The Need to Extend the Studies of N* Structure

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Presentation transcript:

The Need to Extend the Studies of N* Structure Studies of N*-electrocouplings over a broad range of photon virtuality Q2 offer unique information on the non-perturbative strong interaction that determines the structure of different excited nucleons. Insight on N* structure from the CLAS@JLAB data on exclusive meson electroproduction (Review papers: I.G. Aznauryan & V.D. Burkert, Progr. Part. Nucl. Phys. 67 (2012) 1; I.G.Aznauryan et al., Int. J. Mod. Phys. E22 (2013) 1330015) . N(1440)1/2+ N(1520)3/2- N(1675)5/2- CLAS results: Quark core dominance Np MB cloud dominance p+p-p p+p-p prel. Consistent results on N*-electrocouplings from independent analyses of different meson electroproduction channels suggest reliable extraction of these fundamental quantities. Complex interplay between internal core of three dressed quarks and external meson-baryon cloud in the structure of N* states is strongly dependent on the resonance quantum numbers. Meson-baryon cloud and quark core Meson-baryon cloud Quark core Growth of relative quark core contribution with Q2 in gradual transition to almost unexplored domain of quark core dominance at Q2>5.0 GeV2.

Jones-Scadron convention N* Structure at High Photon Virtualities in Exploration of Strong Interaction CLAS12 is the only facility foreseen in the world capable of determining electrocouplings of all prominent N* at 5<Q2<12 GeV2. For the first time, almost direct access to the quark core at the distances where the transition from quark-gluon confinement to perturbative QCD regime is expected. D(1232)3/2+ Jones-Scadron convention N(1440)1/2 + Dressed quark mass function D.J. Wilson et al., Phys. Rev C85 (2012) 045205 DSEQCD. I.G. Aznauryan & V.D. Burkert, Phys. Rev. C85 (2012) 055202 LF QM. C.D. Roberts, Prog. Part. Nucl. Phys. (2008) 50. J. Segovia et al., arXiv:1408,2919 [nucl-th]. GM* JLAB : Np CLAS12 projected CLAS12 area Consistent results on quark mass function from electrocouplings of different resonances at Q2 > 5 GeV2: will prove relevance and reliable access to this fundamental ingredient; address two of the most challenging problems in the Standard Model: the emergence of the dominant part of hadron masses and quark-gluon confinement . DSEQCD : (quark core only) constant quark mass. running quark mass. Light Front Quark Model (quark core & MB cloud) running quark mass from DSEQCD. Studies of Nucleon Resonance Structure from the exclusive meson electroproduction experiments with CLAS12@JLAB offer an important contribution to the Long Range Plan.