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Motivated by the good Tsallis fits to the high-pT spectra in pp collisions atthe LHC, we study the relativistic hard-scattering model and obtain anapproximate analytical expression for the differential hard-scattering crosssection at \eta ~ 0. The power-law behaviour of the transverse spectra, in theform of d\sigma/dpT^2 \propto 1/pT^n, gives a power index n in the range of4.5-5.5 for jet production as predicted by pQCD, after the dependencies of thestructure functions and the running coupling constant are properly taken intoaccount. The power indices for hadron production n are slightly greater thanthose for jet production.

Relativistic Hard-Scattering and Tsallis Fits to pT Spectra in pp Collisions at the LHC