Summary
With the Crystal Barrel detector, the final state π−π0π0pS at rest in liquid deuterium was measured for the first time. A preliminary partial-wave analysis was performed, which required two interesting features: besides the ρ(770), a second pole was needed in the ππP-wave and a narrow resonance in the ππS-wave, slightly above 1500 MeV/c2. With the same parametrization a high-statistics π+π−π0 data set could also be well described.
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Crystal Barrel Collaboration., Amsler, C., Augustin, I. et al. Antiproton annihilation at rest in liquid deuterium into π−π0π0pS . Nuov Cim A 107, 2339–2344 (1994). https://doi.org/10.1007/BF02734000
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DOI: https://doi.org/10.1007/BF02734000