About the helix structure of the Lund string

Details About the helix structure of the Lund string About the helix structure of the Lund string

2011-01-12

arxiv.org/abs/1101.2407v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

1+14 pages, 10 figures

Scientific paper

The helix structure of the Lund string, first derived from studies devoted to the emission of soft gluons at the end of the parton cascade, may be at the origin of certain characteristic discrepancies observed in the low transverse momentum region at LEP and LHC. A study of the relation between different helix implementations and observable effects is presented. The model is extended to cover a multiparton string topology (result of parton shower), and compared with the experimental data. It is found that a helix-ordered string with a regular winding (proportional to the energy density stored in the string), is favoured by the inclusive single-particle spectra measured in the hadronic decay of Z$^0$.

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