TSALLIS FITS TO pT SPECTRA FOR pp COLLISIONS AT THE LHC

Phenomenological Tsallis fits to the CMS and ATLAS transverse spectra of charged particles were found to extend for pT from 0.5 to 181 GeV in pp collisions at the LHC at √ s = 7 TeV, and for pT from 0.5 to 31 GeV at s = 0.9 TeV. The simplicity of the Tsallis parametrization and the large range of the fitting transverse momentum raise questions on the physical meaning of the degrees of freedom that enter into the Tsallis distribution or q-statistics. DOI:10.5506/APhysPolB.43.2047 PACS numbers: 05.90.+m, 24.10.Pa, 25.75.Ag, 24.60.Ky Recently, there is a lot of interest in the Tsallis fit to the transverse momentum data of charged particles measured at very high energies of the RHIC and LHC experiments [1–6]. By this, one understands that the use of the Tsallis distribution with a normalization constant Cq hq (pT) = Cq 1 − (1 − q) pT

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