Electroproduction of the Delta(1232) resonance at high momentum transfer

Authors
Frolov, VV Adams, GS Ahmidouch, A Armstrong, CS Assamagan, K Avery, S Baker, OK Bosted, P Burkert, V Carlini, R Davidson, RM Dunne, J Eden, T Ent, R Gaskell, D Gueye, P Hinton, W Keppel, C Kim, W Klusman, M Koltenuk, D Mack, D Madey, R Meekins, D Minehart, R Mitchell, J Mkrtchyan, H Mukhopadhyay, NC Napolitano, J Niculescu, G Niculescu, I Nozar, M Price, JW Stoler, P Tadevosian, V Tang, L Witkowski, M Wood, S
Citation
Vv. Frolov et al., Electroproduction of the Delta(1232) resonance at high momentum transfer, PHYS REV L, 82(1), 1999, pp. 45-48
Citations number
30
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
1
Year of publication
1999
Pages
45 - 48
Database
ISI
SICI code
0031-9007(19990104)82:1<45:EOTDRA>2.0.ZU;2-L
Abstract
We studied the electroproduction of the Delta(1232) resonance via the react ion p(e,e'p) pi(0) at four-momentum transfers Q(2) = 2.8 and 4.0 GeV2. This is the highest Q(2) for which exclusive resonance electroproduction has ev er been observed. Decay angular distributions for Delta --> p pi(0) were me asured over a wide range of barycentric energies covering the resonance. Th e N-Delta transition form factor G(M)* and ratios of resonant multipoles E1 +/M1+ and S1+/M1+ were extracted from the decay angular distributions. Thes e ratios remain small, indicating that perturbative QCD is not applicable f or this reaction at these momentum transfers. [S0031-9007(98)08126-5].