  This paper presents a measurement of the ordering of charged hadrons in the
azimuthal angle relative to the beam axis in high-energy proton-proton
collisions at the Large Hadron Collider (LHC). A spectral analysis of
correlations between longitudinal and transverse components of the momentum of
the charged hadrons, driven by the search for phenomena related to the
structure of the QCD field, is performed. Data were recorded with the ATLAS
detector at centre-of-mass energies of sqrt(s) = 900 GeV and sqrt(s) = 7 TeV.
The correlations measured in a phase space region dominated by low-pT particles
are not well described by conventional models of hadron production. The
measured spectra show features consistent with the fragmentation of a QCD
string represented by a helix-like ordered gluon chain.
