A relativistic quark model wave function of the pion is obtained from a fit to the experimental data, including the charge radius, charge form factor and weak decay constant. The results are quite stable for different choices of quark mass. The two-photon decay width of the neutral pion and...
quark structure available from perturbative QCD, nonperturbative QCD (nonlocal QCD sum rules and light cone sum rules) with the analysis of current data on F_{\pi\gamma\gamma^*}(Q^2), including recent high-precision lattice calculations of the second moment of the pion's distribution ...
内容提示: arXiv:hep-ph/0611114v1 9 Nov 20069th International Workshop Meson-2006Cracow, 9–13 June 2006Pion quark structure in QCDA. P. Bakulev † and A. V. Pimikov ‡Bogolyubov Lab. Theor. Phys., JINR, Dubna, 141980 Russia† bakulev@theor.jinr.ru; ‡ pimikov@theor.jinr....
Decay distributions of the resonances produced in quasi-two-body processes are discussed in the framework of the generalized quark model. Only results whic... A Bia?As,K Zalewski - 《Nuclear Physics B》 被引量: 76发表: 1968年 Vacuum Transitions in Dual Models. 2. Quark Structure of Resonanc...
Two quark propagators with different analytic structure are employed in Bethe-Salpeter type equations for the pion and scalar diquark form factors. One of the quark propagators has been calculated with the inclusion of a trivial (bare) quark-gluon vertex and, as a consequence, contains a compl...
Give the effective number of degrees of freedom in a quark-gluon plasma when a massless strange quark is included. 2. Calculate the critical temperature at the phase boundary between a quark-gluon plasma and a massless pion gas for B1/4 = 200 MeV and μ = 0 (Case I). 3. Calculate B1...
*REVISED VERSION* Two quark propagators with different analytic structure are employed in on and off mass-shell Bethe-Salpeter type equations for the pion and scalar diquark form-factors. One of the quark propagators has been calculated with the inclusion of a trivial quark-gluon vertex and, ...
Commonly, the structure of compact stars were considered as a spherically symmetric object with underlying matter distribution in isotropic type i.e., radial pressure pr and tangential pressure pt are equal. But in the last few decades, it has been observed that anisotropic is a natural physical...
Resonating group kernels for the nine-quark NNN system are used to show that the quark structure of nucleons leads to nonlocal three-body forces which are short ranged and attractive. They give a net contribution of 0.2 MeV to the three-nucleon binding energy, 0.9 MeV via quark-quark intera...
Combining Drell-Yan data on the leading twist quark distribution in the pion with a model for the resonance region at large x , we calculate QCD moments of the pion structure function over a range of Q 2 , and quantify the role of higher twist corrections. Using a parameterization of the...