1,018 research outputs found
Models for RHIC and LHC: New Developments
We outline inconsistencies in presently used models for high energy nuclear
scattering, which make their application quite unreliable. Many "successes" are
essentially based on an artificial freedom of parameters, which does not exist
when the models are constructed properly.
The problem is the fact that any multiple scattering theory requires an
appropriate treatment of the energy sharing between the individual
interactions, which is technically very difficult to implement. Lacking a
satisfying solution to this problem, it has been simply ignored.
We introduce a fully self-consistent formulation of the multiple-scattering
scheme. Inclusion of soft and hard components - very crucial at high energies -
appears in a "natural way", providing a smooth transition from soft to hard
physics.
We can show that the effect of appropriately considering energy conservation
has a big influence on the results, and MUST therefore be included in any
serious calculation.Comment: talk given at the ``15thInternational Conference on Ultrarelativistic
Nucleus-Nucleus Collisions'', Quark Matter 2001, Stony Brook, USA, January
15-20, 200
The Nexus Model
The interpretation of experimental results at RHIC and in the future also at
LHC requires very reliable and realistic models.
Considerable effort has been devoted to the development of such models during
the past decade, many of them being heavily used in order to analyze data.
There are, however, serious inconsistencies in the above-mentioned approaches.
In this paper, we will introduce a fully self-consistent formulation of the
multiple-scattering scheme in the framework of a Gribov-Regge type effective
theory.Comment: Invited talk given at the International Workshop on the Physics of
the Quark Gluon Plasma, Palaiseau, France, September 4-7, 200
Impact of Uncertainties in Hadron Production on Air-Shower Predictions
At high energy, cosmic rays can only be studied by measuring the extensive
air showers they produce in the atmosphere of the Earth. Although the main
features of air showers can be understood within a simple model of successive
interactions, detailed simulations and a realistic description of particle
production are needed to calculate observables relevant to air shower
experiments. Currently hadronic interaction models are the main source of
uncertainty of such simulations. We will study the effect of using different
hadronic models available in CORSIKA and CONEX on extensive air shower
predictions.Comment: 12 pages, 6 figures, to appear in the proceedings of International
Conference on Interconnection between High Energy Physics and Astroparticle
Physics: From Colliders to Cosmic Rays, Prague, Czech Republic, 7-13 Sep 200
Nuclear Scattering at Very High Energies
We discuss the current understanding of nuclear scattering at very high
energies. We point out several serious inconsistencies in nowadays models,
which provide big problems for any interpretation of data at high energy
nuclear collisions. We outline how to develop a fully self-consistent
formalism, which in addition uses all the knowledge available from studying
electron-positron annihilation and deep inelastic scattering, providing a solid
basis for further developments concerning secondary interactions.Comment: Invited talk at the International Workshop on Relativistic Aspects of
Nuclear Physics, Caraguatatuba, Brazil, Oct. 17-20, 200
Cosmic-ray Monte Carlo predictions for forward particle production in p-p, p-Pb, and Pb-Pb collisions at the LHC
We present and compare the predictions of various cosmic-ray Monte Carlo
models for the energy (dE/deta) and particle (dN/deta) flows in p-p, p-Pb and
Pb-Pb collisions at sqrt(s) = 14, 8.8, and 5.5 TeV respectively, in the range
covered by forward LHC detectors like CASTOR or TOTEM (5.2<|eta|<6.6) and ZDC
or LHCf (|eta|>8.1 for neutrals).Comment: 5 pages, 5 figs. Poster proceedings Quark-Matter'08, Jaipur. To
appear in Indian J. of Phy
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