Browsing by Author "Kim, C. O."

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    Evidence for muon neutrino oscillation in an accelerator-based experiment
    Aliu, E.; Andringa, S.; Aoki, S.; Argyriades, J.; Asakura, K.; Ashie, R.; Berns, H.; Bhang, H.; Blondel, A.; Borghi, S.; Bouchez, J.; Burguet-Castell, J.; Casper, D.; Cavata, C.; Cervera, A.; Cho, K. O.; Choi, J. H.; Dore, U.; Espinal, X.; Fechner, M.; Fernandez, E.; Fukuda, Y.; Gomez-Cadenas, J. J.; Gran, R.; Hara, T.; Hasegawa, M.; Hasegawa, T.; Hayashi, K.; Hayato, Y.; Helmer, R. L.; Hill, J.; Hiraide, K.; Hosaka, J.; Ichikawa, A. K.; Iinuma, M.; Ikeda, A.; Inagaki, T.; Ishida, T.; Ishihara, K.; Ishii, T.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jeon, E. J.; Jeong, I. S.; Joo, K. K.; Jover, G.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kato, I.; Kearns, E.; Kerr, D.; Kim, C. O.; Khabibullin, M.; Khotjantsev, A.; Kielczewska, D.; Kim, J. Y.; Kim, S.; Kitching, P.; Kobayashi, K.; Kobayashi, T.; Konaka, A.; Koshio, Y.; Kropp, W.; Kubota, J.; Kudenko, Y.; Kuno, Y.; Kutter, T.; Learned, J.; Likhoded, S.; Lim, I. T.; Loverre, P. F.; Ludovici, L.; Maesaka, H.; Mallet, J.; Mariani, Camillo; Maruyama, T.; Matsuno, S.; Matveev, V. A.; Mauger, C.; McConnel, K.; McGrew, C.; Mikheyev, S.; Minamino, A.; Mine, S.; Mineev, O.; Mitsuda, C.; Miura, M.; Moriguchi, Y.; Morita, T.; Moriyama, S.; Nakadaira, T.; Nakahata, M.; Nakamura, K.; Nakano, I.; Nakaya, T.; Nakayama, S.; Namba, T.; Nambu, R.; Nawang, S.; Nishikawa, K.; Nitta, K.; Nova, F.; Novella, P.; Obayashi, Y.; Okada, A.; Okumura, K.; Oser, S. M.; Oyama, Y.; Pac, M. Y.; Pierre, F.; Rodriguez, A.; Saji, C.; Sakuda, M.; Sanchez, F.; Sarrat, A.; Sasaki, T.; Scholberg, K.; Schroeter, R.; Sekiguchi, M.; Sharkey, E.; Shiozawa, M.; Shiraishi, K. K.; Sitjes, G.; Smy, M.; Sobel, H.; Stone, J.; Sulak, L.; Suzuki, A.; Suzuki, Y.; Takahashi, T.; Takenaga, Y.; Takeuchi, Y.; Taki, K.; Takubo, Y.; Tamura, N.; Tanaka, M.; Terri, R.; T'Jampens, S.; Tornero-Lopez, A.; Totsuka, Y.; Ueda, S.; Vagins, M. R.; Walter, C. W.; Wang, W.; Wilkes, R. J.; Yamada, S.; Yamamoto, S.; Yanagisawa, C.; Yershov, N.; Yokoyama, H.; Yokoyama, M.; Yoo, J.; Yoshida, M.; Zalipska, J. (American Physical Society, 2005-03-04)
    We present results for νμ oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced νμ beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy dependent disappearance of νμ, which we presume have oscillated to ντ. The probability that we would observe these results if there is no neutrino oscillation is 0.0050% (4.0σ).
