Asymmetric 1+1-dimensional hydrodynamics in collision

Abstract

The possibility that particle production in high-energy collisions is a result of two asymmetric hydrodynamic flows is investigated, using the Khalatnikov form of the 1+1-dimensional approximation of hydrodynamic equations. The general solution is discussed and applied to the physically appealing "generalized in-out cascade" where the space-time and energy-momentum rapidities are equal at initial temperature but boost-invariance is not imposed. It is demonstrated that the two-bump structure of the entropy density, characteristic of the asymmetric input, changes easily into a single broad maximum compatible with data on particle production in symmetric processes. A possible microscopic QCD interpretation of asymmetric hydrodynamics is proposed.

10 pages, 4 (double) figures

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• The pseudorapidity distributions of the produced charged particles in p-p collisions at center-of-mass energies from 23.6 to 900 GeV
• A description of the transverse momentum distributions of charged particles produced in heavy ion collisions at RHIC and LHC energies
• A description of pseudorapidity distributions of charged particles produced in Au+Au collisions at RHIC energies