We calculate the electric quadrupole to magnetic dipole transition ratio E2/M1 for the reaction γN → ∆(1232) in the chiral quark soliton model. The calculated E2/M1 ratio is in a good agreement with the very new experimental data. We obtain non-zero negative value for the electric quadrupole N −∆ transition moment, which suggests an oblate deformed charge structure of the nucleon or/and the del...

J. F. Xu, G. X. Peng, F. Liu, D. F. Hou, L. W. Chen School of Physics, University of Chinese Academy of Sciences, 380 Huaibeizhen, Beijing 101408, China Theoretical Physics Center for Science Facilities, Institute of High Energy Physics, Beijing 100049, China Key Lab. of QLP, Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China Department of Physics and Astronomy, Shan...

This paper describes a study of controlling the coupling between the horizontal and the vertical betatron oscillations in the APS storage ring. Firit, we investigate the strengthening of coupling using two families of skew quadrupoles. Using smooth approximation, we obtained the formulae to estimate the coupling ratio defined as the ratio of the vertical and horizontal emittances or, for a sing...

This paper describes a study of controlling the coupling between the horizontal and the vertical betatron oscillations in the APS storage ring. First, we investigate the strengthening of coupling using two families of skew quadrupoles. Using smooth approximation, we obtained the formulae to estimate the coupling ratio defined as the ratio of the vertical and horizontal emittances or, for a sing...

Inflationary scenarios based on simple non-minimal coupling aφ2R and its generalizations are studied. First, generalizing the form of non-minimal coupling to K(φ)R with an arbitrary function K, we show that the flat potential still is obtainable when V (φ)/K2(φ) is asymptotically constant. Very interestingly, if the ratio of the dimensionless quartic coupling(λ) of the inflaton field and the no...

I review some aspects of supersymmetric grand unification and emphasize a recent development in the area of gauge coupling unification.

Experimental observations on the effect of coupling on synchronization of two mutually coupled nonidentical Chua’s oscillators are presented. We observe that as the coupling strength is gradually increased from the very weak coupling, the oscillators move from nonsynchrony to out-ofphase and then to antiphase synchronization. With further increase of the coupling strength, coexisting antiphase ...

We construct a class of scalar field models coupled to matter that lead to the dependence of masses and coupling constants on the ambient matter density. Such models predict a deviation of couplings measured on the Earth from values determined in low-density astrophysical environments, but do not necessarily require the evolution of coupling constants with the redshift in the recent cosmologica...