Once Again about Beam-Size or MD-Effect at Colliding Beams

Details Once Again about Beam-Size or MD-Effect at Colliding Beams Once Again about Beam-Size or MD-Effect at Colliding Beams

2002-12-06

arxiv.org/abs/hep-ph/0212102v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 Latex page

Scientific paper

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 were given twenty years ago. In recent paper of Baier and Katkov [17] it was claimed that the previous results about bremsstrahlung spectrum have to be revised and an additional subtraction related to the coherent contribution has to be done. This additional term has been calculated with the result that it may be essential for the performed and future experiments. In the present paper we analyze in detail the coherent and incoherent contributions in the conditions, considered in paper [17]. In contract to above claims, we found out that under these conditions the coherent contribution is completely negligible and, therefore, there is no need to revise the previous results.

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