MEASUREMENT OF PION ENHANCEMENT AT LOW TRANSVERSE-MOMENTUM AND OF THEDELTA-RESONANCE ABUNDANCE IN SI-NUCLEUS COLLISIONS AT AGS ENERGY

Authors
BARRETTE J BELLWIED R BRAUNMUNZINGER P CLELAND WE CORMIER TM DAVID G DEE J DIEBOLD GE DIETZSCH O GERMANI JV GILBERT S GREENE SV HALL JR HEMMICK TK HERRMANN N HONG B JAYANANDA K KRAUS D KUMAR BS LACASSE R LISSAUER D LLOPE WJ LUDLAM TW MCCORKLE S MAJKA R MARK SK MITCHELL JT MUTHUSWAMY M OBRIEN E PRUNEAU C RAO MN ROTONDO F DASILVA NC SONNADARA U STACHEL J TAKAI H TAKAGUI EM THROWE TG WANG G WOLFE D WOODY CL XU N ZHANG Y ZHANG Z ZOU C
Citation
J. Barrette et al., MEASUREMENT OF PION ENHANCEMENT AT LOW TRANSVERSE-MOMENTUM AND OF THEDELTA-RESONANCE ABUNDANCE IN SI-NUCLEUS COLLISIONS AT AGS ENERGY, Physics letters. Section B, 351(1-3), 1995, pp. 93-98
Citations number
24
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
351
Issue
1-3
Year of publication
1995
Pages
93 - 98
Database
ISI
SICI code
0370-2693(1995)351:1-3<93:MOPEAL>2.0.ZU;2-T
Abstract
We present measurements of pion transverse momentum (p(t)) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for p(t) down to and including p(t) = 0. The data exhibit an enhanced pion yield at low, p(t) compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Delta resona nce abundance at freeze-out. The results are consistent with a direct measurement of the Delta resonance yield by reconstruction of proton-p ion pairs and imply a temperature of the system at freeze-out close to 140 MeV.