# V Workshop on Particle Correlations and Femtoscopy

14-17 October 2009
CERN
Europe/Zurich timezone

15 Oct 2009, 16:20
30m
TH Auditorium (CERN)

### TH Auditorium

#### CERN

Talk Squeezed States and Particle-Antiparticle Back-to-Back Correlation

### Description

Squeezed correlations of particle-antiparticle pairs are predicted to appear in case the masses of those particles are modified in the hot and dense medium formed in high energy heavy ion collisions. If discovered experimentally, they would be an unequivocal evidence of such modification by means of hadronic probes. Previous studies have shown that, for a uniformly distributed, momentum-independent shift in the hadronic masses, the particle-antiparticle squeezed correlations were expected to lead to sizable signals. We briefly recall those results here, for $K^+ K^-$ and of $\phi \phi$ pairs, with in-medium reduced masses. Next, we discuss results of squeezing effects on particle-antiparticle correlations of $D$-mesons, whose detection and identification are expected to be more easily performed in future upgrades of experiments at the BNL/RHIC accelerator. The suggested observable to be searched for is the squeezed correlation function of D-meson pairs, plotted in terms of their average momentum, $K_{_{12}}=\frac{1}{2} (k_{_1} + k_{_2})$, for large values of their relative momentum, $q_{_{12}}=(k_{_1} - k_{_2})$. We show also for this case that the effects of squeezing on particle-antiparticle correlations survive finite size and flow effects, with enough strength to be observed experimentally. We investigate the dependence of the maximum of the squeezed correlation on the asymptotic particle mass, as well as on their emission temperatures.

### Co-authors

Ms Danuce Dudek (Instituto de Fisica Teorica (IFT)-Universidade Estadual Paulista, Brazil) Dr Otavio Socolowski Jr. (IMEF - FURG, Brazil)

 Slides