Measurement of ep {yields} e{prime}p{pi}{sup +}{pi}{sup -} and Baryon Resonance Analysis

Journal Article · Tue Jul 01 00:00:00 EDT 2003 · Physical Review Letters

OSTI ID:837555

Ripani, Marco

The cross section for the reaction ep {yields} e{prime}p{pi}{sup +}{pi}{sup -} was measured in the resonance region for 1.4 < W < 2.1 GeV and 0.5 < Q{sup 2} < 1.5 GeV{sup 2}/c{sup 2} using the CLAS detector at Jefferson Laboratory. The data shows 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 sizeable change of the properties of the P{sub 13}(1720) resonance or by introducing a new baryon state, not reported in published analyses.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 837555
• Report Number(s): JLAB-PHY-02-138; DOE/ER/40150-3188; hep-ex/0210054; PRLTAO; TRN: US0501022
• Journal Information: Physical Review Letters, Vol. 91; Other Information: PBD: 1 Jul 2003; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BARYONS
CEBAF ACCELERATOR
CROSS SECTIONS
FORECASTING
RESONANCE