Prepared for submission to SPSC NA 64 Status Report 2017

D. Banerjee, V. Burtsev, D. Cooke, P. Crivelli, E. Depero, A. V. Dermenev,S. V. Donskov, F. Dubinin, R. R. Dusaev, S. Emmenegger, A. Fabich, V. N. Frolov, A. Gardikiotis,S. N. Gninenko, M. Hösgen, A. E. Karneyeu, B. Ketzer, D. V. Kirpichnikov, M. M. Kirsanov, S. G. Kovalenko, V. A. Kramarenko,L. V. Kravchuk, N. V. Krasnikov,S. V. Kuleshov,V. E. Lyubovitskij, V. Lysan,V. A. Matveev,Yu. V. Mikhailov,D. V. Peshekhonov,V. A. Polyakov, B. Radics, A. Rubbia,V. D. Samoylenko, V. O. Tikhomirov, D. A. Tlisov, A. N. Toropin, A. Yu. Trifonov, B. Vasilishin, G. Vasquez Arenas, P. Ulloa, K. Zhukov, K. Zioutas

semanticscholar（2017）

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摘要

The experiment NA64 is aimed at a direct search for invisible decays of sub-GeV dark photons (A′). The main goal in 2016 was to probe a region of the A′ parameter space, particularly interesting for the explanation of the muon gμ − 2 anomaly. The status and results from two NA64 runs in July and October 2016, obtained, respectively, with 2.75×10 and 4×10 accumulated electron on target are reported. A feasibility study of the search for the X → e+e− decay of a new light X boson, which could explain a recently observed excess of e+e− events from excited Be transitions is also presented.

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