Production of the f 0(980) resonance in the reaction π − p → π 0 π 0 n

Abstract

Predictions of the model that relies on purely one-pion exchange and which describes well GAMS data on the rearrangement of the S-wave mass spectrum of the π0π0 system in the region of the f0(980) resonance with increasing −t in the reaction π−p → π0π0n are compared with detailed data that were recently obtained at the Brookhaven National Laboratory (BNL) for the m and t distributions of the number of events of the reaction π−p → π0π0n. An analysis revealed that these BNL data disagree with the predictions of this model. This suggests that a different mechanism must be responsible for the phenomenon discovered experimentally. Most likely, this is the a1-exchange mechanism.