Two-Pion Production in Nucleon-Nucleon Collisions and the ABC-Effect - Approaching a Puzzleby exclusive and Kinematically complete Measurements

T. Skorodko, M. Bashkanov, C. Bargholtz +50

The ABC effect - a puzzling low-mass enhancement in the $\pi \pi$ invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear collisions, where it a…