Antihelium-3 production in lead-lead collisions at 158 A GeV/c
The NA52 experiment measured particle and antiparticle yields at 0° production angle over a wide range in rapidity in lead-lead (Pb-Pb) collisions at 158 A GeV/c with a minimum bias trigger. Besides Script O(106) antiprotons (bar-p) and Script O(103) antideuterons (bar-d) a total of five antihelium-3 (overline-3He) were found. The resulting invariant differential overline-3He production cross sections at ptsimeq0 GeV/c turn out to be E (d3sigma)/(dp3) = (2.5 ± 1.8) × 10-7 bc3 GeV-2 at a rapidity of y = 3.4 in the laboratory system and (5.9 ± 3.4) × 10-8 bc3 GeV-2 at y = 4.0. The results are discussed in the framework of a simple coalescence model.
New Journal of Physics
- Pub Date:
- January 2003