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    Experimental study of the atmospheric neutrino backgrounds for p -> e(+)pi(0) searches in water Cherenkov detectors
    Mine, S.; Alcaraz-Aunion, J. L.; Andringa, S.; Aoki, S.; Argyriades, J.; Asakura, K.; Ashie, R.; Berghaus, F.; Berns, H.; Bhang, H.; Blondel, A.; Borghi, S.; Bouchez, J.; Burguet-Castell, J.; Casper, D.; Catala, J.; Cavata, C.; Cervera, A.; Chen, S. M.; Cho, K. O.; Choi, J. H.; Dore, U.; Espinal, X.; Fechner, M.; Fernandez, E.; Fujii, Y.; Fukuda, Y.; Gomez-Cadenas, J. J.; Gran, R.; Hara, T.; Hasegawa, M.; Hasegawa, T.; Hayato, Y.; Helmer, R. L.; Hiraide, K.; Hosaka, J.; Ichikawa, A. K.; Iinuma, M.; Ikeda, A.; Ishida, T.; Ishihara, K.; Ishii, T.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jeon, E. J.; Jeong, I. S.; Joo, K. K.; Jover, G.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kato, I.; Kearns, E.; Kim, C. O.; Khabibullin, M.; Khotjantsev, A.; Kielczewska, D.; Kim, J. Y.; Kim, S. B.; Kitching, P.; Kobayashi, K.; Kobayashi, T.; Konaka, A.; Koshio, Y.; Kropp, W.; Kudenko, Y.; Kuno, Y.; Kurimoto, Y.; Kutter, T.; Learned, J.; Likhoded, S.; Lim, I. T.; Loverre, P. F.; Ludovici, L.; Maesaka, H.; Mallet, J.; Mariani, Camillo; Matsuno, S.; Matveev, V. A.; McConnel, K.; McGrew, C.; Mikheyev, S.; Minamino, A.; Mineev, O.; Mitsuda, C.; Miura, M.; Moriguchi, Y.; Moriyama, S.; Nakadaira, T.; Nakahata, M.; Nakamura, K.; Nakano, I.; Nakaya, T.; Nakayama, S.; Namba, T.; Nambu, R.; Nawang, S.; Nishikawa, K.; Nitta, K.; Nova, F.; Novella, P.; Obayashi, Y.; Okada, A.; Okumura, K.; Oser, S. M.; Oyama, Y.; Pac, M. Y.; Pierre, F.; Rodriguez, A.; Saji, C.; Sakuda, M.; Sanchez, F.; Scholberg, K.; Schroeter, R.; Sekiguchi, M.; Shiozawa, M.; Shiraishi, K. K.; Sitjes, G.; Smy, M.; Sobel, H.; Sorel, M.; Stone, J.; Sulak, L.; Suzuki, A.; Suzuki, Y.; Tada, M.; Takahashi, T.; Takenaga, Y.; Takeuchi, Y.; Taki, K.; Takubo, Y.; Tamura, N.; Tanaka, M.; Terri, R.; T'Jampens, S.; Tornero-Lopez, A.; Totsuka, Y.; Vagins, M. R.; Whitehead, L.; Walter, C. W.; Wang, W.; Wilkes, R. J.; Yamada, S.; Yamada, Y.; Yamamoto, S.; Yanagisawa, C.; Yershov, N.; Yokoyama, H.; Yokoyama, M.; Yoo, J.; Yoshida, M.; Zalipska, J. (American Physical Society, 2008-02-01)
    The atmospheric neutrino background for proton decay via p → e+π0 in ring imaging water Cherenkov detectors is studied with an artificial accelerator neutrino beam for the first time. In total, 3.14×105 neutrino events corresponding to about 10 megaton-years of atmospheric neutrino interactions were collected by a 1,000 ton water Cherenkov detector (KT). The KT charged-current single p0 production data are well reproduced by simulation programs of neutrino and secondary hadronic interactions used in the Super–Kamiokande (SK) proton decay search. The obtained p → e+π0 background rate by the KT data for SK from the atmospheric neutrinos whose energies are below 3 GeV is 1.63 +0.42−0.33 (stat.) +0.45−0.51 (syst.) (megaton-year)−1. This result is also relevant to possible future, megaton-scale water Cherenkov detectors.
