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Measurement of the N $\rightarrow \Delta^+$(1232) Transition at High Momentum Transfer by $\pi^0$ Electroproduction

M. Ungaro P. Stoler I. Aznauryan V. D. Burkert K. Joo L. C. Smith G. Adams M. Amarian P. Ambrozewicz M. Anghinolfi G. Asryan G. Audit 1 H. Avakian H. Bagdasaryan J. P. Ball N.A. Baltzell S. Barrow V. Batourine M. Battaglieri I. Bedliski M. Bektasoglu M. Bellis N. Benmouna B. L. Berman A. S. Biselli B. E. Bonner S. Bouchigny 2 S. Boiarinov R. Bradford D. Branford W. J. Briscoe W. K. Brooks S. Bültmann C. Butuceanu J. R. Calarco S. L. Careccia D. S. Carman A. Cazes S. Chen P. L. Cole P. Coltharp D. Cords P. Corvisiero D. Crabb J. P. Cummings E. de Sanctis R. Devita P. V. Degtyarenko H. Denizli L. Dennis A. Deur K. V. Dharmawardane C. Djalali G. E. Dodge J. Donnelly D. Doughty M. Dugger S. Dytman O. P. Dzyubak H. Egiyan K. S. Egiyan L. Elouadrhiri P. Eugenio R. Fatemi G. Fedotov G. Feldman R. J. Feuerbach H. Funsten M. Garçon 1 G. Gavalian G. P. Gilfoyle K. L. Giovanetti F. X. Girod 1 J. Goetz C. I. O. Gordon R. W. Gothe K. A. Griffioen M. Guidal 2 M. Guillo N. Guler L. Guo V. Gyurjyan C. Hadjidakis 2 R. S. Hakobyan J. Hardie D. Heddle F. W. Hersman I. Hleiqawi M. Holtrop K. Hicks C. E. Hyde-Wright Y. Ilieva D. G. Ireland B. S. Ishkhanov M. M. Ito D. Jenkins H.S. Jo 2 H. G. Juengst J. D. Kellie M. Khandaker W. Kim A. Klein F. J. Klein A. V. Klimenko M. Kossov L. H. Kramer V. Kubarovsky J. Kuhn S. E. Kuhn J. Lachniet J. M. Laget J. Langheinrich D. Lawrence T. Lee Ji Li K. Livingston C. Marchand 1 N. Markov S. Mcaleer B. Mckinnon J. W. C. Mcnabb B. A. Mecking S. Mehrabyan J.J. Melone M. D. Mestayer C.A. Meyer K. Mikhailov R. Minehart M. Mirazita R. Miskimen V. Mokeev L. Morand 1 S.A. Morrow 1, 2 J. Mueller G. S. Mutchler J. Napolitano R. Nasseripour S. Niccolai 2 G. Niculescu I. Niculescu B. B. Niczyporuk M. Niroula R. A. Niyazov M. Nozar G. V. O'Rielly M. Osipenko A. I. Ostrovidov K. Park E. Pasyuk S.A. Philips N. Pivnyuk D. Pocanic O. Pogorelko E. Polli S. Pozdniakov B. M. Preedom J. W. Price Y. Prok D. Protopopescu L. M. Qin B. A. Raue G. Riccardi G. Ricco M. Ripani B. G. Ritchie F. Ronchetti G. Rosner P. Rossi P. D. Rubin F. Sabatié 1 C. Salgado J. P. Santoro V. Sapunenko R. A. Schumacher V. S. Serov Y. G. Sharabian A. V. Skabelin E. S. Smith D. I. Sober A. Stavinsky S.S. Stepanyan S. Stepanyan B. E. Stokes I. I. Strakovsky S. Strauch M. Taiuti D. J. Tedeschi U. Thoma A. Tkabladze L. Todor S. Tkachenko C. Tur M. F. Vineyard A. V. Vlassov L. B. Weinstein D. P. Weygand M. Williams E. Wolin M. H. 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.
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Submitted on : Monday, October 16, 2006 - 10:46:01 AM
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M. Ungaro, P. Stoler, I. Aznauryan, V. D. Burkert, K. Joo, et al.. Measurement of the N $\rightarrow \Delta^+$(1232) Transition at High Momentum Transfer by $\pi^0$ Electroproduction. Physical Review Letters, American Physical Society, 2006, 97, pp.112003. ⟨10.1103/PhysRevLett.97.112003⟩. ⟨in2p3-00106729⟩

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