Japan has a strong domestic programme based on the High Energy Accelerator Research Organization (KEK) and the Kamioka Laboratory, and is currently operating KEK-B, the BELLE experiment, the J-PARC facility for nuclear and particle physics and the T2K long-baseline neutrino experiment. Japan made an important contribution to the OPAL experiment at LEP, as well as to CHORUS and the AD facility. Japan made a very important financial and technical contribution to the LHC accelerator, as well as to ATLAS via KEK, Tokyo and other universities. Japanese institutions have also joined ALICE and LHCf. Japan is a special Observer State, with the right to attend restricted Council sessions for discussions of LHC matters.

Japan contributed to the material costs of Phase 1 of the WLCG at CERN and is now contributing to deployment of the WLCG with a Tier-2 centre. Japan is also a key contributor to the OPERA experiment, principally via Nagoya University, and to the ASACUSAand ALPHA experiments at the AD, and also participates in fixed-target experiments. Japan also collaborates to the COMPASSDIRAC, MERIT, NA61 and nTOFexperiments. Japan is one of the  principal proponents of a future linear collider, and is also making a valuable contribution to CLIC R&D, where KEK has important relevant expertise.

CERN and KEK signed a framework agreement in 2009 and a CERN-KEK Committee was set up to advise the two laboratories on their future collaboration, including contributions to R&D on LHC upgrades.

CERN contact(s): E. Tsesmelis

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