CHARGE RADII AND MAGNETIC POLARIZABILITIES OF ρ and K MESONS IN QCD STRING THEORY
نویسنده
چکیده
The effective action for light mesons in the external uniform static electromagnetic fields was obtained on the basis of QCD string theory. We imply that in the presence of light quarks the area law of the Wilson loop integral is valid. The approximation of the Nambu-Goto straight-line string is used to simplify the problem. The Coulomb-like short-range contribution which goes from one-gluon exchange is also neglected. We do not take into account spin-orbital and spin-spin interactions of quarks and observe the ρ and K mesons. The wave function of the meson ground state is the Airy function. Using the virial theorem we estimate the mean charge radii of mesons in terms of the string tension and the Airy function zero. On the basis of the perturbative theory, in the small external magnetic field we find the diamagnetic polarizabilities of ρ and K mesons: βρ = −0.8 × 10−4 fm, βK∗ = −0.57× 10−4 fm
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/ 99 08 35 6 v 1 1 3 A ug 1 99 9 CHARGE RADII AND MAGNETIC POLARIZABILITIES OF THE ρ and K ∗ MESONS IN QCD STRING THEORY
The effective action for light mesons in the external uniform static electromagnetic fields has been obtained on the basis of QCD string theory. We argue for an area law of the Wilson loop in the presence of light quarks. The Nambu-Goto straight-line string approximation is used to simplify the problem. The Coulomb-like short-range contribution from one-gluon exchange has also been neglected. W...
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