Observations of the D and E mesons and possible three-kaon enhancements in pi-p→K0K±pi±X,K0K+K-X at 50 and 100 GeV/c

Creators: Bromberg, C.; Dickey, J. O.; Fox, G.; Gomez, R.; Kropac, W.; Pine, J.; Stampke, S. R.; Haggerty, H.; Malamud, E.; Abrams, R.; Delzenero, R.; Goldberg, H.; Lopez, F.; Margulies, S.; McLeod, D.; Solomon, J.; Dzierba, A.; Fredericksen, F.; Heinz, R.; Krider, J.; Martin, H.; Petersen, D.

Abstract

We present results from the study of multikaon final states in the reactions π-p→K0K±π∓X̃, K0K+K-X̃ at 50 and 100 GeV/c. Here X̃ is semi-inclusive, that is, a specific forward topology and an interaction registering in the counters surrounding the target are required. The D(1285) meson is seen in the δπ mode, while the E(1420) meson is observed in both the δπ and the K*K modes. In addition, there are two possible enhancements in the three-kaon final state. The first (M∼1840 MeV) is associated with the K0φ mode and is consistent with being the charmed D0. The second, a K* state (M=2003±14 MeV, Γ=87±43 MeV), decays into KA2.

Additional Information

©1980 The American Physical Society. Received 14 April 1980. We would like to thank F. J. Nagy for furnishing the resonance plus background fitting routines and for valuable discussions concerning their use. We also thank P. Schlein for providing the Čerenkov counters used in this experiment. This work was supported in part by the U.S. Department of Energy under Contracts Nos. DE-AC-03-79-79ER 0068 (Caltech) and DE-AS02-76-EY-02009 (Indiana), and the National Science Foundation under Grant No. PHY-78-07452 (Illinois).

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