Electroproduction of {eta} mesons in the S{sub 11}(1535) resonance region at high momentum transfer

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.015205· OSTI ID:21290014

Dalton, M M ^[1]; Adams, G S; Moziak, B; Stoler, P; Villano, A ^[2]; Ahmidouch, A; Danagoulian, S ^[3]; Angelescu, T; Malace, S ^[4]; Arrington, J; Hafidi, K; Holt, R J; Reimer, P E; Schulte, E; Zheng, X ^[5]; Asaturyan, R; Mkrtchyan, H; Navasardyan, T; Tadevosyan, V ^[6]; Baker, O K ^[7]

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1. University of the Witwatersrand, Johannesburg (South Africa)
2. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
3. North Carolina A and T State University, Greensboro, North Carolina 27411 (United States)
4. Bucharest University, Bucharest (Romania)
5. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
6. Yerevan Physics Institute, Yerevan (Armenia)
7. Hampton University, Hampton, Virginia 23668 (United States)

The differential cross section for the process p(e,e{sup '}p){eta} has been measured at Q{sup 2}{approx}5.7 and 7.0(GeV/c){sup 2} for center-of-mass energies from threshold to 1.8 GeV, encompassing the S{sub 11}(1535) resonance, which dominates the channel. This is the highest momentum-transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A{sub 1/2}, for the production of the S{sub 11}(1535) resonance, is extracted from the data. Within the limited Q{sup 2} now measured, this quantity appears to begin scaling as Q{sup -3}--a predicted, but not definitive, signal of the dominance of perturbative QCD at Q{sup 2}{approx}5 (GeV/c){sup 2}.

• OSTI ID: 21290014
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 1; Other Information: DOI: 10.1103/PhysRevC.80.015205; (c) 2009 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
CENTER-OF-MASS SYSTEM
DIFFERENTIAL CROSS SECTIONS
ELECTROPRODUCTION
ETA MESONS
GEV RANGE 01-10
HELICITY
MOMENTUM TRANSFER
PARTICLE DECAY
QUANTUM CHROMODYNAMICS
RESONANCE
TRANSITION AMPLITUDES