Geodesic
Evolution of the pion wave function in the scalar $\varphi^3_{(6)}$ model: Two-loop calculation
Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 1, pp. 44-59

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For the example of the $\varphi^3_{(6)}$ model, the structure of the evolution kernels $V(x,y)$ and $P(z)$ is investigated in the two-loop approximation. The properties of the solution of the evolution equation for $b_0\neq 0$ are analyzed. In the case $b_0=0$ (which corresponds to the absence of charge renormalization in the one-loop approximation), the explicit form of the multiplicatively renormalizable composite operators is found. It is shown that these operators are not identical to conformal tensors, though they have a similar structure. 
@article{TMF_1985_65_1_a4,
     author = {S. V. Mikhailov and A. V. Radyushkin},
     title = {Evolution of the pion wave function in the scalar $\varphi^3_{(6)}$ model: {Two-loop} calculation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {44--59},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_65_1_a4/}
}
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S. V. Mikhailov; A. V. Radyushkin. Evolution of the pion wave function in the scalar $\varphi^3_{(6)}$ model: Two-loop calculation. Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 1, pp. 44-59. http://geodesic.mathdoc.fr/item/TMF_1985_65_1_a4/