Back-Anti counter at the E391a experiment
نویسنده
چکیده
We have searched for a light pseudoscaler particle “X(214)” which is suggested by HyperCP experiment in the K0 L → π0π0X(X → μ+μ−) decay process using the E391a detector at KEK. In our analysis, signal event “X(214)” has not observed with the 3.58 × 109 K0 L decays, and we set an upper limit for the branching fraction of K0 L → π0π0X(X → μ+μ−) to be 1.6 × 10−6 at the 90% confidence level. Also we have examined K0 L → π0π0μ+μ− 4-body process. We set an upper limit for the branching fraction of K0 L → π0π0μ+μ− to be 9.3 × 10−7.
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