Study of the performance of electro-magnetic calorimeter for the rare neutral kaon decay.

这项研究的动机是通过世界上第一次测量非常罕见的衰变K→π0νν-来寻找超越标准模型的新物理。实验是在J-PARC的高强度质子束上进行的。我们构建了一个以CsI晶体为主探测器的电磁量热计，并用束流对其性能进行了评估。由于日本东部的大地震，实验推迟了大约一年，但我们已经开始积累物理数据。

The motivation of this research is to search for new physics beyond the standard model by the world's first measurement of the very rare decay, K→π0νν-. The experiment has been performed by high intensity proton beam at J-PARC. We constructed an electro-magnetic calorimeter composed of the CsI crystal as a main detector and evaluated the performance using the beams. The experiment is delayed about 1 year due to the Grate East Japan Earthquake, however, we have started to accumulate the physics data.