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10-15 August 2015
Centro Brasileiro de Pesquisas Físicas
Brazil/East timezone

Revisiting T2KK and T2KO physics potential and nu_mu - anti-nu_mu beam ratio

Not scheduled
Ministro João Alberto Lins de Barros auditorium (Centro Brasileiro de Pesquisas Físicas)

Ministro João Alberto Lins de Barros auditorium

Centro Brasileiro de Pesquisas Físicas

Rua Dr. Xavier Sigaud 150 Urca - Rio de Janeiro - RJ BRAZIL
Poster Working group 1: Neutrino Oscillation Physics


Dr Yoshitaro Takaesu (University of Tokyo)


In this presentation, we revisit the sensitivity studies of a Tokai-to-Kamioka-and-Korea (T2KK) and Tokai-to-Kamioka-and-Oki (T2KO) proposals where a 100 kton detector is placed in Korea (L = 1000 km) and Oki island (L = 653 km) in Japan, respectively, in addition to the Super-Kamiokande (SK) for determination of the neutrino mass hierarchy and leptonic CP phase (δCP). We systematically study the nu_mu and anti-nu_mu focusing beam ratio with dedicated estimation of backgrounds for the nu_e appearance and nu_mu disappearance signals, especially improving treatment of the neutral current (NC) pi0 backgrounds. Using a nu_m : anti-nu_mu beam ratio between 3 : 2 and 2.5 : 2.5, the mass hierarchy determination with Delta_chi^2 = 10−30 by the T2KK and 3−20 by the T2KO experiment are expected for 5×10^21POT when sin(θ23)^2 = 0.5. The CP phase is measured with the uncertainty of 20 deg. − 50 deg. by the T2KK and T2KO using the nu_mu : anti-nu_mu focusing beam ratio between 3.5 : 1.5 and 1.5 : 3.5. These findings indicate that the T2KK and T2KO experiments can improve their sensitivity to both the mass hierarchy determination and leptonic CP phase measurement simultaneously, using nu_mu and anti-nu_mu focusing beams with 3 : 2 - 2.5 : 2.5 beam ratio.

Primary author

Dr Yoshitaro Takaesu (University of Tokyo)


Prof. Kaoru Hagiwara (KEK) Prof. Naotoshi Okamura (International University of Health and Welfare) Prof. Pyungwon Ko (KIAS)

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