[en] Experimental spectra of the CERN/SPS experiments NA44 and NA49 are fitted while using four different equations of state of nuclear matter within a relativistic hydrodynamic framework. For the freeze-out temperatures, T_f = 139 MeV and T_f = 116 MeV, respectively, the corresponding freeze-out hypersurfaces and Bose-Einstein correlation functions for identical pion pairs are discussed. It is concluded, that the Bose-Einstein interferometry measures the relation between the temperature and the energy density in the equation of state of nuclear matter at the late hadronic stage of the fireball expansion. It is necessary, to use the detailed detector acceptances in the calculations for the Bose-Einstein correlations

[en] We present a theoretical study of ultrarelativistic heavy-ion data obtained at the CERN/SPS by the NA49 collaboration using 3+1- dimensional relativistic hydrodynamics. We find excellent agreement with the rapidity spectra of negative hadrons and protons and with the correlation measurements for Pb + Pb at 160 AGeV (preliminary results). Within our model this implies that for Pb + Pb a quark- gluon plasma of initial volume 174 fm³ with a lifetime 3.4 fm/c was formed

[en] This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The authors used several complimentary models of high-energy nuclear collisions to systematically study the large body of available data from high energy (p_beam/A > 10 GeV/c) heavy ion experiments at BNL and CERN and to prepare for the data that will come from RHIC. One major goal of this project was to better understand the space-time history of the excited hadronic matter formed in these collisions and to use this understanding to improve models of this process. The space-time structure of the system can be extracted from measurements of single-particle p_T distributions and multiparticle correlations. They looked for experimental effects of the formation of the quark-gluon plasma. Understanding the hadronic phase of the interaction determines the sensitivity of experimental measurements to the presence of this exotic state of matter

[en] Experimental spectra of the CERN/SPS experiments NA44 and NA49 are fitted while using four different equations of state of nuclear matter within a relativistic hydrodynamic framework. For the freeze-out temperatures, T_f = 139 MeV and T_f = 116 MeV, respectively, the corresponding freeze-out hypersurfaces and Bose-Einstein correlation functions for identical pion pairs are discussed. It is concluded, that the Bose-Einstein interferometry measures the relationship between the temperature and the energy density in the equation of state of nuclear matter at the late hadronic stage of the fireball expansion. It is necessary, to use the detailed detector acceptances in the calculations for the Bose-Einstein correlations. (author)

[en] Predominantly preliminary single and double inclusive momentum spectra of 158 AGeV Pb+Pb collisions, recently measured by the NA44 and NA49 Collaborations, are reproduced using the relativistic hydrodynamical model HYLANDER-C. Two different equations of state, which both contain a phase transition to a quark-gluon plasma, can be used to reproduce the (preliminary) data. The space-time geometries in the two calculations differ strongly. However, the Bose-Einstein correlation functions of identical pion pairs do not show such a strong, but still a significant sensitivity to the effects of the equations of state. (author)

[en] The relativistic hydrodynamical model HYLANDER-C is used to give estimates for single inclusive particle momentum spectra in √ (s) =200 GeV/nucleon Au+Au collisions that will be investigated experimentally in the near future. The predictions are based on initial conditions that the initial fireball has a longitudinal extension of 1.6 fm and an initial energy density of 30.8 GeV/fm³ as obtained from a cascade model. For the collision energy considered here, different stopping scenarios are explored for the first time. Our calculations give particle yields of the order of 10thinsp000 to 20thinsp000 charged particles per event. copyright 1999 The American Physical Society

[en] Using a (3+1)-dimensional solution of the relativistic Euler-equations for Pb+Pb at 160A GeV, space-time extensions of kaon emission zones are calculated from space-time densities and compared to the inverse widths of two-kaon Bose-Einstein correlation functions. The comparison shows a satisfactory agreement and it is concluded that because of the Gaussian shape of the kaon correlation functions, the space-time parameters of the kaon source can be calculated directly from space-time densities. In the case of intensity interferometry of identical pions this simplification is not recommended when applying Gaussian fits because of the present strong effects of resonance decays. The whole discussion is based on the assumption that hadron emission in ultrarelativistic heavy-ion collisions is purely chaotic or that coherence is at least negligible. copyright 1997 The American Physical Society

[en] We investigate the influence of resonances on Bose-Einstein correlations (BEC's) in the presence of coherence of the pion field. For this purpose a realistic description of resonance production via hydrodynamics is attempted by constraining the initial and freeze-out conditions so that the single inclusive rapidity and transverse momentum distributions are correctly reproduced. We find that even a totally coherent source of ''direct'' pions leads to an appreciable apparent chaoticity because of the important role played by resonances in distorting the correlation function. On the other hand, kaons, being much less affected by resonance decays, seem to be ideal candidates for the experimental investigation of coherence in BEC's. Quantitative predictions of BEC's in S+S reactions at 200A GeV are made

[en] A hydrodynamic model which reproduces the observed rapidity and transverse momentum spectra of mesons and baryons is applied to the study of Bose-Einstein correlations. The pion correlations are found to be strongly affected by resonance decays, except for pairs of large transverse momenta. For S + S at 200 AGeV, in the central rapidity region the effective longitudinal source radii for pions and kaons differ by a factor of 2, the transverse radii by a factor of 1.3. The lifetime of the source can be extracted from kaon interferometry. (orig.)

[en] We investigate the influence of resonances on Bose-Einstein correlations (BEC) in the presence of coherence of the pion field. For this purpose a realistic description of resonance production via hydrodynamics is attempted by constraining the initial and freeze-out conditions so that the single inclusive rapidity and transverse momentum distributions are correctly reproduced. We find that even a totally coherent source of ''direct'' pions leads to an appreciable apparent chaoticity because of the important role played by resonances in distorting the correlation function. On the other hand kaons, being much less affected by resonance decays, seem to be ideal candidates for the experimental investigation of coherence in BEC. Quantitative predictions of BEC in S+S reactions at 200 AGeV are made. (orig.)