Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-07-18
Phys.Rev.ST Accel.Beams 7 (2004) 101001
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 LaTeX pages, 3 eps Figs
Scientific paper
10.1103/PhysRevSTAB.7.101001
For several processes at colliding beams, macroscopically large impact parameters give an essential contribution to the standard cross section. These impact parameters may be much larger than the transverse sizes of the colliding bunches. In that case, the standard calculations have to be essentially modify. The corresponding formulae for such a beam-size effect were given twenty years ago without taking into account correlations of particle coordinates in the beams. In the present paper we derive formulae which necessary to take into account quantitatively the effect of particle correlations in the spectrum of bremsstrahlung as well as in pair production. Besides, we consider critically recent papers of Baier and Katkov [Phys. Rev. D {\bf 66}, 053009 (2002) and hep-ph/0305304] in which it was calculated a new additional ``subtraction term'' related to the coherent contribution into beam-size effect. We show that this result is groundless and point out the origin of the mistake.
Kotkin G. L.
Serbo Valery G.
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