Tsallis Fits to p_T Spectra and Multiple Hard Scattering in pp Collisions at LHC

Journal Article · Tue Jan 01 04:00:00 EST 2013 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.87.114007· OSTI ID:1082996

Wong, Cheuk-Yin ^[1]; Wilk, Grzegorz ^[2]

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1. ORNL
2. National Centre for Nuclear Research, Warsaw, Poland

Phenomenological Tsallis fits to the CMS, ATLAS, and ALICE transverse momentum spectra of hadrons for pp collisions at LHC were recently found to extend over a large range of the fitting transverse momentum. We investigate whether the few degrees of freedom in the Tsallis parametrization may arising from the relativistic parton-parton hard-scattering and related hard processes. The effects of multiple hard-scattering and parton showering on the power law are discussed. We find that although the transverse spectra of both hadrons and jets exhibit power-law behaviour of 1/pT^n at high pT, the power indices n for hadrons are categorically greater than those for jets, for which n~4.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1082996
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 11 Vol. 87; ISSN 1550-7998
• Country of Publication: United States
• Language: English