New Baryon State N'(1720)3/2+ from the CLAS pi^+pi^--p Photo- and Electroproduction Data

Conference · Sat May 01 04:00:00 EDT 2021

DOI:https://doi.org/10.2172/1973251· OSTI ID:1973251

Mokeev, Viktor ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Combined studies of exclusive meson photo- and electroproduction have extended the capabilities in the search for new excited states of the nucleon, the so called ?missing? resonances. New excited state of the nucleon, N?(1720)3/2+ has been observed in the combined studies of the pi^+pi^-p photo- and electroproduction off protons data measured with the CLAS detector at Jlab. The results on the new baryon state observation will be presented and discussed in the talk. A successful description of the pi^+pi^-p photo- and electroproduction data achieved with independent from photon virtualities (Q^2) mass, total and partial hadronic decay widths of N?(1720)3/2^+ state offers a strong evidence for the existence of this new resonance. Currently, N?(1720)3/2^+ resonance is the only observed new baryon state for which the results on Q^2-evolution of the electroexcitation amplitudes have become available. They offer an insight into the ?missing? resonance structure for the first time. Future analyses of the N?(1720)3/2^+ electroexcitation amplitudes will shed light on the particular structural features of ?missing? resonances which made their observation so challenging for decades

• 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: 1973251
• Report Number(s): JLAB-PHY-21-3617; DOE/OR/23177-6181
• Country of Publication: United States
• Language: English