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In the standard pQCD picture particles are produced via the parton jetfragmentation process. However, there are also other production mechanisms likehigher twist (HT) processes. A usual example of a HT process is a directproduction of an outgoing hadron, where the hadron is produced in the hardsubprocess without fragmentation.  We study the HT phenomena using a shape analysis (xT scaling) of theinclusive invariant cross sections of charged hadrons, measured by the ALICEcollaboration at center-of-mass energies \sqrt{s}=2.76 TeV and 7 TeV. The datais compared to PYTHIA8 event generator and to a phenomenological model for HT.Using PYTHIA8, we explore a possible enhancement of HT phenomena for isolatedparticles, by comparing the shapes of the isolated distributions to inclusivedistributions. The results from the standard PYTHIA8, without HT, is comparedto a PYTHIA8 where we had included a HT process.  Finally, we found out that the effects observed in the xT spectra originatefrom kinematic biases posed by the isolation cuts, rather than from anenrichment of the HT hadrons at the observed cross sections. A more detaileddata analysis is ongoing.

Studying possible higher twist contributions in the inclusive charged hadron cross sections