PYTHIA8 pp simulations show the underlying-event region extends to 40-140 degrees in azimuth, with universal angular shape but energy-dependent Tsallis parameters from 62.4 GeV to 13 TeV.
Arseneet al.[BRAHMS], Nuclear Physics A757, 1 (2005)
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Evolution of the underlying event and non-extensive thermodynamics in pp collisions from RHIC to LHC energies
PYTHIA8 pp simulations show the underlying-event region extends to 40-140 degrees in azimuth, with universal angular shape but energy-dependent Tsallis parameters from 62.4 GeV to 13 TeV.