# V Workshop on Particle Correlations and Femtoscopy

14-17 October 2009
CERN
Europe/Zurich timezone

## The meaning of the time scale ∆t in Bose−Einstein correlations

16 Oct 2009, 15:30
30m
TH Auditorium (CERN)

### TH Auditorium

#### CERN

Talk Correlations from Small Sources: Theory & Experiment

### Speaker

Prof. Gideon Alexander (Tel-Aviv University)

### Description

The time scale ∆t parameter, which appears in the Bose-Einstein Correlations (BEC) and treated in term of the Heisenberg uncertainty relations, is reexamined. Arguments are given for the role of ∆t as a measure of the particles’ emission time rather than representing the strength property of the correlated particles. In heavy ion collisions ∆t measures the emission time duration of the particles produced from a nucleus of atomic number A which is shown to be $\Delta t = \frac{m_{\pi}\alpha^2}{hc^2}A^{2/3}$ where a ≃1 fm that is, proportional to the nucleus surface area. This ﬁnding agrees rather well with the experimental ∆t values deduced from the BEC analyzes of heavy ion collisions.

### Primary authors

Erez Reinherz-Aronis (Tel-Aviv University) Prof. Gideon Alexander (Tel-Aviv University)

### Presentation Materials

 Gideon-WPCF2009t.pdf Gideon-WPCF2009t.ppt