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E-89-039

Spokespersons
S. Dytman, K. Giovanetti
Year
2007
Abstract
New cross sections for the reaction ep to e eta p are reported for total center of mass energy W=1.5-2.3 GeV and invariant squared momentum transfer Q2=0.13-3.3 GeV2. This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta-N coupling strengths of baryon resonances. A sharp structure is seen at W ~ 1.7 GeV. The shape of the differential cross section is indicative of the presence of a P-wave resonance which persists to high Q2. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance. This is the first consistent interpretation over a large range of Q2.
Publication
  1. H. Denizli, J. Mueller, S. Dytman, M.L. Leber, R.D. Levine, J. Miles, K.Y. Kim, and CLAS Collaboration Q2 dependence of the S11(1535) Photocoupling and Evidence for a P-wave resonance in η electroproduction //
Quantities
σ   dσ/dΩ   dσ/dΩT+ε·dσ/dΩL   AsymLT   AsymTT

Measurements

ID Quantity Beam Target Final state Q2min,
GeV2 		Q2max,
GeV2 		Wmin,
GeV 		Wmax,
GeV
E102M101 dσ/dΩT+ε·dσ/dΩL e p η p 0.2 0.4 1.55 1.57
E102M102 dσ/dΩT+ε·dσ/dΩL e p η p 0.2 0.4 1.57 1.59
E102M103 dσ/dΩT+ε·dσ/dΩL e p η p 0.2 0.4 1.59 1.61
E102M104 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.49 1.51
E102M105 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.51 1.53
E102M106 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.53 1.55
E102M107 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.55 1.57
E102M108 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.57 1.59
E102M109 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.59 1.61
E102M110 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.61 1.63
E102M111 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.63 1.65
E102M112 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.65 1.67
E102M113 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.67 1.69
E102M114 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.69 1.71
E102M115 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.71 1.73
E102M116 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.73 1.75
E102M117 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.75 1.77
E102M118 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.77 1.79
E102M119 dσ/dΩT+ε·dσ/dΩL e p η p 0.6 1.0 1.79 1.81
E102M120 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.49 1.51
E102M121 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.51 1.53
E102M122 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.53 1.55
E102M123 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.55 1.57
E102M124 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.57 1.59
E102M125 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.59 1.61
E102M126 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.61 1.63
E102M127 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.63 1.65
E102M128 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.65 1.67
E102M129 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.65 1.69
E102M130 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.67 1.71
E102M131 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.69 1.73
E102M132 dσ/dΩT+ε·dσ/dΩL e p η p 1.0 1.4 1.71 1.75
E102M133 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.49 1.51
E102M134 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.51 1.53
E102M135 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.53 1.55
E102M136 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.55 1.57
E102M137 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.57 1.59
E102M138 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.59 1.61
E102M139 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.61 1.63
E102M140 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.63 1.65
E102M141 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.65 1.67
E102M142 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.67 1.69
E102M143 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.69 1.71
E102M144 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.71 1.73
E102M145 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.73 1.75
E102M146 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.75 1.77
E102M147 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.77 1.79
E102M148 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.79 1.81
E102M149 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.81 1.83
E102M150 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.83 1.85
E102M151 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.85 1.87
E102M152 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.87 1.89
E102M153 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.89 1.91
E102M154 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.91 1.93
E102M155 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.93 1.95
E102M156 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.95 1.97
E102M157 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.97 1.99
E102M158 dσ/dΩT+ε·dσ/dΩL e p η p 1.3 2.1 1.99 2.01
E102M159 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.49 1.51
E102M160 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.51 1.53
E102M161 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.53 1.55
E102M162 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.55 1.57
E102M163 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.57 1.59
E102M164 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.59 1.61
E102M165 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.61 1.63
E102M166 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.63 1.65
E102M167 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.65 1.67
E102M168 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.65 1.69
E102M169 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.67 1.71
E102M170 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.69 1.73
E102M171 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.71 1.75
E102M172 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.73 1.77
E102M173 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.75 1.79
E102M174 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.77 1.81
E102M175 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.79 1.83
E102M176 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.81 1.85
E102M177 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.83 1.87
E102M178 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.85 1.89
E102M179 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.87 1.91
E102M180 dσ/dΩT+ε·dσ/dΩL e p η p 2.1 2.9 1.89 1.93
E102M181 AsymLT e p η p 0.2 0.4 1.49 1.51
E102M182 AsymLT e p η p 0.2 0.4 1.51 1.53
E102M183 AsymLT e p η p 0.2 0.4 1.53 1.55
E102M184 AsymLT e p η p 0.2 0.4 1.55 1.57
E102M185 AsymLT e p η p 0.2 0.4 1.57 1.59
E102M186 AsymLT e p η p 0.2 0.4 1.59 1.61
E102M187 AsymLT e p η p 0.6 1.0 1.49 1.51
E102M188 AsymLT e p η p 0.6 1.0 1.51 1.53
E102M189 AsymLT e p η p 0.6 1.0 1.53 1.55
E102M190 AsymLT e p η p 0.6 1.0 1.55 1.57
E102M191 AsymLT e p η p 0.6 1.0 1.57 1.59
E102M192 AsymLT e p η p 0.6 1.0 1.59 1.61
E102M193 AsymLT e p η p 0.6 1.0 1.61 1.63
E102M194 AsymLT e p η p 0.6 1.0 1.63 1.65
E102M195 AsymLT e p η p 0.6 1.0 1.65 1.67
E102M196 AsymLT e p η p 0.6 1.0 1.67 1.69
E102M197 AsymLT e p η p 0.6 1.0 1.69 1.71
E102M198 AsymLT e p η p 0.6 1.0 1.71 1.73
E102M199 AsymLT e p η p 0.6 1.0 1.73 1.75
E102M200 AsymLT e p η p 0.6 1.0 1.75 1.77
Created in SINP MSU, CLAS Collaboration