Geodesic
Analyticity of the $3\to 3$ forward amplitude in the neighborhood of the physical region
Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 2, pp. 151-161 Cet article a éte moissonné depuis la source Math-Net.Ru

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The general principles of quantum field theory are used to prove analyticity of the invariant amplitude in a complex neighborhood of sufficiently large above-threshold values of the invariant variables on the energy shell and to estimate the size of the neighborhood with respect to all the variables. 
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     author = {L. M. Muzafarov and V. P. Pavlov},
     title = {Analyticity of the $3\to 3$ forward amplitude in the neighborhood of the physical region},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {151--161},
     year = {1978},
     volume = {35},
     number = {2},
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L. M. Muzafarov; V. P. Pavlov. Analyticity of the $3\to 3$ forward amplitude in the neighborhood of the physical region. Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 2, pp. 151-161. http://geodesic.mathdoc.fr/item/TMF_1978_35_2_a1/

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