First measurement of target and double spin asymmetries for e⃗p⃗→epπ0 in the nucleon resonance region above the Δ(1232) - Archive ouverte HAL Access content directly
Journal Articles Physical Review C Year : 2008

First measurement of target and double spin asymmetries for e⃗p⃗→epπ0 in the nucleon resonance region above the Δ(1232)

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Abstract

The exclusive channel p⃗(e⃗,e'p)π0 was studied in the first and second nucleon resonance regions in the Q2 range from 0.187 to 0.770 GeV2 at Jefferson Lab using the CEBAF Large Acceptance Spectrometer. Longitudinal target and beam-target asymmetries were extracted over a large range of center-of-mass angles of the π0 and compared to the unitary isobar model MAID, the dynamic model by Sato and Lee, and the dynamic model DMT. A strong sensitivity to individual models was observed, in particular for the target asymmetry and in the higher invariant mass region. This data set, once included in the global fits of the above models, is expected to place strong constraints on the electrocoupling amplitudes A1/2 and S1/2 for the Roper resonance N(1400)P11 and the N(1535)S11 and N(1520)D13 states.

Dates and versions

in2p3-00870385 , version 1 (07-10-2013)

Identifiers

Cite

A. S. Biselli, A. Fradi, M. Guidal, H. S. Jo, M. Maccormick, et al.. First measurement of target and double spin asymmetries for e⃗p⃗→epπ0 in the nucleon resonance region above the Δ(1232). Physical Review C, 2008, 78, pp.045204. ⟨10.1103/PhysRevC.78.045204⟩. ⟨in2p3-00870385⟩
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