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First measurement of the double spin asymmetry in (-->)e(-->)p-->e(prime)pi(+)n in the resonance region |
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| Authors: | De Vita R Anghinolfi M Burkert V D Dodge G E Minehart R Taiuti M Weller H Adams G Amaryan M J Anciant E Armstrong D S Asavapibhop B Asryan G Audit G Auger T Avakian H Bagdasaryan H Ball J P Barrow S Battaglieri M Beard K Bektasoglu M Bianchi N Biselli A S Boiarinov S Bonner B E Bosted P Bouchigny S Branford D Brooks W K Bueltmann S Calarco J R Capitani G P Carman D S Carnahan B Cazes A Ciciani L Cole P L Coleman A Connelly J Cords D Corvisiero P Crabb D Crannell H Cummings J P De Sanctis E Degtyarenko P V Demirchyan R Denizli H Dennis L Dharmawardane K V Dhuga K S Djalali C Doughty D |
| Institution: | Istituto Nazionale di Fisica Nucleare, Sezione di Genova, and Dipartimento di Fisica dell'Università, 16146 Genova, Italy. |
| Abstract: | 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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