ηphotoproduction on the proton in a chiral constituent quark approach via a one-gluon-exchange model

Abstract

A formalism based on a chiral quark model (χQM) approach complemented with a one-gluon exchange model, to take into account the breakdown of the SU (6) ⊗ O(3) symmetry, is presented.The configuration mixing of wave functions for nucleon and resonances are derived. With few adjustable parameters, differential cross-section and polarized beam asymmetry for the γ p → η p process are calculated and successfully compared with the data in the centre-of-mass energy range from threshold up to 2 GeV. The known resonances S 11 (1535), S 11 (1650), P 13 (1720), D 13 (1520), and F 15 (1680), as well as two new S 11 and D 15 resonances are found to be dominant in the reaction mechanism. Besides, connections among the scattering amplitudes of the χQM approach and the helicity amplitudes, as well as decay widths of resonances are established. Possible contributions from the so-called "missing resonances" are investigated and found to be negligible.

η′photoproduction on the nucleon in the quark model

“…2 The effects of D 15 (2080) can be expected in γp → ηp taking into account the mixing between η ′ and η. A recent quark model study of η photoproduction in the high energy region has reported effects from D 15 (2080) [22,23]. Evidence of D 15 (2080) was also found by a partial wave analysis of the η photoproduction data from CB-ELSA [36] in the BonnGatchina (BnGa) model [37].…”

“…The chiral quark model has been well developed and widely applied to meson photoproduction reactions [16][17][18][19][20][21][22][23][24][25][26][27]. The details about the model can be found in [26,27].…”

Low-energy reactionsK−p→Σ0π0,Λπ0Zhong1, Zhao2 2013Phys. Rev. C133160View full textAdd to dashboardCite

“…As a consequence, configuration mixings would occur, and an analytic solution cannot be achieved. To take into account the breaking of that symmetry, an empirical way [83,84] is to introduce a set of coupling strength parameters, C R , for each resonance amplitude,…”

“…Since the quark-meson coupling is invariant under the chiral transformation, some of the low-energy properties of QCD are retained. The chiral quark model has been well developed and widely applied to meson photoproduction reactions [78][79][80][81][82][83][84][85][86][87][88]. Its recent extension to de- scribe the process of πN [89] andKN [42] scattering, and the charmed hadron strong decays [90][91][92] also turns out to be successful and inspiring.…”

Combined analysis of theπ−p→K0Λ,ηnreactions in a chiral quark model

“…Thus, it has predictive powers when exposed to experimental data, and information about the resonance structures can be extracted. The chiral quark model has been well developed and widely applied to meson photoproduction reactions [48,49,[56][57][58][59][60][61][62][63][64][65][66][67][68]. Recently, this model has been successfully extended to πN and KN reactions as well [43,[69][70][71].…”