Monday, June 24, 2013

1305.2627 (Cheuk-Yin Wong et al.)

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

Cheuk-Yin Wong, Grzegorz Wilk
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 transverse momentum. We investigate whether the few degrees of freedom in the Tsallis parametrization may arise from the relativistic parton-parton hard-scattering and related processes. The effects of the multiple hard-scattering and parton showering processes on the power law are discussed. We find empirically that whereas the transverse spectra of both hadrons and jets exhibit power-law behavior of 1/pT^n at high pT, the power indices n for hadrons are systematically greater than those for jets, for which n~4-5.
View original:

No comments:

Post a Comment