Ja n 19 99 Scaling Properties of Pion Production

Ja n 19 99 Scaling properties of transverse flow in Bjorken ’ s scenario for heavy ion collisions

We report a simple analytic solution for the velocity u of the transverse flow of QGP at a hadronization front in Bjorken’s scenario. We establish scaling properties of the transverse flow as a function of the expansion time. We present simple scaling formula for the expansion velocity distribution.

ar X iv : n uc l - th / 9 90 10 97 v 2 3 0 Ja n 19 99 1 The Landau - Migdal Parameters , g ′ NN and g ′ N ∆ and Pion

ar X iv : n uc l - th / 9 90 10 54 v 1 1 9 Ja n 19 99 KVI

The chiral two-pion exchange component of the long-range pp interaction is studied in an energy-dependent partial-wave analysis. We demonstrate its presence and importance, and determine the chiral parameters c i (i = 1, 3, 4). The values agree well with those obtained from pion-nucleon amplitudes.

Ja n 19 99 Large Deviation Function of the Partially Asymmetric Exclusion Process

The large deviation function obtained recently by Derrida and Lebowitz for the totally asymmetric exclusion process is generalized to the partially asymmetric case in the scaling limit. The asymmetry parameter rescales the scaling variable in a simple way. The finite-size corrections to the universal scaling function and the universal cumulant ratio are also obtained to the leading order.

Fe b 19 99 In - medium modification of the ∆ ( 1232 ) resonance at SIS energies ∗

From the pion production rates n π /A part and the pion charge ratios R π = n π − /n π + and S π = n π 0 /(n π − + n π +), measured in p + a and A + A reactions, it is concluded that the mass of the ∆(1232) resonance is reduced in dense nuclear matter. This conclusion is supported by the ∆(1232) mass distribution extracted from correlated (p,π ±) pairs and the π ± transverse momentum distributi...