怎样才算“探测到了”

来自Nature

粒子物理学家的标准很严格:5个\sigma才算探测到。但以后新发现可能将会从不那么显著的信号得出。

CDF声称在4.2个\sigma探测到了新粒子,但D0却没有探测到。

T2K中微子实验,试图检验\mu子中微子与电子中微子的转变。这个与CP对称性被违反的程度有关。目前探测到6个事件,而背景噪声是1.5个。

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