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...
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....
The connection between the pion as a Goldstone boson related to spontaneous chiral symmetry breaking and the quark-antiquark structure of the pion is investigated with a chiral effective lagrangian model. The finite pion mass is obtained with current quark masses mu + md of about 20 MeV and sat...
We extend the investigation of the generalized parton distribution for a charged pion within a fully covariant constituent quark model, in two respects: (1) calculating the tensor distribution and (2) adding the treatment of the evolution, needed for achieving a meaningful comparison with both the...
Two photon decays of pion are studied in the framework of the Betheu2013Salpeter equation under Covariant Instantaneous Ansatz where the structure of hadron-quark vertex function u0393 is generalized to include various Dirac covariants (other than u03b35) from their complete set. These covariants ...
We calculate the light-quark condensate, the strange-quark condensate, the pion condensate, and the axial condensate in three-flavor chiral perturbation theory (χPT) in the presence of an isospin chemical potential at next-to-leading order at zero temperature. It is shown that the three-flavor...
Flavor and spin structure of quark fragmentation functions in a diquark model for octet baryons We use a simple quark-diquark model to describe unpolarized, longitudinally polarized, and transversely polarized fragmentation functions for the octet ba... Yang,Jian-Jun - 《Physical Review D》 被引...
In particular, we perform the first model calculation of the full phase diagram at nonzero baryon and isospin density, thus matching the model-independent predictions of chiral perturbation theory at low density to the conjectured phase structure at high density. We confirm the presence of the ...
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...
Such a momentum shell structure may occur dynamically [2]: at small baryon densities, where nuclear interactions play a small role, the matter is purely baryonic since at fixed baryon density the energy per baryon of a free gas of nucleons is smaller than that of constituent quarks. At highe...