ar X iv : h ep - p h / 03 02 08 5 v 2 1 7 Fe b 20 03 The universal ln 2 s increase in total cross sections

ar X iv : h ep - p h / 03 02 08 5 v 1 1 2 Fe b 20 03 The universal ln 2 s increase in total cross sections

While it has long been known that many models of high energy scattering give cross sections which rise as ln s, the determination of the coefficient of this term is rarely given. We show that in gaussian and exponential eikonal models an exact expression for the cross section can be obtained, which demonstrates the ln s asyptoptic behaviour and determines its coefficient. The coefficient is uni...

ar X iv : h ep - p h / 02 06 21 4 v 1 2 1 Ju n 20 02 Heisenberg ’ s universal ln 2 s increase of total cross sections

The ln 2 s behaviour of total cross sections, first obtained by Heisenberg 50 years ago, receives now increased interest both on phenomenological and theoretical levels. In this paper we present a modification of the Heisenberg's model in connection with the presence of glueballs and we show that it leads to a realistic description of all existing hadron total cross-sections data.

ar X iv : h ep - p h / 02 06 21 4 v 2 1 6 Se p 20 02 Heisenberg ’ s universal ln 2 s increase of total cross sections

The ln 2 s behaviour of total cross sections, first obtained by Heisenberg 50 years ago, receives now increased interest both on phenomenological and theoretical levels. In this paper we present a modification of the Heisenberg's model in connection with the presence of glueballs and we show that it leads to a realistic description of all existing hadron total cross-sections data.

ar X iv : h ep - p h / 03 02 12 9 v 1 1 7 Fe b 20 03 Scalar σ meson effects in radiative ρ 0 - meson decays

ar X iv : h ep - p h / 03 02 18 5 v 1 2 0 Fe b 20 03 Nonlinear corrections to the DGLAP equations ; looking for the saturation limits ∗

The effects of the first nonlinear corrections to the DGLAP equations are studied in light of the HERA data. Saturation limits are determined in the DGLAP+GLRMQ approach for the free proton and for the Pb nucleus.