamma \vec p \to \pi^+n$, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37~GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility.  These polarization data agree fairly well with previous partial-wave analyses at low photon energies.  Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-$L$ multipoles contribute.  The data have been included in new multipole analyses from the Bonn-Gatchina, J\"ulich-Bonn, and SAID groups.

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