What happens at the end of the QCD cascades?
✍ Scribed by Bo Andersson
- Book ID
- 104355534
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 497 KB
- Volume
- 71
- Category
- Article
- ISSN
- 0920-5632
No coin nor oath required. For personal study only.
✦ Synopsis
This is a progress report on recent work done in Lund to describe the final steps in the QCD coherent bremsstrahlung cascades, with particular emphasis on the occurrence of a size parameter c = 11/6 in phase space. Two gluons, being interacting vector particles, will due to helicity conservation effectively stay apart a distance c, counted in generalised rapidity (a notion which I will define in the text but essentially corresponds to rapidity measured along the color flux lines of the field between the gluons). The same size c also occurs in the f~-function as a measure of the region, inside which a virtual gluon splitting via reabsorbtion in the next step of perturbation theory will correspond to a "loss-term" in the Callan-Symanzik equations. Our conclusion is that at the end of the cascades when the dipole masses (Ma) are such that log(M~/A 2) _~ nc with n a few units, then an ordered field of a helix character will emerge, i.e. a set of final "screwy ghions" are emitted in an ordered way in rapidity and azimuthal angle around the dipole axes so that the color lines are turning around.
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