Measurement of ep {yields} e{prime} p{pi}{sup +}{pi}{sup -}: experimental procedures and baryon resonance analysis

Journal Article · Tue Apr 01 04:00:00 EST 2003

OSTI ID:837033

Ripani, M; Burkert, V D; Mokeev, V; Battaglieri, M; Vita, R De; Golovach, E; Taiuti, M

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 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 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, Newport News, VA (US)
• Sponsoring Organization: US Department of Energy; USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 837033
• Report Number(s): JLAB-PHY-03-233; DOE/ER/40150-3174; hep-ex/0304034
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BARYONS
CEBAF ACCELERATOR
CROSS SECTIONS
FORECASTING
RESONANCE