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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
E1M601 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.45 1.475
E1M602 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.45 1.475
E1M603 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.45 1.475
E1M604 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.45 1.475
E1M605 dσ/dφ(p) e p π+π−p 0.8 1.1 1.45 1.475
E1M606 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.45 1.475
E1M607 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.45 1.475
E1M608 dσ/dψ(p) e p π+π−p 0.8 1.1 1.45 1.475
E1M609 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.45 1.475
E1M610 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.45 1.475
E1M611 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.45 1.475
E1M612 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.475 1.5
E1M613 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.475 1.5
E1M614 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.475 1.5
E1M615 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.475 1.5
E1M616 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.475 1.5
E1M617 dσ/dφ(p) e p π+π−p 0.8 1.1 1.475 1.5
E1M618 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.475 1.5
E1M619 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.475 1.5
E1M620 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.475 1.5
E1M621 dσ/dψ(p) e p π+π−p 0.8 1.1 1.475 1.5
E1M622 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.475 1.5
E1M623 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.475 1.5
E1M624 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.5 1.525
E1M625 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.5 1.525
E1M626 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.5 1.525
E1M627 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.5 1.525
E1M628 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.5 1.525
E1M629 dσ/dφ(p) e p π+π−p 0.8 1.1 1.5 1.525
E1M630 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.5 1.525
E1M631 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.5 1.525
E1M632 dσ/dψ(p) e p π+π−p 0.8 1.1 1.5 1.525
E1M633 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.5 1.525
E1M634 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.5 1.525
E1M635 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.5 1.525
E1M636 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.525 1.55
E1M637 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.525 1.55
E1M638 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.525 1.55
E1M639 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.525 1.55
E1M640 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.525 1.55
E1M641 dσ/dφ(p) e p π+π−p 0.8 1.1 1.525 1.55
E1M642 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.525 1.55
E1M643 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.525 1.55
E1M644 dσ/dψ(p) e p π+π−p 0.8 1.1 1.525 1.55
E1M645 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.525 1.55
E1M646 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.525 1.55
E1M647 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.525 1.55
E1M648 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.55 1.575
E1M649 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.55 1.575
E1M650 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.55 1.575
E1M651 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.55 1.575
E1M652 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.55 1.575
E1M653 dσ/dφ(p) e p π+π−p 0.8 1.1 1.55 1.575
E1M654 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.55 1.575
E1M655 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.55 1.575
E1M656 dσ/dψ(p) e p π+π−p 0.8 1.1 1.55 1.575
E1M657 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.55 1.575
E1M658 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.55 1.575
E1M659 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.55 1.575
E1M660 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.575 1.6
E1M661 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.575 1.6
E1M662 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.575 1.6
E1M663 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.575 1.6
E1M664 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.575 1.6
E1M665 dσ/dφ(p) e p π+π−p 0.8 1.1 1.575 1.6
E1M666 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.575 1.6
E1M667 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.575 1.6
E1M668 dσ/dψ(p) e p π+π−p 0.8 1.1 1.575 1.6
E1M669 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.575 1.6
E1M670 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.575 1.6
E1M671 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.575 1.6
E1M672 dσ/dφ(p) e p π+π−p 0.8 1.1 1.6 1.625
E1M673 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.6 1.625
E1M674 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.6 1.625
E1M675 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.6 1.625
E1M676 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.6 1.625
E1M677 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.6 1.625
E1M678 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.6 1.625
E1M679 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.6 1.625
E1M680 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.6 1.625
E1M681 dσ/dψ(p) e p π+π−p 0.8 1.1 1.6 1.625
E1M682 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.6 1.625
E1M683 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.6 1.625
E1M684 dσ/dφ(p) e p π+π−p 0.8 1.1 1.625 1.65
E1M685 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.625 1.65
E1M686 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.625 1.65
E1M687 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.625 1.65
E1M688 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.625 1.65
E1M689 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.625 1.65
E1M690 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.625 1.65
E1M691 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.625 1.65
E1M692 dσ/dψ(p) e p π+π−p 0.8 1.1 1.625 1.65
E1M693 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.625 1.65
E1M694 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.625 1.65
E1M695 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.625 1.65
E1M696 dσ/dφ(p) e p π+π−p 0.8 1.1 1.65 1.675
E1M697 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.65 1.675
E1M698 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.65 1.675
E1M699 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.65 1.675
E1M700 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.65 1.675
Created in SINP MSU, CLAS Collaboration