Bose-Einstein condensation of pions in ultrarelativistic nucleus-nucleus collisions and the spectra of kaons

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Physics of Atomic Nuclei

OSTI ID:283089

Kolomeitsev, E E ^[1]; Voskresensky, D N ^[2]

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1. Institute fuer Kern und Hadronenphysik, Dresden (Germany)
2. Moscow Engineering Physics Institute (Technical Univ.), Moscow (Russian Federation)

The properties of a pion gas that is formed in ultrarelativistic collisions of nuclei are studied in the Weinberg, model for {pi}{pi} interaction. The possible Bose-Einstein condensation of a dense n-gas is considered. The Green`s function and the spectrum of the overcondensate excitations are calculated. For a weak condensate, the results coincide with those obtained in the {lambda}{var_phi}{sup 4} model ({lambda} = const), while for a developed condensate there are significant differences. The properties of kaons are considered for temperatures below the critical temperature for Bose-Einstein pion condensation. It is shown that, in the presence of a condensate, the K-effective mass becomes substantially larger, while the K{sup +} effective mass becomes smaller. These features may manifest themselves in the observable momentum distributions of kaons. 16 refs., 4 figs.

• OSTI ID: 283089
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 12 Vol. 58; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BOSE-EINSTEIN CONDENSATION
HEAVY ION REACTIONS
KAONS
PION-PION INTERACTIONS
PIONS
RELATIVISTIC RANGE