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Measurement of the Polarized Structure Function $\sigma_{LT^\prime}$ for $p(\vec{e},e'\pi^+)n$ in the $\Delta(1232)$ Resonance Region

K. Joo L. C. Smith I. G. Aznauryan V. D. Burkert R. Minehart G. Adams P. Ambrozewicz E. Anciant M. Anghinolfi B. Asavapibhop G. Asryan G. Audit T. Auger H. Avakian H. Bagdasaryan J. P. Ball S. Barrow V. Batourine M. Battaglieri K. Beard M. Bektasoglu N. Benmouna N. Bianchi A. S. Biselli S. Boiarinov B. E. Bonner S. Bouchigny 1 R. Bradford D. Branford W. J. Briscoe W. K. Brooks S. Bültmann C. Butuceanu J. R. Calarco D. S. Carman B. Carnahan C. Cetina S. Chen L. Ciciani P. L. Cole D. Cords P. Corvisiero D. Crabb H. Crannell J. P. Cummings E. de Sanctis R. Devita P. V. Degtyarenko L. Dennis A. Deur K. V. Dharmawardane K. S. Dhuga C. Djalali G. E. Dodge D. Doughty P. Dragovitsch M. Dugger S. Dytman O. P. Dzyubak H. Egiyan K. S. Egiyan L. Elouadrhiri A. Empl P. Eugenio R. Fersch R. J. Feuerbach T.A. Forest H. Funsten S. J. Gaff M. Garçon G. Gavalian S. Gilad G. P. Gilfoyle K. L. Giovanetti R. W. Gothe K. A. Griffioen M. Guidal 1 M. Guillo N. Guler L. Guo V. Gyurjyan C. Hadjidakis 1 R. S. Hakobyan J. Hardie D. Heddle F. W. Hersman K. Hicks I. Hleiqawi M. Holtrop J. Hu C. E. Hyde-Wright Y. Ilieva D. Ireland M. M. Ito D. Jenkins H. G. Juengst J. D. Kellie J. H. Kelley M. Khandaker K. Y. Kim K. Kim W. Kim A. Klein F. J. Klein A. V. Klimenko M. Klusman M. Kossov V. Koubarovski L. H. Kramer S. E. Kuhn J. Kuhn J. Lachniet J. M. Laget J. Langheinrich D. Lawrence T. Lee K. Livingston K. Lukashin J.J. Manak C. Marchand S. Mcaleer J. W. C. Mcnabb B. A. Mecking M. D. Mestayer C.A. Meyer K. Mikhailov M. Mirazita R. Miskimen V. Mokeev L. Morand S.A. Morrow V. Muccifora J. Mueller G. S. Mutchler J. Napolitano R. Nasseripour S. O. Nelson S. Niccolai G. Niculescu I. Niculescu B. B. Niczyporuk R. A. Niyazov M. Nozar G. V. O'Rielly M. Osipenko A. I. Ostrovidov K. Park E. Pasyuk G. Peterson 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 D. Rowntree P. D. Rubin F. Sabatié K. Sabourov C. Salgado J. P. Santoro V. Sapunenko R. A. Schumacher V. S. Serov Y. G. Sharabian J. Shaw S. Simionatto A. V. Skabelin E. S. Smith D. I. Sober M. Spraker A. Stavinsky S. Stepanyan S.S. Stepanyan B. E. Stokes P. Stoler I. I. Strakovsky S. Strauch M. Taiuti S. Taylor D. J. Tedeschi U. Thoma R. Thompson A. Tkabladze L. Todor C. Tur M. Ungaro M. F. Vineyard A. V. Vlassov K. Wang L. B. Weinstein H. Weller D. P. Weygand M. Williams E. Wolin M. H. Wood A. Yegneswaran J. Yun L. Zana
Abstract : The polarized longitudinal-transverse structure function sigmaLT[prime] has been measured using the p(e-vector,e[prime]pi+)n reaction in the Delta(1232) resonance region at Q2 = 0.40 and 0.65 GeV2. No previous sigmaLT[prime] data exist for this reaction channel. The kinematically complete experiment was performed at the Jefferson Lab with the CEBAF large acceptance spectrometer using longitudinally polarized electrons at an energy of 1.515 GeV. A partial-wave analysis of the data shows generally better agreement with recent phenomenological models of pion electroproduction compared to the previously measured pi0p channel. A fit to both pi0p and pi+n channels using a unitary isobar model suggests the unitarized Born terms provide a consistent description of the nonresonant background. The t-channel pion pole term is important in the pi0p channel through a rescattering correction, which could be model dependent.
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Submitted on : Tuesday, January 11, 2005 - 5:03:02 PM
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K. Joo, L. C. Smith, I. G. Aznauryan, V. D. Burkert, R. Minehart, et al.. Measurement of the Polarized Structure Function $\sigma_{LT^\prime}$ for $p(\vec{e},e'\pi^+)n$ in the $\Delta(1232)$ Resonance Region. Physical Review C, American Physical Society, 2004, 70, pp.042201-1 042201-6. ⟨10.1103/PhysRevC.70.042201⟩. ⟨in2p3-00023559⟩

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