Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-04-02
Nucl.Phys. A590 (1995) 465c-468c
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, no figures, ReVTeX, uses espcrc1.sty, Quark Matter'95 conference, Nucl. Phys. A in press
Scientific paper
10.1016/0375-9474(95)00255-Y
There are two length-scales present simultaneously in all the principal directions for three-dimensionally expanding, finite systems. These are discussed in detail for the case of a longitudinally expanding system with a transverse flow and a transverse temperature profile. For systems with large geometrical sizes we find an $m_t$-scaling for the parameters of the Bose-Einstein correlation function, which may be valid in the whole transverse mass region for certain model parameters. In this limit, the Bose-Einstein correlations view only a small part of the source. The large geometrical sizes can be inferred from a simultaneous analysis of the invariant momentum distribution and the Bose-Einstein correlation function. A preliminary analysis of the NA44 data indicates that instead of a small fireball we are observing a big and expanding snowball in $S + Pb $ reactions at CERN SPS energies.
Csorgo Tamas
Lörstad Bengt
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