Neutral pion electroproduction in the resonance region at high Q{sup 2}

Journal Article · Tue Sep 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.035203· OSTI ID:21293868

Villano, A N; Stoler, P; Kubarovsky, V; Adams, G S; Napolitano, J ^[1]; Bosted, P E; Jones, M K; Ent, R; Fenker, H C; Gaskell, D; Lung, A; Mack, D; Meekins, D G; Roche, J; Smith, G R; Wojtsekhowski, B; Wood, S A ^[2]; Connell, S H ^[3]; Dalton, M M ^[4]; Ahmidouch, A ^[5]

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1. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
2. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
3. University of the Johannesburg, Johannesburg (South Africa)
4. University of the Witwatersrand, Johannesburg (South Africa)
5. North Carolina A and T State University, Greensboro, North Carolina 27411 (United States)

The process ep{yields}ep{pi}{sup 0} has been measured at Q{sup 2}=6.4 and 7.7 (GeV/c{sup 2}){sup 2} in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center-of-mass frame considering the process {gamma}*p{yields}p{pi}{sup 0}. Various details relating to the background subtractions, radiative corrections, and systematic errors are discussed. The usefulness of the data with regard to the measurement of the electromagnetic properties of the well-known {delta}(1232) resonance is covered in detail. Specifically considered are the electromagnetic and scalar-magnetic ratios R{sub EM} and R{sub SM} along with the magnetic transition form factor G{sub M}*. It is found that the rapid falloff of the {delta}(1232) contribution continues into this region of momentum transfer and that other resonances may be making important contributions in this region.

• OSTI ID: 21293868
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 3; Other Information: DOI: 10.1103/PhysRevC.80.035203; (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
CEBAF ACCELERATOR
CENTER-OF-MASS SYSTEM
DELTA-1232 BARYONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
ERRORS
FORM FACTORS
GEV RANGE
MOMENTUM TRANSFER
PHOTONS
PIONS NEUTRAL
PROTON-PROTON INTERACTIONS
PROTONS
RADIATIVE CORRECTIONS
RESONANCE
SCALARS