First measurement of the double spin asymmetry in (-->)e(-->)p-->e(prime)pi(+)n in the resonance region. R De Vita , M Anghinolfi , V D Burkert , G E Dodge , R Minehart , M Taiuti , H Weller , G Adams , M J Amaryan , E Anciant , D S Armstrong , B Asavapibhop , G Asryan , G Audit , T Auger , H Avakian , H Bagdasaryan , J P Ball , S Barrow , M Battaglieri , K Beard , M Bektasoglu , N Bianchi , A S Biselli , S Boiarinov , B E Bonner , P Bosted , S Bouchigny , D Branford , W K Brooks , S Bueltmann , J R Calarco , G P Capitani , D S Carman , B Carnahan , A Cazes , L Ciciani , P L Cole , A Coleman , J Connelly , D Cords , P Corvisiero , D Crabb , H Crannell , J P Cummings , E De Sanctis , P V Degtyarenko , R Demirchyan , H Denizli , L Dennis , K V Dharmawardane , K S Dhuga , C Djalali , D Doughty , P Dragovitsch , M Dugger , S Dytman , M Eckhause , H Egiyan , K S Egiyan , L Elouadrhiri , A Empl , L Farhi , R Fatemi , R J Feuerbach , J Ficenec , T A Forest , V Frolov , H Funsten , S J Gaff , M Gai , M Garçon , G Gavalian , S Gilad , G P Gilfoyle , K L Giovanetti , P Girard , E Golovatch , K Griffioen , M Guidal , M Guillo , V Gyurjyan , C Hadjidakis , D Hancock , J Hardie , D Heddle , P Heimberg , F W Hersman , K Hicks , R S Hicks , M Holtrop , J Hu , C E Hyde-Wright , B S Ishkanov , M M Ito , D Jenkins , K Joo , J H Kelley , J D Kellie , M Khandaker , K Y Kim , K Kim , W Kim , A Klein , F J Klein , M Klusman , M Kossov , L H Kramer , Y Kuang , S E Kuhn , J Lachniet , J M Laget , D Lawrence , Ji Li , K Livingston , A Longhi , K Loukachine , M Lucas , W Major , J J Manak , C Marchand , S McAleer , J McCarthy , J W C McNabb , B A Mecking , M D Mestayer , C A Meyer , K Mikhailov , M Mirazita , R Miskimen , V Mokeev , V Muccifora , J Mueller , G S Mutchler , J Napolitano , S O Nelson , G Niculescu , I Niculescu , B B Niczyporuk , R A Niyazov , A K Opper , G V O'Rielly , M Osipenko , 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 , A R Reolon , G Riccardi , G Ricco , M Ripani , B G Ritchie , S Rock , F Ronchetti , P Rossi , D Rowntree , P D Rubin , F Sabatié , K Sabourov , C Salgado , V Sapunenko , M Sargsyan , R A Schumacher , V S Serov , A Shafi , Y G Sharabian , J Shaw , A V Skabelin , E S Smith , T Smith , L C Smith , D I Sober , L Sorrell , M Spraker , A Stavinsky , S Stepanyan , P Stoler , I I Strakovsky , S Taylor , D J Tedeschi , R Thompson , L Todor , M Ungaro , M F Vineyard , A V Vlassov , K Wang , L B Weinstein , A Weisberg , D P Weygand , C S Whisnant , E Wolin , A Yegneswaran , J Yun , B Zhang , J Zhao , Z Zhou Physical review letters（2002）
摘要
The double spin asymmetry in the (-->)e(-->)p --> e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.
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