Searching for squeezed particle-antiparticle correlations in high energy heavy ion collisions

Squeezed correlations of particle-antiparticle pairs were predicted to exist if the hadron masses were modified in the hot and dense medium formed in high energy heavy ion collisions. Although well-established theoretically, they have not yet been observed experimentally. We suggest here a clear method to search for such signal, by analyzing the squeezed correlation functions in terms of measurable quantities. We illustrate this suggestion for simulated phi-phi pairs at RHIC energies.Comment: Revised extended text, one plot added, one figure was moved to another page in the paper (total of 3 figures, Fig. (2) having parts a, b and c); added acknowledgmen

Topics on Hydrodynamic Model of Nucleus-Nucleus Collisions

A survey is given on the applications of hydrodynamic model of nucleus-nucleus collisons, focusing especially on i) the resolution of hydrodynamic equations for arbitrary configurations, by using the smoothed-particle hydrodynamic approach; ii) effects of the event-by-event fluctuation of the initial conditions on the observables; iii) decoupling criteria; iv) analytical solutions; and others.Comment: 30 pages, 29 figures; corrected typo

On the necessity to include event-by-event fluctuations in experimental evaluation of elliptical flow

Elliptic flow at RHIC is computed event-by-event with NeXSPheRIO. We show that when symmetry of the particle distribution in relation to the reaction plane is assumed, as usually done in the experimental extraction of elliptic flow, there is a disagreement between the true and reconstructed elliptic flows (15-30% for $\eta$=0, 30% for $p_\perp$=0.5 GeV). We suggest a possible way to take into account the asymmetry and get good agreement between these elliptic flows

Comparing Particle Emission Scenarios In Hydrodynamics: Continuous Emission Vs. Freeze-out

The usual particle emission scenario used in hydrodynamics presupposes that particles instantaneously stop interacting (freeze-out) once they reach some three dimensional surface. Another formalism has been developed recently where particle emission occurs continuously during the whole expansion of thermalized matter. Here we compare both mechanisms in a simplified hydrodynamical framework and show that they lead to a drastically different interpretation of data.54417433Satz, H., (1991) Nucl. Phys., A525, pp. 1cCooper, F., Frye, G., (1974) Phys. Rev., D10, p. 186Grassi, F., Hama, Y., Kodama, T., (1995) Phys. Lett., B355, p. 9(1996) Z. Phys., C73, p. 153Bjorken, J.D., (1983) Phys. Rev., D27, p. 140Ruuskanen, P.V., (1987) Acta Phys. Polonica, B18, p. 551Åkesson, T., (1990) Z. Phys., C46, p. 365Bamberger, A., (1988) Z. Phys., C38, p. 89(1989) Nucl. Phys., A498, pp. 133cTakahashi, Y., (1991) Nucl. Phys., A525, pp. 591cBamberger, A., (1989) Z. Phys., C43, p. 25(1990) Z. Phys., 48, p. 191Andersen, E., (1992) Phys. Lett., B294, p. 127Abatzis, S., (1991) Phys. Lett., B270, p. 123Lee, K.S., Heinz, U., Schnerdermann, E., (1990) Z. Phys., C48, p. 525Ornik, U., Weiner, R.M., (1991) Phys. Lett., B263, p. 503Davidson, N.J., (1991) Phys. Lett., B255, p. 105Davidson, N.J., (1991) Phys. Lett., B256, p. 554Von Oertzen, D.W., (1992) Phys. Lett., B274, p. 128Davidson, N.J., (1992) Z. Phys., C56, p. 319Cleymans, J., Satz, H., (1993) Z. Phys., C57, p. 135Abatzis, S., (1994) Nucl. Phys., A566, pp. 225cBartke, J., (1990) Z. Phys., C48, p. 191Letessier, J., Tounsi, A., Rafelski, J., (1992) Phys. Lett, B292, p. 417Sollfrank, J., (1994) Z. Phys., C61, p. 659To be published, quoted in [20] and [21]Letessier, J., (1993) Phys. Rev. Lett., 70, p. 3530Letessier, J., (1995) Phys. Rev., D51, p. 3408Grassi, F., Socolowski Jr., O., submittedRedlich, K., (1994) Nucl. Phys., A566, pp. 391cAbatzis, S., (1990) Phys. Lett., B244, p. 130(1991) Phys. Lett., B259, p. 508(1991) Phys. Lett., B270, p. 123Rafelski, J., (1991) Phys. Lett., B262, p. 333Cleymans, J., (1986) Z. Phys., C33, p. 151Cleymans, J., (1990) Phys. Lett., B242, p. 111Cleymans, J., (1992) Z. Phys., C55, p. 317Rischke, D.H., (1991) Z. Phys., C51, p. 485Cleymans, J., (1993) Phys. Sc., 48, p. 277Menezes, D.P., (1993) Phys. Rev., C47, p. 2635Abatzis, S., (1993) Phys. Lett., B316, p. 615(1995) Phys. Lett., 347, p. 158(1996) Phys. Lett., 376, p. 251(1995) Phys. Lett., 355, p. 401Abatzis, S., (1995) Phys. Lett., B354, p. 178Bravinha, L.V., (1995) Phys. Lett., B354, p. 196Sorge, H., (1996) Phys. Lett., B373, p. 16Bilić, N., (1993) Phys. Lett., B311, p. 266Bilić, N., (1994) Z. Phys., C63, p. 525Csörgo, T., Csernai, L.P., (1994) Phys. Lett., B333, p. 49