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  • 1990-1994  (6)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Exact baryon and strangeness conservation in hadronic gas models (1992)
    Springer
    The European physical journal 53 (1992), S. 485-491 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The final state in a relativistic ion collision is considered to be described by a hadronic gas model with hard core repulsion. It is found that for large interaction volumes, a description using the grand canonical ensemble could be justified. For a small system however, corrections arising solely from exact strangeness and baryon number conservation cannot be neglected. These corrections are discussed in a systematic way and analytic results for the partition function and the particle numbers are presented. A detailed numerical evaluation is made. Comparisons with recent experimental results is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01625909
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Canonical description of strangeness conservation and particle production (1991)
    Springer
    The European physical journal 51 (1991), S. 137-141 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the production of particles in terms of a statistical formalism requiring strangeness to be exactly conserved while baryon number is treated grand canonically using a chemical potential. A complete treatment is presented for the case where the overall strangeness of the gas is zero and particles having strangeness up to ±3 are present. As an illustration we have applied the above formalism to the description of particle production in proton-proton, proton-nucleus and nucleus-nucleus collisions. In particular theK/π ratio shows a strong dependence on the interaction volume of the system while, in contrast, the ratio $$\bar \Lambda /\Lambda $$ is almost independent of the volume. These results are in qualitative agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579571
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The hadronisation of a quark-gluon plasma (1993)
    Springer
    The European physical journal 58 (1993), S. 347-355 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider two scenarios for the expansion of a quark-gluon plasma. If the evolution is slow enough, the system can remain in equilibrium throughout its entire history up to the freeze-out of a hadron gas; for a very rapid expansion, it may break up into hadrons before or at the confinement transition, without ever going through an equilibrium hadron phase. We compare hadron production rates in the two approaches and show that for a hadronisation temperatureT≏200 MeV and baryonic chemical potential μ B ≲500 MeV, their predictions essentially coincide. Present data on strange particle production lead to values in this range and hence cannot provide a distinction between the two scenarios. Pion, nucleon and non-strange meson production seem to require a considerably lower freeze-out temperature and baryonic chemical potential. In the hadron gas picture, this is in accord with the difference in mean free path of the different hadrons in the medium; it suggests a sequential freeze-out, in which strange hadrons stop interacting earlier than non-strange hadrons. In the quark-gluon plasma break-up, the hadronic final state fails to provide the high entropy per baryon observed in non-strange hadron production. The break-up moreover leads to a decrease of the entropy per baryon; hence it must be conceptually modified before it can be considered as a viable hadronisation mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560356
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Quark-hadron three-phase mixture of baryonic matter (1990)
    Springer
    The European physical journal 45 (1990), S. 687-692 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phase diagrams of strongly interacting baryonic matter are constructed in a phenomenological model assuming three phases: hadrons, quarkgluon plasma and constituent quarks. Three-phase mixture states are considered in detail and it is shown that these states cover a finite area in the energy density-baryonic density plane. Possible hydrodynamic expansion processes involving the three-phase coexistence region in relativistic heavy-ion collisions are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01556283
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Hadronic equation of state and the onset of kaon condensation (1992)
    Springer
    The European physical journal 55 (1992), S. 317-323 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An equation of state is presented which takes the finite size of baryons and of mesons consistently into account and incorporates the contributions of both nonstrange and strange hadrons. All extensive quantities (energy, particle number, entropy) are modified by a factor taking into account the excluded volume due to baryon repulsion. Intensive quantities (pressure) are not modified. This is achieved by introducing a baryon chemical potential, μB, which is shifted from its point-like value, μ B 0 , by a term proportional to the finite volume of a hadron,V 0, as follows: μB=μ B 0 + V0[P0(T, μ B 0 )−P0(T, 0)], whereP 0 is the pressure for pointlike particles. The last term is necessary to conserve baryon number at the phase transition point. The differences between the new equation of state and those considered previously in the literature are discussed. It is shown that kaon condensation sets in only in the mixed phase of the transition, where hadrons, quarks and gluons are present simultaneously in thermodynamical equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01482595
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  • 6
    Electronic Resource
    Electronic Resource
    Transition from a quark-gluon plasma in the presence of a sharp front (1994)
    Springer
    The European physical journal 63 (1994), S. 525-530 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of a sharp front separating the quarkgluon plasma phase from the hadronic phase is investigated. Energy-momentum conservation and baryon number conservation constrain the possible temperature jump across the front. If one assumes that the temperature in the hadronic phase isT≃200 MeV, as has been suggested by numerous results from relativistic ion collisions, one can determine the corresponding temperature in the quark phase with the help of continuity equations across the front. The calculations reveal that the quark phase must be in a strongly supercooled state. The stability of this solution with respect to minor modifications is investigated. In particular the effect of an admixture of hadronic matter in the quark phase (e.g. in the form of bubbles) is considered in detail. In the absence of admixture the transition proceeds via a detonation transition and is accompanied by a substantial super-cooling of the quark-gluon plasma phase. The detonation is accompanied by less supercooling if a small fraction of bubbles is allowed. By increasing the fraction of bubbles the supercooling becomes weaker and eventually the transition proceeds via a smoother deflagration wave.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01580333
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    Paper (German National Licenses)
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