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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
E102M201 AsymLT e p η p 0.6 1.0 1.77 1.79
E102M202 AsymLT e p η p 0.6 1.0 1.79 1.81
E102M203 AsymLT e p η p 1.0 1.4 1.49 1.51
E102M204 AsymLT e p η p 1.0 1.4 1.51 1.53
E102M205 AsymLT e p η p 1.0 1.4 1.53 1.55
E102M206 AsymLT e p η p 1.0 1.4 1.55 1.57
E102M207 AsymLT e p η p 1.0 1.4 1.57 1.59
E102M208 AsymLT e p η p 1.0 1.4 1.59 1.61
E102M209 AsymLT e p η p 1.0 1.4 1.61 1.63
E102M210 AsymLT e p η p 1.0 1.4 1.63 1.65
E102M211 AsymLT e p η p 1.0 1.4 1.65 1.67
E102M212 AsymLT e p η p 1.0 1.4 1.65 1.69
E102M213 AsymLT e p η p 1.0 1.4 1.67 1.71
E102M214 AsymLT e p η p 1.0 1.4 1.69 1.73
E102M215 AsymLT e p η p 1.0 1.4 1.71 1.75
E102M216 AsymLT e p η p 1.3 2.1 1.49 1.51
E102M217 AsymLT e p η p 1.3 2.1 1.51 1.53
E102M218 AsymLT e p η p 1.3 2.1 1.53 1.55
E102M219 AsymLT e p η p 1.3 2.1 1.55 1.57
E102M220 AsymLT e p η p 1.3 2.1 1.57 1.59
E102M221 AsymLT e p η p 1.3 2.1 1.59 1.61
E102M222 AsymLT e p η p 1.3 2.1 1.61 1.63
E102M223 AsymLT e p η p 1.3 2.1 1.63 1.65
E102M224 AsymLT e p η p 1.3 2.1 1.65 1.67
E102M225 AsymLT e p η p 1.3 2.1 1.67 1.69
E102M226 AsymLT e p η p 1.3 2.1 1.69 1.71
E102M227 AsymLT e p η p 1.3 2.1 1.71 1.73
E102M228 AsymLT e p η p 1.3 2.1 1.73 1.75
E102M229 AsymLT e p η p 1.3 2.1 1.75 1.77
E102M230 AsymLT e p η p 1.3 2.1 1.77 1.79
E102M231 AsymLT e p η p 1.3 2.1 1.79 1.81
E102M232 AsymLT e p η p 1.3 2.1 1.81 1.83
E102M233 AsymLT e p η p 1.3 2.1 1.83 1.85
E102M234 AsymLT e p η p 1.3 2.1 1.85 1.87
E102M235 AsymLT e p η p 1.3 2.1 1.87 1.89
E102M236 AsymLT e p η p 1.3 2.1 1.89 1.91
E102M237 AsymLT e p η p 1.3 2.1 1.91 1.93
E102M238 AsymLT e p η p 1.3 2.1 1.93 1.95
E102M239 AsymLT e p η p 1.3 2.1 1.95 1.97
E102M240 AsymLT e p η p 1.3 2.1 1.97 1.99
E102M241 AsymLT e p η p 1.3 2.1 1.99 2.01
E102M242 AsymLT e p η p 2.1 2.9 1.49 1.51
E102M243 AsymLT e p η p 2.1 2.9 1.51 1.53
E102M244 AsymLT e p η p 2.1 2.9 1.53 1.55
E102M245 AsymLT e p η p 2.1 2.9 1.55 1.57
E102M246 AsymLT e p η p 2.1 2.9 1.57 1.59
E102M247 AsymLT e p η p 2.1 2.9 1.59 1.61
E102M248 AsymLT e p η p 2.1 2.9 1.61 1.63
E102M249 AsymLT e p η p 2.1 2.9 1.63 1.65
