Article
Measurement of the N ->Delta (+)(1232) transition at high-momentum transfer by pi(0) electroproduction
Physical Review Letters
(2006)
- M Ungaro
- P Stoler
- I Aznauryan
- VD Burkert
- K Joo
- LC Smith
- G Adams
- M Amarian
- P Ambrozewicz
- M Anghinolfi
- G Asryan
- G Audit
- H Avakian
- H Bagdasaryan
- JP Ball
- NA Baltzell
- S Barrow
- V Batourine
- M Battaglieri
- I Bedliski
- M Bektasoglu
- M Bellis
- N Benmouna
- BL Berman
- AS Biselli
- BE Bonner
- S Bouchigny
- S Boiarinov
- R Bradford
- D Branford
- WJ Briscoe
- WK Brooks
- S Bultmann
- C Butuceanu
- JR Calarco
- SL Careccia
- DS Carman
- A Cazes
- S Chen
- PL Cole
- P Coltharp
- D Cords
- P Corvisiero
- D Crabb
- JP Cummings
- E Sanctis
- R DeVita
- PV Degtyarenko
- H Denizli
- L Dennis
- A Deur
- KV Dharmawardane
- C Djalali
- GE Dodge
- J Donnelly
- D Doughty
- M Dugger
- S Dytman
- OP Dzyubak
- H Egiyan
- KS Egiyan
- L Elouadrhiri
- P Eugenio
- R Fatemi
- G Fedotov
- G Feldman
- RJ Feuerbach
- H Funsten
- M Garcon
- G Gavalian
- GP Gilfoyle
- KL Giovanetti
- FX Girod
- J Goetz
- CIO Gordon
- RW Gothe
- KA Griffioen
- M Guidal
- M Guillo
- N Guler
- L Guo
- V Gyurjyan
- C Hadjidakis
- RS Hakobyan
- J Hardie
- D Heddle
- FW Hersman
- I Hleiqawi
- M Holtrop
- K Hicks
- CE Hyde-Wright
- Y Ilieva
- DG Ireland
- BS Ishkhanov
- MM Ito
- D Jenkins
- HS Jo
- HG Juengst
- JD Kellie
- M Khandaker
- W Kim
- A Klein
- FJ Klein
- AV Klimenko
- M Kossov
- LH Kramer
- V Kubarovsky
- J Kuhn
- SE Kuhn
- J Lachniet
- JM Laget
- J Langheinrich
- D Lawrence
- T Lee
- J Li
- K Livingston
- C Marchand
- N Markov
- S McAleer
- B McKinnon
- JWC McNabb
- BA Mecking
- S Mehrabyan
- JJ Melone
- MD Mestayer
- CA Meyer
- K Mikhailov
- R Minehart
- M Mirazita
- R Miskimen
- V Mokeev
- L Morand
- SA Morrow
- J Mueller
- GS Mutchler
- J Napolitano
- R Nasseripour
- S Niccolai
- G Niculescu
- I Niculescu
- BB Niczyporuk
- M Niroula
- RA Niyazov
- M Nozar
- GV O'Rielly
- M Osipenko
- AI Ostrovidov
- K Park
- E Pasyuk
- SA Philips
- N Pivnyuk
- D Pocanic
- O Pogorelko
- E Polli
- S Pozdniakov
- BM Preedom
- JW Price
- Y Prok
- D Protopopescu
- LM Qin
- BA Raue
- G Riccardi
- G Ricco
- M Ripani
- BG Ritchie
- F Ronchetti
- G Rosner
- P Rossi
- PD Rubin
- F Sabatie
- C Salgado
- JP Santoro
- V Sapunenko
- RA Schumacher
- VS Serov
- YG Sharabian
- AV Skabelin
- ES Smith
- DI Sober
- A Stavinsky
- SS Stepanyan
- S Stepanyan
- BE Stokes
- II Strakovsky
- S Strauch
- M Taiuti
- DJ Tedeschi
- U Thoma
- A Tkabladze
- L Todor
- S Tkachenko
- C Tur
- MF Vineyard
- AV Vlassov
- LB Weinstein
- DP Weygand
- M Williams, University of Massachusetts - Amherst
- E Wolin
- MH Wood
- A Yegneswaran
- L Zana
- B Zhang
- J Zhang
- B Zhao
Abstract
We report a new measurement of the exclusive electroproduction reaction gamma* p -> pi0 p to explore the evolution from soft non-perturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+) and scalar (S1+) multipoles in the N to Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 eV/c2, 4pi center-of-mass solid angle, and Q2 from 3 to 6 GeV2/c2, the highest yet achieved. It is found that the magnetic form factor G*M decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating strong helicity non-conservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.
Disciplines
Publication Date
January 1, 2006
Publisher Statement
Doi: 10.1103/PhysRevLett.97.112003
Copyright 2006 by The American Physical Society.
http://prl.aps.org/pdf/PRL/v97/i11/e112003
Citation Information
M Ungaro, P Stoler, I Aznauryan, VD Burkert, et al.. "Measurement of the N ->Delta (+)(1232) transition at high-momentum transfer by pi(0) electroproduction" Physical Review Letters Vol. 97 Iss. 11 (2006) Available at: http://works.bepress.com/michael_williams/50/