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Title: Measurement of the muon beam direction and muon flux for the T(2)K neutrino experiment
Authors: Suzuki, K.
Aoki, S.
Ariga, A.
Ariga, T.
Bay, F.
Bronner, C.
Ereditato, A.
Friend, M.
Hartz, M.
Hiraki, T.
Ichikawa, A. K.
Ishida, T.
Ishii, T.
Juget, F.
Kikawa, T.
Kobayashi, T.
Kubo, H.
Matsuoka, K.
Maruyama, T.
Minamino, A.
Murakami, A.
Nakadaira, T.
Nakaya, T.
Nakayoshi, K.
Otani, M.
Oyama, Y.
Patel, N.
Pistillo, C.
Sakashita, K.
Sekiguchi, T.
Suzuki, S. Y.
Tada, S.
Yamada, Y.
Yamamoto, K.
Yokoyama, M.
Author's alias: 鈴木, 研人
Keywords: C32
Issue Date: 1-May-2015
Publisher: Oxford University Press
Journal title: Progress of Theoretical and Experimental Physics
Volume: 2015
Issue: 5
Thesis number: 53C01
Abstract: The Tokai-to-Kamioka (T2K) neutrino experiment measures neutrino oscillations by using an almost pure muon neutrino beam produced at the J-PARC accelerator facility. The T[2]K muon monitor was installed to measure the direction and stability of the muon beam which is produced in conjunction with the muon neutrino beam. The systematic error in the muon beam direction measurement was estimated, using data and MC simulation, to be 0.28 mrad. During beam operation, the proton beam has been controlled using measurements from the muon monitor and the direction of the neutrino beam has been tuned to within 0.3 mrad with respect to the designed beam-axis. In order to understand the muon beam properties, measurement of the absolute muon yield at the muon monitor was conducted with an emulsion detector. The number of muon tracks was measured to be (4.06±0.05±0.10)×10[4]cm[−2] normalized with 4×10[11] protons on target with 250 kA horn operation. The result is in agreement with the prediction, which is corrected based on hadron production data.
Rights: © The Author(s) 2015. Published by Oxford University Press on behalf of the Physical Society of Japan.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI(Published Version): 10.1093/ptep/ptv054
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