E102M250 AsymLT e p η p 2.1 2.9 1.65 1.67
E102M251 AsymLT e p η p 2.1 2.9 1.65 1.69
E102M252 AsymLT e p η p 2.1 2.9 1.67 1.71
E102M253 AsymLT e p η p 2.1 2.9 1.69 1.73
E102M254 AsymLT e p η p 2.1 2.9 1.71 1.75
E102M255 AsymLT e p η p 2.1 2.9 1.73 1.77
E102M256 AsymLT e p η p 2.1 2.9 1.75 1.79
E102M257 AsymLT e p η p 2.1 2.9 1.77 1.81
E102M258 AsymLT e p η p 2.1 2.9 1.79 1.83
E102M259 AsymLT e p η p 2.1 2.9 1.81 1.85
E102M260 AsymLT e p η p 2.1 2.9 1.83 1.87
E102M261 AsymLT e p η p 2.1 2.9 1.85 1.89
E102M262 AsymLT e p η p 2.1 2.9 1.87 1.91
E102M263 AsymLT e p η p 2.1 2.9 1.89 1.93
E102M264 AsymTT e p η p 0.2 0.4 1.49 1.51
E102M265 AsymTT e p η p 0.2 0.4 1.51 1.53
E102M266 AsymTT e p η p 0.2 0.4 1.53 1.55
E102M267 AsymTT e p η p 0.2 0.4 1.55 1.57
E102M268 AsymTT e p η p 0.2 0.4 1.57 1.59
E102M269 AsymTT e p η p 0.2 0.4 1.59 1.61
E102M270 AsymTT e p η p 0.6 1.0 1.49 1.51
E102M271 AsymTT e p η p 0.6 1.0 1.51 1.53
E102M272 AsymTT e p η p 0.6 1.0 1.53 1.55
E102M273 AsymTT e p η p 0.6 1.0 1.55 1.57
E102M274 AsymTT e p η p 0.6 1.0 1.57 1.59
E102M275 AsymTT e p η p 0.6 1.0 1.59 1.61
E102M276 AsymTT e p η p 0.6 1.0 1.61 1.63
E102M277 AsymTT e p η p 0.6 1.0 1.63 1.65
E102M278 AsymTT e p η p 0.6 1.0 1.65 1.67
E102M279 AsymTT e p η p 0.6 1.0 1.67 1.69
E102M280 AsymTT e p η p 0.6 1.0 1.69 1.71
E102M281 AsymTT e p η p 0.6 1.0 1.71 1.73
E102M282 AsymTT e p η p 0.6 1.0 1.73 1.75
E102M283 AsymTT e p η p 0.6 1.0 1.75 1.77
E102M284 AsymTT e p η p 0.6 1.0 1.77 1.79
E102M285 AsymTT e p η p 0.6 1.0 1.79 1.81
E102M286 AsymTT e p η p 1.0 1.4 1.49 1.51
E102M287 AsymTT e p η p 1.0 1.4 1.51 1.53
E102M288 AsymTT e p η p 1.0 1.4 1.53 1.55
E102M289 AsymTT e p η p 1.0 1.4 1.55 1.57
E102M290 AsymTT e p η p 1.0 1.4 1.57 1.59
E102M291 AsymTT e p η p 1.0 1.4 1.59 1.61
E102M292 AsymTT e p η p 1.0 1.4 1.61 1.63
E102M293 AsymTT e p η p 1.0 1.4 1.63 1.65
E102M294 AsymTT e p η p 1.0 1.4 1.65 1.67
E102M295 AsymTT e p η p 1.0 1.4 1.65 1.69
E102M296 AsymTT e p η p 1.0 1.4 1.67 1.71
E102M297 AsymTT e p η p 1.0 1.4 1.69 1.73
E102M298 AsymTT e p η p 1.0 1.4 1.71 1.75
E102M299 AsymTT e p η p 1.3 2.1 1.49 1.51
E102M300 AsymTT e p η p 1.3 2.1 1.51 1.53
Created in SINP MSU, CLAS Collaboration