使用KTeV数据搜索Klong到pi0 pi0 mu+ mu
Search for Klong to pi0 pi0 mu+ mu- with KTeV Data
摘要：
本报告报告的第一个实验搜索的衰变Klong $π^0 π^0 μ^+ μ^-$的基础上收集的数据由KTeV实验。虽然这种衰减模式在标准模型中是可能的，但其速率是相空间抑制的。HyperCP实验最近在一个狭窄的双μ子质量范围内观察到3个$Σ^+ \to p μ^+ μ^-$事件，表明该过程可能通过一个新的中性状态发生：$Σ^+ \to p X^0, X^0 \toμ^+ μ^-$与$m(X^0) = 214.3\mev$。$X^0$将产生一个$s$ -到$d$ -的夸克跃迁，其速率将导致Klong到$π^0 π^0 X, ^0 \toμ^+ μ^-$的跃迁速率大大超过标准模型的预期。我们的初步结果大大限制了这种可能性。
英文摘要：
This presentation reports on the first experimental search for the decay Klong to $π^0 π^0 μ^+ μ^-$ based on data collected by the KTeV experiment. Although this decay mode is possible within the standard model, its rate is phase space suppressed. The HyperCP experiment has recently observed 3 $Σ^+ \to p μ^+ μ^-$ events within a narrow di-muon mass range, suggesting that the process may occur via a new neutral state: $Σ^+ \to p X^0, X^0 \toμ^+ μ^-$ with $m(X^0) = 214.3\mev$. The $X^0$ would create an $s$- to $d$- quark transition at a rate that would cause Klong to $π^0 π^0 X, ^0 \toμ^+ μ^-$ to occur at rates considerably over the standard model expectation. Our preliminary results significantly constrain this possibility.
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