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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
E1M501 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.725 1.75
E1M502 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.725 1.75
E1M503 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.725 1.75
E1M504 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.75 1.775
E1M505 dσ/dφ(p) e p π+π−p 0.5 0.8 1.75 1.775
E1M506 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.75 1.775
E1M507 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.75 1.775
E1M508 dσ/dψ(p) e p π+π−p 0.5 0.8 1.75 1.775
E1M509 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.75 1.775
E1M510 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.75 1.775
E1M511 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.75 1.775
E1M512 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.75 1.775
E1M513 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.75 1.775
E1M514 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.75 1.775
E1M515 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.75 1.775
E1M516 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.775 1.8
E1M517 dσ/dφ(p) e p π+π−p 0.5 0.8 1.775 1.8
E1M518 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.775 1.8
E1M519 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.775 1.8
E1M520 dσ/dψ(p) e p π+π−p 0.5 0.8 1.775 1.8
E1M521 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.775 1.8
E1M522 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.775 1.8
E1M523 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.775 1.8
E1M524 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.775 1.8
E1M525 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.775 1.8
E1M526 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.775 1.8
E1M527 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.775 1.8
E1M528 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.8 1.825
E1M529 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.8 1.825
E1M530 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.8 1.825
E1M531 dσ/dφ(p) e p π+π−p 0.5 0.8 1.8 1.825
E1M532 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.8 1.825
E1M533 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.8 1.825
E1M534 dσ/dψ(p) e p π+π−p 0.5 0.8 1.8 1.825
E1M535 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.8 1.825
E1M536 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.8 1.825
E1M537 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.8 1.825
E1M538 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.8 1.825
E1M539 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.8 1.825
E1M540 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.825 1.85
E1M541 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.825 1.85
E1M542 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.825 1.85
E1M543 dσ/dφ(p) e p π+π−p 0.5 0.8 1.825 1.85
E1M544 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.825 1.85
E1M545 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.825 1.85
E1M546 dσ/dψ(p) e p π+π−p 0.5 0.8 1.825 1.85
E1M547 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.825 1.85
E1M548 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.825 1.85
E1M549 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.825 1.85
E1M550 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.825 1.85
E1M551 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.825 1.85
E1M552 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.85 1.875
E1M553 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.85 1.875
E1M554 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.85 1.875
E1M555 dσ/dφ(p) e p π+π−p 0.5 0.8 1.85 1.875
E1M556 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.85 1.875
E1M557 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.85 1.875
E1M558 dσ/dψ(p) e p π+π−p 0.5 0.8 1.85 1.875
E1M559 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.85 1.875
E1M560 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.85 1.875
E1M561 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.85 1.875
E1M562 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.85 1.875
E1M563 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.85 1.875
E1M564 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.875 1.9
E1M565 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.875 1.9
E1M566 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.875 1.9
E1M567 dσ/dφ(p) e p π+π−p 0.5 0.8 1.875 1.9
E1M568 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.875 1.9
E1M569 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.875 1.9
E1M570 dσ/dψ(p) e p π+π−p 0.5 0.8 1.875 1.9
E1M571 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.875 1.9
E1M572 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.875 1.9
E1M573 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.875 1.9
E1M574 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.875 1.9
E1M575 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.875 1.9
E1M576 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.4 1.425
E1M577 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.4 1.425
E1M578 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.4 1.425
E1M579 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.4 1.425
E1M580 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.4 1.425
E1M581 dσ/dψ(p) e p π+π−p 0.8 1.1 1.4 1.425
E1M582 dσ/dφ(p) e p π+π−p 0.8 1.1 1.4 1.425
E1M583 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.4 1.425
E1M584 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.4 1.425
E1M585 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.4 1.425
E1M586 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.4 1.425
E1M587 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.4 1.425
E1M588 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.425 1.45
E1M589 dσ/dM(π+,π−) e p π+π−p 0.8 1.1 1.425 1.45
E1M590 dσ/dM(π+,p) e p π+π−p 0.8 1.1 1.425 1.45
E1M591 dσ/dφ(π−) e p π+π−p 0.8 1.1 1.425 1.45
E1M592 dσ/dφ(π+) e p π+π−p 0.8 1.1 1.425 1.45
E1M593 dσ/dφ(p) e p π+π−p 0.8 1.1 1.425 1.45
E1M594 dσ/dψ(π−) e p π+π−p 0.8 1.1 1.425 1.45
E1M595 dσ/d(−cos(θ(p))) e p π+π−p 0.8 1.1 1.425 1.45
E1M596 dσ/dψ(π+) e p π+π−p 0.8 1.1 1.425 1.45
E1M597 dσ/dψ(p) e p π+π−p 0.8 1.1 1.425 1.45
E1M598 dσ/d(−cos(θ(π−))) e p π+π−p 0.8 1.1 1.425 1.45
E1M599 dσ/d(−cos(θ(π+))) e p π+π−p 0.8 1.1 1.425 1.45
E1M600 dσ/dM(π−,p) e p π+π−p 0.8 1.1 1.45 1.475
Created in SINP MSU, CLAS Collaboration