EVIDENCE FOR DIFFERENT FREEZE-OUT RADII OF HIGH-AND LOW-ENERGY PIONS EMITTED IN AU-CENTER-DOT-GEV(AU COLLISIONS AT 1 A)

Authors
WAGNER A MUNTZ C OESCHLER H STURM C BARTH R CIESLAK M DCEBOWSKI M GROSSE E KOCZON P MANG M MISKOWIEC D SCHICKER R SCHWAB E SENGER P BECKERLE P BRILL D SHIN Y STROBELE H WALUS W KOHLMEYER B PUHLHOFER F SPEER J VOLKEL K
Citation
A. Wagner et al., EVIDENCE FOR DIFFERENT FREEZE-OUT RADII OF HIGH-AND LOW-ENERGY PIONS EMITTED IN AU-CENTER-DOT-GEV(AU COLLISIONS AT 1 A), Physics letters. Section B, 420(1-2), 1998, pp. 20-24
Citations number
27
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
420
Issue
1-2
Year of publication
1998
Pages
20 - 24
Database
ISI
SICI code
0370-2693(1998)420:1-2<20:EFDFRO>2.0.ZU;2-V
Abstract
Double differential production cross sections of pi(-) and pi(+) meson s and the number of participating protons have been measured in centra l Au + Au collisions at 1 A . GeV. At low pion energies the pi(-) yiel d is strongly enhanced over the pi(+) yield. The energy dependence of the pi(-)/pi(+) ratio is assigned to the Coulomb interaction of the ch arged pions with the protons in the reaction zone. The deduced Coulomb potential increases with increasing pion c.m. energy. This behavior i ndicates different freeze-out radii for different pion energies in the c.m. frame. (C) 1998 Elsevier Science B.V.