Abstract
In pp scattering at LHC energies, large numbers of elementary scatterings will contribute significantly, and the corresponding high multiplicity events will be of particular interest. Elementary scatterings are parton ladders, identified with color flux tubes. In high multiplicity events, many of these flux tubes are produced in the same space region, creating high energy densities. We argue that there is good reason to employ the successful procedure used for heavy ion collisions: matter is assumed to thermalize quickly, so that the energy from the flux tubes can be taken as initial condition for a hydro-dynamic expansion. This scenario gets spectacular support from very recent results on Bose-Einstein correlations in pp scattering at 900 GeV at the LHC.
Highlights
In case of very high energy pp collisions or heavy ion scatterings already at RHIC, many flux tubes overlap and produce high energy densities
Tubes which exhibit a long range structure in the longitudinal variable ηs, with a typical transverse width of the order of a fermi. This is exactly the width we obtain if we compute the initial energy density in proton– proton scattering at the LHC
This means, if a hydrodynamic treatment is justified for Au–Au collisions at RHIC, it is justified for pp scattering at the LHC, provided the energy densities are high enough, which seems to be the case
Summary
To cite this version: Klaus Werner, Iurii Karpenko, Tanguy Pierog, Marcus Bleicher, Kirill Mikhailov. We argue that there is good reason to employ the successful procedure used for heavy ion collisions: matter is assumed to thermalize quickly, so that the energy from the flux tubes can be taken as initial condition for a hydro-dynamic expansion. This scenario gets spectacular support from very recent results on Bose–Einstein correlations in pp scattering at 900 GeV at the LHC. Tubes which exhibit a long range structure in the longitudinal variable ηs, with a typical transverse width of the order of a fermi This is exactly the width we obtain if we compute the initial energy density in proton– proton scattering at the LHC.
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