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    Improved search for nu(mu)->nu(e) oscillation in a long-baseline accelerator experiment
    Yamamoto, S.; Zalipska, J.; Aliu, E.; Andringa, S.; Aoki, S.; Argyriades, J.; Asakura, K.; Ashie, R.; Berghaus, F.; Berns, H.; Bhang, H.; Blondel, A.; Borghi, S.; Bouchez, J.; Burguet-Castell, J.; Casper, D.; Catala, J.; Cavata, C.; Cervera, A.; Chen, S. M.; Cho, K. O.; Choi, J. H.; Dore, U.; Espinal, X.; Fechner, M.; Fernandez, E.; Fukuda, Y.; Gomez-Cadenas, J. J.; Gran, R.; Hara, T.; Hasegawa, M.; Hasegawa, T.; Hayashi, K.; Hayato, Y.; Helmer, R. L.; Hiraide, K.; Hosaka, J.; Ichikawa, A. K.; Iinuma, M.; Ikeda, A.; Inagaki, T.; Ishida, T.; Ishihara, K.; Ishii, T.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jeon, E. J.; Jeong, I. S.; Joo, K. K.; Jover, G.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kato, I.; Kearns, E.; Kerr, D.; Kim, C. O.; Khabibullin, M.; Khotjantsev, A.; Kielczewska, D.; Kim, J. Y.; Kim, S. B.; Kitching, P.; Kobayashi, K.; Kobayashi, T.; Konaka, A.; Koshio, Y.; Kropp, W.; Kubota, J.; Kudenko, Y.; Kuno, Y.; Kurimoto, Y.; Kutter, T.; Learned, J.; Likhoded, S.; Lim, I. T.; Loverre, P. F.; Ludovici, L.; Maesaka, H.; Mallet, J.; Mariani, Camillo; Matsuno, S.; Matveev, V. A.; McConnel, K.; McGrew, C.; Mikheyev, S.; Minamino, A.; Mine, S.; Mineev, O.; Mitsuda, C.; Miura, M.; Moriguchi, Y.; Morita, T.; Moriyama, S.; Nakadaira, T.; Nakahata, M.; Nakamura, K.; Nakano, I.; Nakaya, T.; Nakayama, S.; Namba, T.; Nambu, R.; Nawang, S.; Nishikawa, K.; Nitta, K.; Nova, F.; Novella, P.; Obayashi, Y.; Okada, A.; Okumura, K.; Oser, S. M.; Oyama, Y.; Pac, M. Y.; Pierre, F.; Rodriguez, A.; Saji, C.; Sakuda, M.; Sanchez, F.; Sarrat, A.; Sasaki, T.; Sato, H.; Scholberg, K.; Schroeter, R.; Sekiguchi, M.; Shiozawa, M.; Shiraishi, K. K.; Sitjes, G.; Smy, M.; Sobel, H.; Sorel, M.; Stone, J.; Sulak, L.; Suzuki, A.; Suzuki, Y.; Takahashi, T.; Takenaga, Y.; Takeuchi, Y.; Taki, K.; Takubo, Y.; Tamura, N.; Tanaka, M.; Terri, R.; T'Jampens, S.; Tornero-Lopez, A.; Totsuka, Y.; Ueda, S.; Vagins, M. R.; Whitehead, L.; Walter, C. W.; Wang, W.; Wilkes, R. J.; Yamada, S.; Yanagisawa, C.; Yershov, N.; Yokoyama, H.; Yokoyama, M.; Yoo, J.; Yoshida, M. (American Physical Society, 2006-05-12)
    We performed an improved search for νμ → νe oscillation with the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment, using the full data sample of 9.2 × 1019 protons on target. No evidence for a νe appearance signal was found, and we set bounds on the νμ → νe oscillation parameters. At Δm2 = 2.8×10−3 eV2, the best fit value of the K2K νμ disappearance analysis, we set an upper limit of sin2 2Θμe < 0.13 at 90% confidence level.
