2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

Status of the KL->pi0nunu Experiment at J-PARC

5 Jul 2014, 09:45
Sala 3+4 ()

Sala 3+4

Oral presentation Flavour Physics Flavour Physics


Dr. Tadashi Nomura (KEK)


J-PARC-E14/KOTO experiment aims at observation of the rare decay KL->pi0nunu using a neutral kaon beam in the Hadron experimental hall at J-PARC. This mode occurs through a flavor-changing neutral current and violates CP symmetry. The branching ratio is calculated in the Standard Model (SM) to be 2.4x10^(-11). Since the theoretical uncertainty is small (~2%), this can be a good probe to explore new physics beyond the SM. KOTO completed the first stage of the detector construction in 2012, performed commissioning runs in early 2013, and finally started the first physics run in May 2013. We took data for about 100 hours with the 24kW beam power, which roughly corresponds to 1/5 of the originally expected amount to reach the Grossman-Nir limit sensitivity of 1.5x10^(-9). We are now analyzing the data, expecting to update the current experimental upper limit of 2.6x10^(-8). In this contribution, the status of the KOTO experiment, including data analysis and prospects, will be reported.

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