Electroexcitation of the P{sub 33}(1232), P{sub 11}(1440), D{sub 13}(1520), and S{sub 11}(1535) at Q{sup 2}=0.4 and 0.65 (GeV/c){sup 2}

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.015201· OSTI ID:20695900

Aznauryan, I G ^[1]; Burkert, V D; Egiyan, H ^[2]; Joo, K ^[3]; Minehart, R; Smith, L C ^[4]

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1. Yerevan Physics Institute, 375036 Yerevan (Armenia)
2. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
3. University of Connecticut, Storrs, Connecticut 06269 (United States)
4. University of Virginia, Charlottesville, Virginia 22901 (United States)

Using two approaches - dispersion relations and the isobar model - we have analyzed recent high precision CLAS data on cross sections of {pi}{sup 0}, {pi}{sup +}, and {eta} electroproduction on protons, and the longitudinally polarized electron beam asymmetry for p(e{sup {yields}},e{sup '}p){pi}{sup 0} and p(e{sup {yields}},e{sup '}n){pi}{sup +}. The contributions of the resonances P{sub 33}(1232), P{sub 11}(1440), D{sub 13}(1520), and S{sub 11}(1535) to {pi} electroproduction and of S{sub 11}(1535) to {eta} electroproduction are found. The results obtained using the two approaches are in good agreement. There is also good agreement between amplitudes of the {gamma}*N{yields}S{sub 11}(1535) transition found in {pi} and {eta} electroproduction. For the first time accurate results are obtained for the longitudinal amplitudes of the P{sub 11}(1440), D{sub 13}(1520), and S{sub 11}(1535) electroexcitations on protons. A strong longitudinal response is found for the Roper resonance, which rules out presentation of this resonance as a hybrid state.

• OSTI ID: 20695900
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 71, Issue 1; Other Information: DOI: 10.1103/PhysRevC.71.015201; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ASYMMETRY
CROSS SECTIONS
DISPERSION RELATIONS
ELECTRON BEAMS
ELECTROPRODUCTION
ETA MESONS
FOUR MOMENTUM TRANSFER
GEV RANGE
ISOBAR MODEL
MULTIPARTICLE SPECTROMETERS
N-1440 BARYONS
N-1520 BARYONS
N-1535 BARYONS
PARTICLE IDENTIFICATION
PIONS NEUTRAL
PIONS PLUS
POLARIZED BEAMS
PROTONS