TL;DR
This paper discusses recent experimental results from Jefferson Lab on nucleon resonance transition form factors, confirming quark model predictions and exploring new excited nucleon states.
Contribution
It presents new measurements of transition form factors, including the first extraction of the longitudinal amplitude for S11(1535), and discusses the search for predicted excited states.
Findings
Confirmation of the Roper as the first radial excitation of the nucleon.
First extraction of the longitudinal transition amplitude to S11(1535).
Observation of a helicity transition in D13(1520) resonance at different Q2 levels.
Abstract
Recent measurements of nucleon resonance transition form factors with CLAS at Jefferson Lab are discussed. The new data confirm the assertion of the symmetric constituent quark model of the Roper as the first radial excitation of the nucleon. For the first time, the longitudinal transition amplitude to the S11(1535) was extracted from the data. New results on the transition amplitudes for the D13(1520) resonance are presented showing a rapid transition from helicity 3/2 dominance seen at the real photon point to helicity 1/2 dominance at higher Q2. I also discuss aspects of the JLab program to search for new excited nucleon states predicted by quark models.
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