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

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

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ID	Quantity	Beam	Target	Final state	Q²_min, GeV²	Q²_max, GeV²	W_min, GeV	W_max, GeV
E1M101	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.6	1.625
E1M102	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.6	1.625
E1M103	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.6	1.625
E1M104	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.6	1.625
E1M105	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.6	1.625
E1M106	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.6	1.625
E1M107	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.6	1.625
E1M108	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M109	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M110	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M111	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M112	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M113	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M114	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M115	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M116	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M117	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M118	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M119	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.625	1.65
E1M120	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M121	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M122	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M123	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M124	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M125	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M126	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M127	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M128	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M129	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M130	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M131	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.65	1.675
E1M132	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M133	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M134	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M135	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M136	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M137	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M138	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M139	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M140	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M141	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M142	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M143	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.675	1.7
E1M144	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M145	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M146	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M147	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M148	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M149	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M150	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M151	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M152	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M153	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M154	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M155	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.7	1.725
E1M156	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M157	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M158	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M159	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M160	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M161	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M162	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M163	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M164	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M165	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M166	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M167	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.725	1.75
E1M168	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M169	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M170	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M171	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M172	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M173	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M174	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M175	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M176	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M177	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M178	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M179	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.75	1.775
E1M180	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M181	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M182	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M183	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M184	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M185	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M186	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M187	dσ/dψ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M188	dσ/dψ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M189	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M190	dσ/d(−cos(θ(π⁺)))	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M191	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.775	1.8
E1M192	dσ/dψ(p)	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M193	dσ/dφ(π⁺)	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M194	dσ/d(−cos(θ(π⁻)))	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M195	dσ/d(−cos(θ(p)))	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M196	dσ/dM(π⁺,π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M197	dσ/dM(π⁻,p)	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M198	dσ/dM(π⁺,p)	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M199	dσ/dφ(p)	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825
E1M200	dσ/dφ(π⁻)	e	p	π⁺π⁻p	1.1	1.5	1.8	1.825

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CLAS Physics Database

E93-006 CLAS experiment

Measurements