Abstract
We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.
Original language | English |
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Pages (from-to) | 93-98 |
Number of pages | 6 |
Journal | Physics Letters B |
Volume | 351 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 1995 May 25 |
Externally published | Yes |
ASJC Scopus subject areas
- Nuclear and High Energy Physics