WHAT HAPPENS AT THE END OF THE QCD CASCADES

Authors
Citation
B. Andersson, WHAT HAPPENS AT THE END OF THE QCD CASCADES, Nuclear physics. B, Proceedings supplement, 71, 1999, pp. 79-84
Citations number
3
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Particles & Fields
ISSN journal
0920-5632
Volume
71
Year of publication
1999
Pages
79 - 84
Database
ISI
SICI code
0920-5632(1999)71:<79:WHATEO>2.0.ZU;2-R
Abstract
This is a progress report on recent work done in Lund to describe the final steps in the QCD coherent bremsstrahlung cascades, with particul ar emphasis on the occurrence of a size parameter c = 11/6 in phase sp ace. Two gluons, being interacting vector particles, will due to helic ity conservation effectively stay apart a distance c, counted in gener alised rapidity (a notion which I will define in the text but essentia lly corresponds to rapidity measured along the color flux lines of the field between the gluons). The same size c also occurs in the beta-fu nction as a measure of the region, inside which a virtual gluon splitt ing via reabsorbtion in the next step of perturbation theory will corr espond to a ''loss-term'' in the Callan-Symanzik equations. Our conclu sion is that at the end of the cascades when the dipole masses (Md) ar e such that log(M-d(2)/Lambda(2)) similar or equal to nc with n a few units, then an ordered field of a helix character will emerge, i.e. a set of final ''screwy gluons'' are emitted in an ordered way in rapidi ty and azimuthal angle around the dipole axes so that the color lines are turning around.