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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
E1M401 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.525 1.55
E1M402 dσ/dψ(p) e p π+π−p 0.5 0.8 1.525 1.55
E1M403 dσ/dφ(p) e p π+π−p 0.5 0.8 1.525 1.55
E1M404 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.525 1.55
E1M405 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.525 1.55
E1M406 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.525 1.55
E1M407 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.525 1.55
E1M408 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.55 1.575
E1M409 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.55 1.575
E1M410 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.55 1.575
E1M411 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.55 1.575
E1M412 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.55 1.575
E1M413 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.55 1.575
E1M414 dσ/dφ(p) e p π+π−p 0.5 0.8 1.55 1.575
E1M415 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.55 1.575
E1M416 dσ/dψ(p) e p π+π−p 0.5 0.8 1.55 1.575
E1M417 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.55 1.575
E1M418 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.55 1.575
E1M419 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.55 1.575
E1M420 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.575 1.6
E1M421 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.575 1.6
E1M422 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.575 1.6
E1M423 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.575 1.6
E1M424 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.575 1.6
E1M425 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.575 1.6
E1M426 dσ/dφ(p) e p π+π−p 0.5 0.8 1.575 1.6
E1M427 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.575 1.6
E1M428 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.575 1.6
E1M429 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.575 1.6
E1M430 dσ/dψ(p) e p π+π−p 0.5 0.8 1.575 1.6
E1M431 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.575 1.6
E1M432 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.6 1.625
E1M433 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.6 1.625
E1M434 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.6 1.625
E1M435 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.6 1.625
E1M436 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.6 1.625
E1M437 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.6 1.625
E1M438 dσ/dφ(p) e p π+π−p 0.5 0.8 1.6 1.625
E1M439 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.6 1.625
E1M440 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.6 1.625
E1M441 dσ/dψ(p) e p π+π−p 0.5 0.8 1.6 1.625
E1M442 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.6 1.625
E1M443 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.6 1.625
E1M444 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.625 1.65
E1M445 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.625 1.65
E1M446 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.625 1.65
E1M447 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.625 1.65
E1M448 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.625 1.65
E1M449 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.625 1.65
E1M450 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.625 1.65
E1M451 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.625 1.65
E1M452 dσ/dφ(p) e p π+π−p 0.5 0.8 1.625 1.65
E1M453 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.625 1.65
E1M454 dσ/dψ(p) e p π+π−p 0.5 0.8 1.625 1.65
E1M455 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.625 1.65
E1M456 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.65 1.675
E1M457 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.65 1.675
E1M458 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.65 1.675
E1M459 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.65 1.675
E1M460 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.65 1.675
E1M461 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.65 1.675
E1M462 dσ/dφ(p) e p π+π−p 0.5 0.8 1.65 1.675
E1M463 dσ/dψ(p) e p π+π−p 0.5 0.8 1.65 1.675
E1M464 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.65 1.675
E1M465 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.65 1.675
E1M466 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.65 1.675
E1M467 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.65 1.675
E1M468 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.675 1.7
E1M469 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.675 1.7
E1M470 dσ/dψ(p) e p π+π−p 0.5 0.8 1.675 1.7
E1M471 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.675 1.7
E1M472 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.675 1.7
E1M473 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.675 1.7
E1M474 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.675 1.7
E1M475 dσ/dφ(p) e p π+π−p 0.5 0.8 1.675 1.7
E1M476 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.675 1.7
E1M477 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.675 1.7
E1M478 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.675 1.7
E1M479 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.675 1.7
E1M480 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.7 1.725
E1M481 dσ/dφ(p) e p π+π−p 0.5 0.8 1.7 1.725
E1M482 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.7 1.725
E1M483 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.7 1.725
E1M484 dσ/dψ(p) e p π+π−p 0.5 0.8 1.7 1.725
E1M485 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.7 1.725
E1M486 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.7 1.725
E1M487 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.7 1.725
E1M488 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.7 1.725
E1M489 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.7 1.725
E1M490 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.7 1.725
E1M491 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.7 1.725
E1M492 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.725 1.75
E1M493 dσ/dφ(p) e p π+π−p 0.5 0.8 1.725 1.75
E1M494 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.725 1.75
E1M495 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.725 1.75
E1M496 dσ/dψ(p) e p π+π−p 0.5 0.8 1.725 1.75
E1M497 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.725 1.75
E1M498 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.725 1.75
E1M499 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.725 1.75
E1M500 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.725 1.75
Created in SINP MSU, CLAS Collaboration