2011 QCD and High Energy Interactions - Rencontres de Moriond ...

The azimuthal ordering should be
visible as a peak in a suitably defined
power spectrum ( in order
to obtain a clear signal, the definition
of the power spectrum has
to reflect the parametrization of
the helix string structure, see discussion
in 3 ). A typical size and
position of the expected signal is
shown in Fig. 3, based on the prediction
of the helix string model
tuned at LEP data.
4 Conclusions
Figure 3: Azimuthal ordering of hadrons can be detected as a peak in
the power spectrum defined according to the expected helix structure.
Pythia modelling of non-diffractive events at √ s=900 GeV.
Generator level study.
The hypothesis of the existence of a helix-like ordered gluon field explains some characteristic
discrepancies between modelling of hadronic processes and the data. The interplay between soft
non-perturbative region and the parton shower activity is better described using the helix string
hypothesis (the comparison is done using a representative set of inclusive charged spectra and
event shape variables). The helix string scenario predicts azimuthal ordering of direct hadrons,
experimentally observable at LHC. If confirmed, such an effect may be considered a first direct
evidence in favour of the helix-like QCD string.
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