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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
E1M301 dσ/dψ(π−) e p π+π−p 1.1 1.5 2.025 2.05
E1M302 dσ/dM(π−,p) e p π+π−p 1.1 1.5 2.025 2.05
E1M303 dσ/dφ(π−) e p π+π−p 1.1 1.5 2.025 2.05
E1M304 dσ/dψ(p) e p π+π−p 1.1 1.5 2.025 2.05
E1M305 dσ/dM(π+,π−) e p π+π−p 1.1 1.5 2.025 2.05
E1M306 dσ/dφ(p) e p π+π−p 1.1 1.5 2.025 2.05
E1M307 dσ/dψ(π+) e p π+π−p 1.1 1.5 2.025 2.05
E1M308 dσ/d(−cos(θ(π−))) e p π+π−p 1.1 1.5 2.025 2.05
E1M309 dσ/d(−cos(θ(π+))) e p π+π−p 1.1 1.5 2.025 2.05
E1M310 dσ/d(−cos(θ(p))) e p π+π−p 1.1 1.5 2.025 2.05
E1M311 dσ/dφ(π+) e p π+π−p 1.1 1.5 2.025 2.05
E1M312 dσ/dψ(p) e p π+π−p 1.1 1.5 2.05 2.075
E1M313 dσ/dψ(π+) e p π+π−p 1.1 1.5 2.05 2.075
E1M314 dσ/dM(π+,p) e p π+π−p 1.1 1.5 2.05 2.075
E1M315 dσ/dM(π−,p) e p π+π−p 1.1 1.5 2.05 2.075
E1M316 dσ/dφ(π−) e p π+π−p 1.1 1.5 2.05 2.075
E1M317 dσ/dφ(π+) e p π+π−p 1.1 1.5 2.05 2.075
E1M318 dσ/dφ(p) e p π+π−p 1.1 1.5 2.05 2.075
E1M319 dσ/dψ(π−) e p π+π−p 1.1 1.5 2.05 2.075
E1M320 dσ/d(−cos(θ(π+))) e p π+π−p 1.1 1.5 2.05 2.075
E1M321 dσ/d(−cos(θ(π−))) e p π+π−p 1.1 1.5 2.05 2.075
E1M322 dσ/d(−cos(θ(p))) e p π+π−p 1.1 1.5 2.05 2.075
E1M323 dσ/dM(π+,π−) e p π+π−p 1.1 1.5 2.05 2.075
E1M324 dσ/dφ(π+) e p π+π−p 1.1 1.5 2.075 2.1
E1M325 dσ/dM(π+,p) e p π+π−p 1.1 1.5 2.075 2.1
E1M326 dσ/dM(π−,p) e p π+π−p 1.1 1.5 2.075 2.1
E1M327 dσ/dφ(π−) e p π+π−p 1.1 1.5 2.075 2.1
E1M328 dσ/dφ(p) e p π+π−p 1.1 1.5 2.075 2.1
E1M329 dσ/dψ(π−) e p π+π−p 1.1 1.5 2.075 2.1
E1M330 dσ/dψ(π+) e p π+π−p 1.1 1.5 2.075 2.1
E1M331 dσ/dψ(p) e p π+π−p 1.1 1.5 2.075 2.1
E1M332 dσ/d(−cos(θ(π−))) e p π+π−p 1.1 1.5 2.075 2.1
E1M333 dσ/d(−cos(θ(π+))) e p π+π−p 1.1 1.5 2.075 2.1
E1M334 dσ/d(−cos(θ(p))) e p π+π−p 1.1 1.5 2.075 2.1
E1M335 dσ/dM(π+,π−) e p π+π−p 1.1 1.5 2.075 2.1
E1M336 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.4 1.425
E1M337 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.4 1.425
E1M338 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.4 1.425
E1M339 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.4 1.425
E1M340 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.4 1.425
E1M341 dσ/dφ(p) e p π+π−p 0.5 0.8 1.4 1.425
E1M342 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.4 1.425
E1M343 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.4 1.425
E1M344 dσ/dψ(p) e p π+π−p 0.5 0.8 1.4 1.425
E1M345 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.4 1.425
E1M346 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.4 1.425
E1M347 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.4 1.425
E1M348 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.425 1.45
E1M349 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.425 1.45
E1M350 dσ/dφ(p) e p π+π−p 0.5 0.8 1.425 1.45
E1M351 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.425 1.45
E1M352 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.425 1.45
E1M353 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.425 1.45
E1M354 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.425 1.45
E1M355 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.425 1.45
E1M356 dσ/dψ(p) e p π+π−p 0.5 0.8 1.425 1.45
E1M357 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.425 1.45
E1M358 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.425 1.45
E1M359 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.425 1.45
E1M360 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.45 1.475
E1M361 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.45 1.475
E1M362 dσ/dφ(p) e p π+π−p 0.5 0.8 1.45 1.475
E1M363 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.45 1.475
E1M364 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.45 1.475
E1M365 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.45 1.475
E1M366 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.45 1.475
E1M367 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.45 1.475
E1M368 dσ/dψ(p) e p π+π−p 0.5 0.8 1.45 1.475
E1M369 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.45 1.475
E1M370 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.45 1.475
E1M371 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.45 1.475
E1M372 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.475 1.5
E1M373 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.475 1.5
E1M374 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.475 1.5
E1M375 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.475 1.5
E1M376 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.475 1.5
E1M377 dσ/dφ(p) e p π+π−p 0.5 0.8 1.475 1.5
E1M378 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.475 1.5
E1M379 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.475 1.5
E1M380 dσ/dψ(p) e p π+π−p 0.5 0.8 1.475 1.5
E1M381 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.475 1.5
E1M382 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.475 1.5
E1M383 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.475 1.5
E1M384 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.5 1.525
E1M385 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.5 1.525
E1M386 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.5 1.525
E1M387 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.5 1.525
E1M388 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.5 1.525
E1M389 dσ/dφ(π+) e p π+π−p 0.5 0.8 1.5 1.525
E1M390 dσ/dψ(p) e p π+π−p 0.5 0.8 1.5 1.525
E1M391 dσ/dφ(p) e p π+π−p 0.5 0.8 1.5 1.525
E1M392 dσ/dψ(π−) e p π+π−p 0.5 0.8 1.5 1.525
E1M393 dσ/dψ(π+) e p π+π−p 0.5 0.8 1.5 1.525
E1M394 dσ/d(−cos(θ(π−))) e p π+π−p 0.5 0.8 1.5 1.525
E1M395 dσ/d(−cos(θ(π+))) e p π+π−p 0.5 0.8 1.5 1.525
E1M396 dσ/d(−cos(θ(p))) e p π+π−p 0.5 0.8 1.525 1.55
E1M397 dσ/dM(π−,p) e p π+π−p 0.5 0.8 1.525 1.55
E1M398 dσ/dM(π+,π−) e p π+π−p 0.5 0.8 1.525 1.55
E1M399 dσ/dM(π+,p) e p π+π−p 0.5 0.8 1.525 1.55
E1M400 dσ/dφ(π−) e p π+π−p 0.5 0.8 1.525 1.55
Created in SINP MSU, CLAS Collaboration