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    Measurement of neutrino oscillation by the K2K experiment
    Ahn, M. H.; Aliu, E.; Andringa, S.; Aoki, S.; Aoyama, Y.; Argyriades, J.; Asakura, K.; Ashie, R.; Berghaus, F.; Berns, H. G.; Bhang, H.; Blondel, A.; Borghi, S.; Bouchez, J.; Boyd, S. C.; Burguet-Castell, J.; Casper, D.; Catala, J.; Cavata, C.; Cervera, A.; Chen, S. M.; Cho, K. O.; Choi, J. H.; Dore, U.; Echigo, S.; Espinal, X.; Fechner, M.; Fernandez, E.; Fujii, K.; Fujii, Y.; Fukuda, S.; Fukuda, Y.; Gomez-Cadenas, J. J.; Gran, R.; Hara, T.; Hasegawa, M.; Hasegawa, T.; Hayashi, K.; Hayato, Y.; Helmer, R. L.; Higuchi, I.; Hill, J.; Hiraide, K.; Hirose, E.; Hosaka, J.; Ichikawa, A. K.; Ieiri, M.; Iinuma, M.; Ikeda, A.; Inagaki, T.; Ishida, T.; Ishihara, K.; Ishii, H.; Ishii, T.; Ishino, H.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jang, J. S.; Jeon, E. J.; Jeong, I. S.; Joo, K. K.; Jover, G.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kang, B. H.; Kato, I.; Kato, Y.; Kearns, E.; Kerr, D.; Kim, C. O.; Khabibullin, M.; Khotjantsev, A.; Kielczewska, D.; Kim, B. J.; Kim, H. I.; Kim, J. H.; Kim, J. Y.; Kim, S. B.; Kitamura, M.; Kitching, P.; Kobayashi, K.; Kobayashi, T.; Kohama, M.; Konaka, A.; Koshio, Y.; Kropp, W.; Kubota, J.; Kudenko, Y.; Kume, G.; Kuno, Y.; Kurimoto, Y.; Kutter, T.; Learned, J.; Likhoded, S.; Lim, I. T.; Lim, S. H.; Loverre, P. F.; Ludovici, L.; Maesaka, H.; Mallet, J.; Mariani, Camillo; Martens, K.; Maruyama, T.; Matsuno, S.; Matveev, V. A.; Mauger, C.; Mahn, K. B. M.; McGrew, C.; Mikheyev, S.; Minakawa, M.; Minamino, A.; Mine, S.; Mineev, O.; Mitsuda, C.; Mitsuka, G.; Miura, M.; Moriguchi, Y.; Morita, T.; Moriyama, S.; Nakadaira, T.; Nakahata, M.; Nakamura, K.; Nakano, I.; Nakata, F.; Nakaya, T.; Nakayama, S.; Namba, T.; Nambu, R.; Nawang, S.; Nishikawa, K.; Nishino, H.; Nishiyama, S.; Nitta, K.; Noda, S.; Noumi, H.; Nova, F.; Novella, P.; Obayashi, Y.; Okada, A.; Okumura, K.; Okumura, M.; Onchi, M.; Ooyabu, T.; Oser, S. M.; Otaki, T.; Oyama, Y.; Pac, M. Y.; Park, H.; Pierre, F.; Rodriguez, A.; Saji, C.; Sakai, A.; Sakuda, M.; Sakurai, N.; Sanchez, F.; Sarrat, A.; Sasaki, T.; Sato, H.; Sato, K.; Scholberg, K.; Schroeter, R.; Sekiguchi, M.; Seo, E.; Sharkey, E.; Shima, A.; Shiozawa, M.; Shiraishi, K. K.; Sitjes, G.; Smy, M.; So, H.; Sobel, H.; Sorel, M.; Stone, J.; Sulak, L.; Suga, Y.; Suzuki, A.; Suzuki, Y.; Suzuki, Y.; Tada, M.; Takahashi, T.; Takasaki, M.; Takatsuki, M.; Takenaga, Y.; Takenaka, K.; Takeuchi, H.; Takeuchi, Y.; Taki, K.; Takubo, Y.; Tamura, N.; Tanaka, H.; Tanaka, K.; Tanaka, M.; Tanaka, Y.; Tashiro, K.; Terri, R.; T'Jampens, S.; Tornero-Lopez, A.; Toshito, T.; Totsuka, Y.; Ueda, S.; Vagins, M. R.; Whitehead, L.; Walter, C. W.; Wang, W.; Wilkes, R. J.; Yamada, S.; Yamada, Y.; Yamamoto, S.; Yamanoi, Y.; Yanagisawa, C.; Yershov, N.; Yokoyama, H.; Yokoyama, M.; Yoo, J.; Yoshida, M.; Zalipska, J. (American Physical Society, 2006-10-01)
    We present measurements of νμ disappearance in K2K, the KEK to Kamioka long-baseline neutrino oscillation experiment. One hundred and twelve beam-originated neutrino events are observed in the fiducial volume of Super-Kamiokande with an expectation of 158.1+9.2 events without oscillation. A distortion of the energy spectrum is also seen in 58 single-ring muon-like events with reconstructed energies. The probability that the observations are explained by the expectation for no neutrino oscillation is 0.0015% (4.3σ). In a two flavor oscillation scenario, the allowed Δm2 region at sin2 2θ = 1 is between 1.9 and 3.5 × 10−3 eV2 at the 90% C.L. with a best-fit value of 2.8 × 10−3 eV2.
