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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
E102M1 dσ/dΩ e p η p 0.2 0.4 1.49 1.51
E102M2 dσ/dΩ e p η p 0.2 0.4 1.51 1.53
E102M3 dσ/dΩ e p η p 0.2 0.4 1.53 1.55
E102M4 dσ/dΩ e p η p 0.2 0.4 1.55 1.57
E102M5 dσ/dΩ e p η p 0.2 0.4 1.57 1.59
E102M6 dσ/dΩ e p η p 0.2 0.4 1.59 1.61
E102M7 dσ/dΩ e p η p 0.6 1.0 1.49 1.51
E102M8 dσ/dΩ e p η p 0.6 1.0 1.51 1.53
E102M9 dσ/dΩ e p η p 0.6 1.0 1.53 1.55
E102M10 dσ/dΩ e p η p 0.6 1.0 1.55 1.57
E102M11 dσ/dΩ e p η p 0.6 1.0 1.57 1.59
E102M12 dσ/dΩ e p η p 0.6 1.0 1.59 1.61
E102M13 dσ/dΩ e p η p 0.6 1.0 1.61 1.63
E102M14 dσ/dΩ e p η p 0.6 1.0 1.63 1.65
E102M15 dσ/dΩ e p η p 0.6 1.0 1.65 1.67
E102M16 dσ/dΩ e p η p 0.6 1.0 1.67 1.69
E102M17 dσ/dΩ e p η p 0.6 1.0 1.69 1.71
E102M18 dσ/dΩ e p η p 0.6 1.0 1.71 1.73
E102M19 dσ/dΩ e p η p 0.6 1.0 1.73 1.75
E102M20 dσ/dΩ e p η p 0.6 1.0 1.75 1.77
E102M21 dσ/dΩ e p η p 0.6 1.0 1.77 1.79
E102M22 dσ/dΩ e p η p 0.6 1.0 1.79 1.81
E102M23 dσ/dΩ e p η p 1.0 1.4 1.49 1.51
E102M24 dσ/dΩ e p η p 1.0 1.4 1.51 1.53
E102M25 dσ/dΩ e p η p 1.0 1.4 1.53 1.55
E102M26 dσ/dΩ e p η p 1.0 1.4 1.55 1.57
E102M27 dσ/dΩ e p η p 1.0 1.4 1.57 1.59
E102M28 dσ/dΩ e p η p 1.0 1.4 1.59 1.61
E102M29 dσ/dΩ e p η p 1.0 1.4 1.61 1.63
E102M30 dσ/dΩ e p η p 1.0 1.4 1.63 1.65
E102M31 dσ/dΩ e p η p 1.0 1.4 1.65 1.67
E102M32 dσ/dΩ e p η p 1.0 1.4 1.67 1.69
E102M33 dσ/dΩ e p η p 1.0 1.4 1.69 1.71
E102M34 dσ/dΩ e p η p 1.0 1.4 1.71 1.73
E102M35 dσ/dΩ e p η p 1.0 1.4 1.73 1.75
E102M36 dσ/dΩ e p η p 1.3 2.1 1.49 1.51
E102M37 dσ/dΩ e p η p 1.3 2.1 1.51 1.53
E102M38 dσ/dΩ e p η p 1.3 2.1 1.53 1.55
E102M39 dσ/dΩ e p η p 1.3 2.1 1.55 1.57
E102M40 dσ/dΩ e p η p 1.3 2.1 1.57 1.59
E102M41 dσ/dΩ e p η p 1.3 2.1 1.59 1.61
E102M42 dσ/dΩ e p η p 1.3 2.1 1.61 1.63
E102M43 dσ/dΩ e p η p 1.3 2.1 1.63 1.65
E102M44 dσ/dΩ e p η p 1.3 2.1 1.65 1.67
E102M45 dσ/dΩ e p η p 1.3 2.1 1.67 1.69
E102M46 dσ/dΩ e p η p 1.3 2.1 1.69 1.71
E102M47 dσ/dΩ e p η p 1.3 2.1 1.71 1.73
E102M48 dσ/dΩ e p η p 1.3 2.1 1.73 1.75
E102M49 dσ/dΩ e p η p 1.3 2.1 1.75 1.77
