出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The neutral-kaon decay KL is a direct CP-violating process caused by a flavorchanging neutral current, and the branching ratio is predicted to be (2.49±0.39)×10-11 in the Standard Model. The rare decay is one of the processes expected to have a significant impact on new physics searches. The J-PARC E14 KOTO experiment aims at the first observation of the rare decay KL using the upgraded detector from the KEK-E391a experiment and an intense KL beam at J-PARC. The new dedicated KL beam line for the KOTO experiment was constructed in 2009 and the first KL beam was successfully extracted from October 2009 to February 2010. The construction of the KOTO detector with many upgrades was started in 2009. In this contribution, the current status of the KOTO experiment is reported.
