Geodesic
Quasiclassical approximation in quantum-field theory with a static nucleon
Teoretičeskaâ i matematičeskaâ fizika, Tome 3 (1970) no. 3, pp. 320-325 Cet article a éte moissonné depuis la source Math-Net.Ru

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The functional integration technique is used to solve the scattering problem in quantum-field theory with a static nucleon and charged me sons under the assumption that the constant $\hbar/g$ is small. In the same quasiclassical approximation, the $\tau_i$-matrices are “disentangled”. The solution is represented in the form of a main term containing the large constant $g^2/\hbar$ and the corrections to it of order $\hbar/g$. 
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B. M. Barbashov; V. N. Pervushin. Quasiclassical approximation in quantum-field theory with a static nucleon. Teoretičeskaâ i matematičeskaâ fizika, Tome 3 (1970) no. 3, pp. 320-325. http://geodesic.mathdoc.fr/item/TMF_1970_3_3_a1/

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