Pion pair production in γ- γ collisions at low energy and the born cross section
Abstract
It is shown that (i) there is a severe constraint on σ( γγ→ π+π-/ σBorn imposed by phenomenological theory and (ii) the low-mass π +π - enhancement observed in the reaction γγ→ π+π- comes from interference between the Born term and the correction term.
- Publication:
-
Physics Letters B
- Pub Date:
- March 1988
- DOI:
- 10.1016/0370-2693(88)90558-8
- Bibcode:
- 1988PhLB..203..305M