35,319 research outputs found
The Phillips - Barger model for the elastic cross section and the Odderon
Inspired by the recent TOTEM data for the elastic proton -- proton ()
scattering at 8 and 13 TeV, we update previous studies of the
differential cross sections using the Phillips -- Barger (PB) model, which
parametrizes the amplitude in terms of a small number of free parameters. We
demonstrate that this model is able to describe the recent data on a
statistically acceptable way. Additionally, we perform separate fits of the
data for each center - of - mass energy and propose a parametrization for
the energy dependence of the parameters present in the PB model. As a
consequence, we are able to present the PB predictions for the elastic proton -
proton cross section at GeV and TeV, which are compared
with the existing antiproton -- proton () data. We show that the PB
predictions, constrained by the data, are not able to describe the
data. In particular, the PB model predicts a dip in the differential
cross section that is not present in the data. Such result suggests
the contribution of the Odderon exchange at high energies.Comment: 6 pages, 4 tables, 2 figures, results updated, matches published
versio
Thermal radiation and inclusive production in the running coupling -- factorization approach
The characteristics of the thermal radiation are investigated using a two -
component model, with the hard component being described by the Color Glass
Condensate formalism. The inclusive transverse momentum spectra of charged
hadrons produced in proton - proton and proton - nucleus collisions at LHC
energies and large - are estimated using the running coupling -
factorization formula and the solution of the Balitsky - Kovchegov equation.
Our results indicate that the thermal term is necessary to describe the
experimental data and that the effective thermal temperature has an energy
dependence similar to the saturation scale. We demonstrate that the enhancement
of the thermal temperature in collisions is consistent with that
predicted by the saturation scale.Comment: 8 pages, 4 figures, 1 tabl
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