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    Measurement of single charged pion production in the charged-current interactions of neutrinos in a 1.3 GeV wide band beam
    Rodriguez, A.; Whitehead, L.; Alcaraz-Aunion, J. L.; Andringa, S.; Aoki, S.; Argyriades, J.; Asakura, K.; Ashie, R.; Berghaus, F.; Berns, H.; Bhang, H.; Blondel, A.; Borghi, S.; Bouchez, J.; Burguet-Castell, J.; Casper, D.; Catala, J.; Cavata, C.; Cervera, A.; Chen, S. M.; Cho, K. O.; Choi, J. H.; Dore, U.; Espinal, X.; Fechner, M.; Fernandez, E.; Fujii, Y.; Fukuda, Y.; Gomez-Cadenas, J. J.; Gran, R.; Hara, T.; Hasegawa, M.; Hasegawa, T.; Hayato, Y.; Helmer, R. L.; Hiraide, K.; Hosaka, J.; Ichikawa, A. K.; Iinuma, M.; Ikeda, A.; Ishida, T.; Ishihara, K.; Ishii, T.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jeon, E. J.; Jeong, I. S.; Joo, K. K.; Jover, G.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kato, I.; Kearns, E.; Kim, C. O.; Khabibullin, M.; Khotjantsev, A.; Kielczewska, D.; Kim, J. Y.; Kim, S. B.; Kitching, P.; Kobayashi, K.; Kobayashi, T.; Konaka, A.; Koshio, Y.; Kropp, W.; Kudenko, Y.; Kuno, Y.; Kurimoto, Y.; Kutter, T.; Learned, J.; Likhoded, S.; Lim, I. T.; Loverre, P. F.; Ludovici, L.; Maesaka, H.; Mallet, J.; Mariani, Camillo; Matsuno, S.; Matveev, V. A.; McConnel, K.; McGrew, C.; Mikheyev, S.; Minamino, A.; Mine, S.; Mineev, O.; Mitsuda, C.; Miura, M.; Moriguchi, Y.; Moriyama, S.; Nakadaira, T.; Nakahata, M.; Nakamura, K.; Nakano, I.; Nakaya, T.; Nakayama, S.; Namba, T.; Nambu, R.; Nawang, S.; Nishikawa, K.; Nitta, K.; Nova, F.; Novella, P.; Obayashi, Y.; Okada, A.; Okumura, K.; Oser, S. M.; Oyama, Y.; Pac, M. Y.; Pierre, F.; Saji, C.; Sakuda, M.; Sanchez, F.; Scholberg, K.; Schroeter, R.; Sekiguchi, M.; Shiozawa, M.; Shiraishi, K. K.; Sitjes, G.; Smy, M.; Sobel, H.; Sorel, M.; Stone, J.; Sulak, L.; Suzuki, A.; Suzuki, Y.; Tada, M.; Takahashi, T.; Takenaga, Y.; Takeuchi, Y.; Taki, K.; Takubo, Y.; Tamura, N.; Tanaka, M.; Terri, R.; T'Jampens, S.; Tornero-Lopez, A.; Totsuka, Y.; Vagins, M. R.; Walter, C. W.; Wang, W.; Wilkes, R. J.; Yamada, S.; Yamada, Y.; Yamamoto, S.; Yanagisawa, C.; Yershov, N.; Yokoyama, H.; Yokoyama, M.; Yoo, J.; Yoshida, M.; Zalipska, J. (American Physical Society, 2008-08-01)
    Single charged pion production in charged-current muon neutrino interactions with carbon is studied using data collected in the K2K long-baseline neutrino experiment. The mean energy of the incident muon neutrinos is 1.3 GeV. The data used in this analysis are mainly from a fully active scintillator detector, SciBar. The cross section for single π+ production in the resonance region (W < 2 GeV/c2) relative to the charged-current quasi-elastic cross section is found to be 0.734 +0.140 −0.153. The energy-dependent cross section ratio is also measured. The results are consistent with a previous experiment and the prediction of our model.
