In this paper, we present our study on the η photoproduction based on the chiral quark model. We find that quark model provides a very good description of the η production with much less parameters, and the threshold region is not a reliable source to determine the ηNN coupling constant due to its strong dependence on the properties of the resonance S11(1535). We suggest that the systematic dat...

The helicity amplitudes A 1/2 and S 1/2 for the electromagnetic transition γ∗N → N∗(1535) are calculated in the quark model that is extended to include the lowest lying qqqqq̄ components in addition to the qqq component. It is found that with admixture of 5-quark components with a proportion of 20% in the nucleon and 25-65% in the N∗(1535) resonance the calculated helicity amplitude A 1/2 decrea...

The main features of nuclear reactions with participation of baryon resonances (∆(1232), S(1535) and Λ(1405)), which are interpreted as a manifestation of the bound states of nucleus and corresponding meson

Max Schlenker, Fördern, Feiern, Verbote. Studien zum Wallfahrtswesen in der Markgrafschaft Baden-Baden (1535 – 1771). Ubstadt-Weiher: verlag regionalkultur 2020. 397 S. ISBN 978-3-95505-235-5, Kart. € 39,80

The coherent photoproduction of η-mesons on spin-zero nuclei is studied in a relativistic, non-local model, which we have previously applied to the coherent photoproduction of pions. We find that different off-shell extrapolations of the elementary production operator lead to large effects in the cross section. We also show that the almost complete suppression of the N (1535) seen in earlier st...

An isobar model containing Born terms, vector meson exchange and nucleon resonances is used to analyze recent η photoproduction data for cross section and beam asymmetry, as well as JLab electroproduction data. Good overall description is achieved up to Q = 4.0 (GeV/c). Besides the dominant S11(1535) resonance, we show that the second S11 resonance, S11(1650), is also necessary to be included i...

We study the two point correlation function of two nucleon currents sandwiched between the vacuum and the pion state. The light cone QCD sum rules are derived for the πNN coupling gπNN and the πNN(1535) coupling gπNN∗ . The contribution from the excited states and the continuum is subtracted cleanly through the double Borel transform with respect to the two external momenta, p1, p 2 2 = (p − q)...

Intravenous injection of substance P (SP) increases renal nerve firing and heart rate in spontaneously hypertensive rats (SHRs) and Wistar-Kyoto rats (WKYs) by stimulating sympathetic ganglia. Blood pressure is increased in SHRs but lowered in WKYs. This study assesses the role of neurokinin-1 (NK(1)) receptors in mediating the ganglion actions of SP. Rats for functional studies were anesthetiz...