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E93-006 CLAS experiment

Spokespersons
V. D. Burkert, M. Ripani
Year
2003
Abstract
The cross section for the reaction ep -> e' p pi+ pi- was measured in the resonance region for 1.4 < W < 2.1 GeV and 0.5 < Q2 < 1.5 GeV2/c2 using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N* and Delta states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P13(1720) resonance or by introducing a new baryon state, not reported in published analyses.
Publication
  1. M. Ripani, V. D. Burkert, V. I. Mokeev, M. Battaglieri, R. De Vita, E. Golovach, V. Tauti, and CLAS Collaboration Measurement of ep->e'p pi+pi- and Baryon Resonance Analysis // Phys. Rev. Let. 91, 022002 (2003)
Quantities
σ   dσ/dM(π−,p)   dσ/dM(π+,p)   dσ/dM(π+,π−)   dσ/d(−cos(θ(π−)))   dσ/d(−cos(θ(π+)))   dσ/d(−cos(θ(p)))   dσ/dφ(π−)   dσ/dφ(π+)   dσ/dφ(p)   dσ/dψ(π−)   dσ/dψ(π+)   dσ/dψ(p)

Measurements

ID Quantity Beam Target Final state Q2min,
GeV2 		Q2max,
GeV2 		Wmin,
GeV 		Wmax,
GeV
E1M701 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.65 1.675
E1M702 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.65 1.675
E1M703 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.65 1.675
E1M704 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.65 1.675
E1M705 dσ/dψ(p) e p π+π−p 0.8 1.1 1.65 1.675
E1M706 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.65 1.675
E1M707 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.65 1.675
E1M708 dσ/dφ(p) e p π+π−p 0.8 1.1 1.675 1.7
E1M709 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.675 1.7
E1M710 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.675 1.7
E1M711 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.675 1.7
E1M712 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.675 1.7
E1M713 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.675 1.7
E1M714 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.675 1.7
E1M715 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.675 1.7
E1M716 dσ/dψ(p) e p π+π−p 0.8 1.1 1.675 1.7
E1M717 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.675 1.7
E1M718 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.675 1.7
E1M719 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.675 1.7
E1M720 dσ/dψ(p) e p π+π−p 0.8 1.1 1.7 1.725
E1M721 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.7 1.725
E1M722 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.7 1.725
E1M723 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.7 1.725
E1M724 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.7 1.725
E1M725 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.7 1.725
E1M726 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.7 1.725
E1M727 dσ/dφ(p) e p π+π−p 0.8 1.1 1.7 1.725
E1M728 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.7 1.725
E1M729 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.7 1.725
E1M730 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.7 1.725
E1M731 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.7 1.725
E1M732 dσ/dψ(p) e p π+π−p 0.8 1.1 1.725 1.75
E1M733 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.725 1.75
E1M734 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.725 1.75
E1M735 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.725 1.75
E1M736 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.725 1.75
E1M737 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.725 1.75
E1M738 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.725 1.75
E1M739 dσ/dφ(p) e p π+π−p 0.8 1.1 1.725 1.75
E1M740 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.725 1.75
E1M741 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.725 1.75
E1M742 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.725 1.75
E1M743 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.725 1.75
E1M744 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.75 1.775
E1M745 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.75 1.775
E1M746 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.75 1.775
E1M747 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.75 1.775
E1M748 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.75 1.775
E1M749 dσ/dφ(p) e p π+π−p 0.8 1.1 1.75 1.775
E1M750 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.75 1.775
E1M751 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.75 1.775
E1M752 dσ/dψ(p) e p π+π−p 0.8 1.1 1.75 1.775
E1M753 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.75 1.775
E1M754 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.75 1.775
E1M755 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.75 1.775
E1M756 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.775 1.8
E1M757 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.775 1.8
E1M758 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.775 1.8
E1M759 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.775 1.8
E1M760 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.775 1.8
E1M761 dσ/dφ(p) e p π+π−p 0.8 1.1 1.775 1.8
E1M762 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.775 1.8
E1M763 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.775 1.8
E1M764 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.775 1.8
E1M765 dσ/dψ(p) e p π+π−p 0.8 1.1 1.775 1.8
E1M766 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.775 1.8
E1M767 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.775 1.8
E1M768 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.8 1.825
E1M769 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.8 1.825
E1M770 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.8 1.825
E1M771 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.8 1.825
E1M772 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.8 1.825
E1M773 dσ/dφ(p) e p π+π−p 0.8 1.1 1.8 1.825
E1M774 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.8 1.825
E1M775 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.8 1.825
E1M776 dσ/dψ(p) e p π+π−p 0.8 1.1 1.8 1.825
E1M777 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.8 1.825
E1M778 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.8 1.825
E1M779 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.8 1.825
E1M780 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.825 1.85
E1M781 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.825 1.85
E1M782 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.825 1.85
E1M783 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.825 1.85
E1M784 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.825 1.85
E1M785 dσ/dφ(p) e p π+π−p 0.8 1.1 1.825 1.85
E1M786 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.825 1.85
E1M787 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.825 1.85
E1M788 dσ/dψ(p) e p π+π−p 0.8 1.1 1.825 1.85
E1M789 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.825 1.85
E1M790 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.825 1.85
E1M791 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.825 1.85
E1M792 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.85 1.875
E1M793 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.85 1.875
E1M794 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.85 1.875
E1M795 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.85 1.875
E1M796 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.85 1.875
E1M797 dσ/dφ(p) e p π+π−p 0.8 1.1 1.85 1.875
E1M798 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.85 1.875
E1M799 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.85 1.875
E1M800 dσ/dψ(p) e p π+π−p 0.8 1.1 1.85 1.875
Created in SINP MSU, CLAS Collaboration