Electroproduction of the {Delta}(1232) Resonance at High Momentum Transfer

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.82.45· OSTI ID:292726

Frolov, V V; Adams, G S; Davidson, R M; Klusman, M; Mukhopadhyay, N C; Napolitano, J; Nozar, M; Price, J W; Stoler, P; Witkowski, M ^[1]; Bosted, P ^[2]; Armstrong, C S; Meekins, D ^[3]; Assamagan, K; Avery, S; Baker, O K; Eden, T; Gaskell, D; Gueye, P; Hinton, W ; Keppel, C; Madey, R; Niculescu, G; Niculescu, I; Tang, L ^[4]; Ahmidouch, A; Madey, R ^[5]; Kim, W ^[6]; Baker, O K; Burkert, V; Carlini, R; Dunne, J; Ent, R; Keppel, C; Mack, D; Mitchell, J; Tang, L; Wood, S ^[7]; Koltenuk, D ^[8]; Minehart, R ^[9]; Mkrtchyan, H; Tadevosian, V ^[10]

---

1. Physics Department, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
2. Physics Department, American University, Washington, D.C. 20016 (United States)
3. Department of Physics, College of William Mary, Williamsburg, Virginia 23187 (United States)
4. Physics Department, Hampton University, Hampton, Virginia 23668 (United States)
5. Physics Department, Kent State University, Kent, Ohio 44242 (United States)
6. Physics Department, Kyungpook National University, Taegu, South (Korea)
7. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
8. Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)
9. Physics Department, University of Virginia, Charlottesville, Virginia 22903 (United States)
10. Yerevan Physics Institute, Yerevan (Armenia)

We studied the electroproduction of the {Delta}(1232) resonance via the reaction p(e,thinspe{sup {prime}}p){pi}{sup 0} at four-momentum transfers Q{sup 2}=2.8 and 4.0 GeV{sup 2} . This is the highest Q{sup 2} for which exclusive resonance electroproduction has ever been observed. Decay angular distributions for {Delta}{r_arrow}p{pi}{sup 0} were measured over a wide range of barycentric energies covering the resonance. The N{endash}{Delta} transition form factor G{sup {asterisk}}{sub M} and ratios of resonant multipoles E{sub 1+}/M{sub 1+} and S{sub 1+}/M{sub 1+} were extracted from the decay angular distributions. These ratios remain small, indicating that perturbative QCD is not applicable for this reaction at these momentum transfers. {copyright} {ital 1998} {ital The American Physical Society }

• OSTI ID: 292726
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DELTA BARYONS
DELTA-1232 BARYONS
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
LINEAR MOMENTUM
MOMENTUM TRANSFER
PIONS NEUTRAL
QUANTUM CHROMODYNAMICS
RESONANCE PARTICLES