The study of electromagnetic and weak form factors of nucleon (charged quasielastic scatterings of neutrino (antineutrino) and nucleon) done in $70^prime s$ and published in Chinese journals is reviewed. In the approach of the study antiquark compone
nts are introduced to the wave functions of nucleon and the study shows that the antiquark components of nucleon play an essential role in the EM and weak form factors of nucleon. The SU(6) symmetric wave functions of baryons in the rest frame ( s-wave in the rest frame) have been constructed. In these wave functions there are both quark and antiquark components. Using Lorentz transformations these wave functions are boosted to moving frame. In terms of effective Lagrangian these wave functions are used to study the EM and weak form factors of nucleon and $p rightarrow Delta$. The ratio $mu_p G^p_E/G^p_M$, $G^n_E$, $G^n_M$, $G^*_M$, $E1+$ and $S1+$ of $p rightarrow Delta$ are predicted. The axial-vector form factors of nucleon is predicted to be $G_A(q^2)/G_A(0) = F^p_1(q^2)$, where the $F^p_1$ is the first Dirac form factor of proton. This prediction agrees with data very well. The pseudoscalar form factor of nucleon is predicted. The model predicts there are three axial-form factors for $prightarrowDelta$ and two of them play dominant roles. The cross sections of $ u_mu + n rightarrow p + mu^-;;bar{ u}_mu + p rightarrow n + mu^+$, $Delta S = 1$ quasielastic neutrino scatterings, and $ u_mu + p rightarrow Delta^{++} + mu^-$ are predicted. Theoretical results are in agreement with data. The study shows that antiquark components of baryons play an essential role in understanding nucleon structure.
The possibility of the $0^+$ $etaeta$ resonance $f_0(2100)$ as a candidate of the $Q^2bar{Q}^2$ state $C^{ss}(36)$ is explored. The $etaeta$ channel of $f_0(2100)$ is the dominant decay mode, $etaeta$ channel has less decay rate, the decay rate of th
e $etaeta$ channel is very small. The $pipi,;Kbar{K},;4pi$ modes are at next leading order in $N_C$ expansion. Other possible decay modes are discussed.
The mixing between the $f_2(1270)$, the $f_2(1525)$, and the $2^{++}$ glueball is determined and tested. The mass and the hadronic decay widths of the $G_2$ and the branching ratio $B(J/psirightarrowgamma G_2)$ are predicted.
A chiral field theory of $0^{-+}$ glueball is presented. The coupling between the quark operator and the $0^{-+}$ glueball field is revealed from the U(1) anomaly. The Lagrangian of this theory is constructed by adding a $0^{-+}$ glueball field to a
successful Lagrangian of chiral field theory of pseudoscalar, vector, and axial-vector mesons. Quantitative study of the physical processes of the $0^{-+}$ glueball of $m=1.405textrm{GeV}$ is presented. The theoretical predictions can be used to identify the $0^{-+}$ glueball.
A chiral field theory of $0^{-+}$ glueball is presented. By adding a $0^{-+}$ glueball field to a successful Lagrangian of chiral field theory of pseudoscalar, vector, and axial-vector mesons, the Lagrangian of this theory is constructed. The couplin
gs between the pseodoscalar glueball field and mesons are via U(1) anomaly revealed. Qualitative study of the physical processes of the $0^{-+}$ glueball of $m=1.405textrm{GeV}$ is presented. The theoretical predictions can be used to identify the $0^{-+}$ glueball.
Decay $Upsilon(1s)togamma f_2(1270)$ is studied by an approach in which the tensor meson, $f_2(1270)$, is strongly coupled to gluons. Besides the strong suppression of the amplitude $Upsilon(1s)togamma gg, ggto f_2$ by the mass of b-quark, d-wave dom
inance in $Upsilon(1s)togamma f_2(1270)$ is revealed from this approach, which provides a large enhancement. The combination of these two factors leads to larger $B(Upsilon(1s)togamma f_2(1270))$. The decay rate of $Upsilon(1s)togamma f_2(1270)$ and the ratios of the helicity amplitudes are obtained and they are in agreement with data.
A new limit of pion form factor at very large $Q^2$ is obtained by using a pion wave function determined from an effective chiral field theory of mesons. It shows that when $Q^2>>(1.8GeV)^2$ the pion form factor reaches the asymptotic limit ${alpha_s(Q^2)over Q^2}$.
A new Lagrangian of EW interactions without spontaneous symmetry breaking, Higgs, and Fadeev-Popov procedure has been constructed. It consists of three parts: $SU(2)_Ltimes U(1)$ gauge fields, massive fermion fields, and their interactions. In this t
heory the gauge coupling constants g, g, and fermion masses are the inputs. A new mechanism of $SU(2)_Ltimes U(1)$ symmetry breaking caused by fermion masses has been found. In the EW theory top quark mass plays a dominant role. This mechanism leads to nonperturbative generation of the gauge fixings and masses of Z and W fields. $m^2_W={1over2}g^2 m^2_t, m^2_Z={1over2}bar{g}^2 m^2_t, G_F=frac{1}{2sqrt{2}m^2_t}$ are revealed from this theory. The propagators of Z- and W-fields without quadratic divergent terms are derived. Very heavy neutral and charged scalars are dynamically generated from this theory too.
The decays of $Upsilon(1s)togamma(eta,eta)$ are studied by an approach which has successfully predicted the ratio $frac{Gamma(J/psitogammaeta)}{Gamma(J/psitogammaeta)}$. Strong dependence on quark mass has been found in the decays $(J/psi, Upsilon(1s
))togamma(eta,eta)$. Very small decay rates of $Upsilon(1s)togamma(eta,eta)$ are predicted.
