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

Abstract

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.

Authors:
; ; ; ;  [1]; ; ; ; ; ; ; ; ; ; ; ;  [2];  [3];  [4];  [5]
  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)
Publication Date:
OSTI Identifier:
21293868
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 80; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.80.035203; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Villano, A N, Stoler, P, Kubarovsky, V, Adams, G S, Napolitano, J, 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, Connell, S H, Dalton, M M, and Ahmidouch, A. Neutral pion electroproduction in the resonance region at high Q{sup 2}. United States: N. p., 2009. Web. doi:10.1103/PHYSREVC.80.035203.
Villano, A N, Stoler, P, Kubarovsky, V, Adams, G S, Napolitano, J, 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, Connell, S H, Dalton, M M, & Ahmidouch, A. Neutral pion electroproduction in the resonance region at high Q{sup 2}. United States. https://doi.org/10.1103/PHYSREVC.80.035203
Villano, A N, Stoler, P, Kubarovsky, V, Adams, G S, Napolitano, J, 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, Connell, S H, Dalton, M M, and Ahmidouch, A. 2009. "Neutral pion electroproduction in the resonance region at high Q{sup 2}". United States. https://doi.org/10.1103/PHYSREVC.80.035203.
@article{osti_21293868,
title = {Neutral pion electroproduction in the resonance region at high Q{sup 2}},
author = {Villano, A N and Stoler, P and Kubarovsky, V and Adams, G S and Napolitano, J and Bosted, P E and Jones, M K and Ent, R and Fenker, H C and Gaskell, D and Lung, A and Mack, D and Meekins, D G and Roche, J and Smith, G R and Wojtsekhowski, B and Wood, S A and Connell, S H and Dalton, M M and Ahmidouch, A},
abstractNote = {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.},
doi = {10.1103/PHYSREVC.80.035203},
url = {https://www.osti.gov/biblio/21293868}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 80,
place = {United States},
year = {Tue Sep 15 00:00:00 EDT 2009},
month = {Tue Sep 15 00:00:00 EDT 2009}
}