Speaker
Description
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.
| Collaboration | CLAS Collaboration |
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