\(\bar pp\) Annihilation at rest into KL0KS0π0π0Annihilation at rest into KL0KS0π0π0

Investigations of purely neutral final states in\(\bar pp\) annihilation are possible for the first time with the Crystal Barrel detector at LEAR. The high-mass resolution for π0-mesons allows the reconstruction of K S 0 -mesons in their neutral-pion decay. Moreover, non-interacting K L 0 -mesons can be well identified by the measurement of missing energy. Annihilation into the channel K L 0 K S 0 π0π0 proceeds predominantly via the following two-body intermediate states: K1(1400)K0, K1(1270)K0,\(K*\bar K*\),\(K*\bar K^0 \)which can be identified with the h′1 (1380)-meson.