E102M50 dσ/dΩ e p η p 1.3 2.1 1.77 1.79
E102M51 dσ/dΩ e p η p 1.3 2.1 1.79 1.81
E102M52 dσ/dΩ e p η p 1.3 2.1 1.81 1.83
E102M53 dσ/dΩ e p η p 1.3 2.1 1.83 1.85
E102M54 dσ/dΩ e p η p 1.3 2.1 1.85 1.87
E102M55 dσ/dΩ e p η p 1.3 2.1 1.87 1.89
E102M56 dσ/dΩ e p η p 1.3 2.1 1.89 1.91
E102M57 dσ/dΩ e p η p 1.3 2.1 1.91 1.93
E102M58 dσ/dΩ e p η p 1.3 2.1 1.93 1.95
E102M59 dσ/dΩ e p η p 1.3 2.1 1.95 1.97
E102M60 dσ/dΩ e p η p 1.3 2.1 1.97 1.99
E102M61 dσ/dΩ e p η p 1.3 2.1 1.99 2.01
E102M62 dσ/dΩ e p η p 2.1 2.9 1.49 1.51
E102M63 dσ/dΩ e p η p 2.1 2.9 1.51 1.53
E102M64 dσ/dΩ e p η p 2.1 2.9 1.53 1.55
E102M65 dσ/dΩ e p η p 2.1 2.9 1.55 1.57
E102M66 dσ/dΩ e p η p 2.1 2.9 1.57 1.59
E102M67 dσ/dΩ e p η p 2.1 2.9 1.59 1.61
E102M68 dσ/dΩ e p η p 2.1 2.9 1.61 1.63
E102M69 dσ/dΩ e p η p 2.1 2.9 1.63 1.65
E102M70 dσ/dΩ e p η p 2.1 2.9 1.65 1.67
E102M71 dσ/dΩ e p η p 2.1 2.9 1.67 1.69
E102M72 dσ/dΩ e p η p 2.1 2.9 1.69 1.71
E102M73 dσ/dΩ e p η p 2.1 2.9 1.71 1.73
E102M74 dσ/dΩ e p η p 2.1 2.9 1.73 1.75
E102M75 dσ/dΩ e p η p 2.1 2.9 1.75 1.77
E102M76 dσ/dΩ e p η p 2.1 2.9 1.77 1.79
E102M77 dσ/dΩ e p η p 2.1 2.9 1.79 1.81
E102M78 dσ/dΩ e p η p 2.1 2.9 1.81 1.83
E102M79 dσ/dΩ e p η p 2.1 2.9 1.83 1.85
E102M80 dσ/dΩ e p η p 2.1 2.9 1.85 1.87
E102M81 dσ/dΩ e p η p 2.1 2.9 1.87 1.89
E102M82 dσ/dΩ e p η p 2.1 2.9 1.89 1.91
E102M83 dσ/dΩ e p η p 2.1 2.9 1.91 1.93
E102M84 σ e p η p 0.13 0.2 1.49 1.66
E102M85 σ e p η p 0.2 0.3 1.49 1.63
E102M86 σ e p η p 0.3 0.4 1.49 1.61
E102M87 σ e p η p 0.2 0.3 1.49 1.64
E102M88 σ e p η p 0.3 0.4 1.49 1.61
E102M89 σ e p η p 0.6 0.8 1.49 2.0
E102M90 σ e p η p 0.8 1.0 1.49 1.9
E102M91 σ e p η p 1.0 1.2 1.49 1.81
E102M92 σ e p η p 1.2 1.4 1.49 1.69
E102M93 σ e p η p 1.3 1.7 1.49 2.31
E102M94 σ e p η p 1.7 2.1 1.49 2.3
E102M95 σ e p η p 2.1 2.5 1.49 2.13
E102M96 σ e p η p 2.5 2.9 1.49 1.93
E102M97 σ e p η p 2.9 3.3 1.49 1.76
E102M98 dσ/dΩT+ε·dσ/dΩL e p η p 0.2 0.4 1.49 1.51
E102M99 dσ/dΩT+ε·dσ/dΩL e p η p 0.2 0.4 1.51 1.53
E102M100 dσ/dΩT+ε·dσ/dΩL e p η p 0.2 0.4 1.53 1.55
Created in SINP MSU, CLAS Collaboration