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    Measurement of the quasielastic axial vector mass in neutrino interactions on oxygen
    Gran, R.; Jeon, E. J.; Aliu, E.; Andringa, S.; Aoki, S.; Argyriades, J.; Asakura, K.; Ashie, R.; Berghaus, F.; Berns, H.; Bhang, H.; Blondel, A.; Borghi, S.; Bouchez, J.; Burguet-Castell, J.; Casper, D.; Catala, J.; Cavata, C.; Cervera, A.; Chen, S. M.; Cho, K. O.; Choi, J. H.; Dore, U.; Espinal, X.; Fechner, M.; Fernandez, E.; Fukuda, Y.; Gomez-Cadenas, J. J.; Hara, T.; Hasegawa, M.; Hasegawa, T.; Hayashi, K.; Hayato, Y.; Helmer, R. L.; Hiraide, K.; Hosaka, J.; Ichikawa, A. K.; Iinuma, M.; Ikeda, A.; Inagaki, T.; Ishida, T.; Ishihara, K.; Ishii, T.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jeong, I. S.; Joo, K. K.; Jover, G.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kato, I.; Kearns, E.; Kerr, D.; Kim, C. O.; Khabibullin, M.; Khotjantsev, A.; Kielczewska, D.; Kim, J. Y.; Kim, S. B.; Kitching, P.; Kobayashi, K.; Kobayashi, T.; Konaka, A.; Koshio, Y.; Kropp, W.; Kubota, J.; Kudenko, Y.; Kuno, Y.; Kurimoto, Y.; Kutter, T.; Learned, J.; Likhoded, S.; Lim, I. T.; Loverre, P. F.; Ludovici, L.; Maesaka, H.; Mallet, J.; Mariani, Camillo; Matsuno, S.; Matveev, V. A.; Mahn, K. B. M.; McGrew, C.; Mikheyev, S.; Minamino, A.; Mine, S.; Mineev, O.; Mitsuda, C.; Miura, M.; Moriguchi, Y.; Morita, T.; Moriyama, S.; Nakadaira, T.; Nakahata, M.; Nakamura, K.; Nakano, I.; Nakaya, T.; Nakayama, S.; Namba, T.; Nambu, R.; Nawang, S.; Nishikawa, K.; Nitta, K.; Nova, F.; Novella, P.; Obayashi, Y.; Okada, A.; Okumura, K.; Oser, S. M.; Oyama, Y.; Pac, M. Y.; Pierre, F.; Rodriguez, A.; Saji, C.; Sakuda, M.; Sanchez, F.; Sarrat, A.; Sasaki, T.; Sato, H.; Scholberg, K.; Schroeter, R.; Sekiguchi, M.; Shiozawa, M.; Shiraishi, K. K.; Sitjes, G.; Smy, M.; Sobel, H.; Sorel, M.; Stone, J.; Sulak, L.; Suzuki, A.; Suzuki, Y.; Takahashi, T.; Takenaga, Y.; Takeuchi, Y.; Taki, K.; Takubo, Y.; Tamura, N.; Tanaka, M.; Terri, R.; T'Jampens, S.; Tornero-Lopez, A.; Totsuka, Y.; Ueda, S.; Vagins, M. R.; Whitehead, L.; Walter, C. W.; Wang, W.; Wilkes, R. J.; Yamada, S.; