# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
Europe/Zurich timezone

## Fermion pair production in space-time dependent strong fields

20 May 2014, 16:30
2h

### spectrum

Board: L-01
Poster New Theoretical Developments

### Speaker

Daniel Berenyi (Wigner RCP of the Hungarian Academy of Sciences, Hungary)

### Description

In the early stage of relativistic heavy ion collisions a strong coherent gluonic field could form. This phenomenon is usually described by the string model and it became the basis of successful Monte Carlo event generators. The usual string picture can be connected to an assumption of a static homogeneous gluonic field. On the other hand during the collision one expects large inhomogeneities of the gluonic field in space-time. With the help of the relativistic Wigner function formalism one can describe the phase-space evolution of pair production in such fields. Our model of fermion-pair production indicates that not only the time variation plays an important role and has strong influence on the transverse momentum spectra of the newly produced particles, but the space inhomogeneities could completely change the interpretation of the string picture. As a result we demonstrate that most of the new particles are not produced in the bulk, scaling with the volume, instead one finds a scaling with $\propto V ^{\frac{2}{3}}$, in accordance with the early prediction of Heisenberg.

### Primary author

Daniel Berenyi (Wigner RCP of the Hungarian Academy of Sciences, Hungary)

### Co-authors

Peter Levai (Wigner RCP of the Hungarian Academy of Sciences, Hungary) Sandor Varro (Wigner RCP of the Hungarian Academy of Sciences, Hungary) Vladimir Skokov (Department of Physics, Western Michigan University, USA)

 Poster