ππ Production in proton-proton collisions at T=1.4 GeV
Abstract
The reaction pp→ppππ has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. The total cross section is found to be (324±21±58) μb. In order to study the production mechanism, differential kinematic distributions have been evaluated. The differential distributions indicate that both initial state protons are excited into intermediate Δ(1232) resonances, each decaying into a proton and a single pion, thereby producing the pion pair in the final state. No significant contribution of the Roper resonance N(1440) via its decay into a proton and two pions is found.
- Publication:
-
Physics Letters B
- Pub Date:
- January 2012
- DOI:
- 10.1016/j.physletb.2011.11.041
- Bibcode:
- 2012PhLB..706..256W