Coherent production of the p π+π− enhancement at 1470 MeV by 28 GeV/c protons on neon

• Published in: Nuclear physics. B 1968-12, Vol.8 (2), p.391-401
• Main Authors: Huson, F.R., Miller, D.J., O'Neall, J.S.
• Format: Article
• Language: English
• ISSN: 0550-3213; 1873-1562
• DOI: 10.1016/0550-3213(68)90251-4

In a bubble-chamber experiment with 28 GeV/ c protons in a neon-hydrogen mixture, coherent production of p π + π − on neon has been observed. All of the available evidence indicates that the enhancement in p π + π − mass which we see in the region of 1470 MeV is the same as has been observed in high-energy pp experiments. A double-Regge model gives quite good agreement with the data, without needing any explicit resonance production. Calculations with a nuclear absorption model have given limits of between 30 mb and 70 mb for the emerging p π + π − system with mass less than 1.6 GeV. The cross section for coherent production of p π + π − in this mass range is found to be 470 ± 100 μb.