$$\pi^{+}\pi^{-} p$$ Electroproduction Cross Sections off Protons in the Second Resonance Region

Conference · Mon Apr 01 00:00:00 EDT 2013

DOI:https://doi.org/10.2172/1962073· OSTI ID:1962073

Fedotov, Gleb ^[1]; Gothe, Ralf ^[2]; Mokeev, Viktor ^[3]

---

1. Moscow State University, Moscow, Russia
2. University of South Carolina, Columbia, SC
3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

In this talk we present preliminary $$\pi^{+}\pi^{-} p$$ electroproduction cross sections off protons in the kinematical area of W from 1.4 to 1.8 ~ GeV and Q^2 from 0.4 to 1.1~GeV2. Our kinematical coverage in part overlap with previous CLAS measurements, but offers more than a factor six finer binning in Q2. The physics analysis of these data within the framework of the JM model will allow us to determine the electrocouplings and the partial pi Delta, rho p decay widths of several high lying nucleon resonances S31(1620), S11(1650), F15(1685), D33(1700), P13(1720) and to further explore the evidence for the 3/2+(1720) candidate-state. Analysis of the single pion electroproduction data measured with CLAS in the aforementioned kinematic region is in progress. Single and charged double pion exclusive channels are major contributors to the meson electroproduction in the N* excitation region with different non-resonant mechanisms. A successful description of all observables in these exclusive channels with consistent N* electrocouplings will offer evidence for the reliable evaluation of these fundamental quantities.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1962073
• Report Number(s): JLAB-PHY-13-1872; DOE/OR/23177-5798
• Country of Publication: United States
• Language: English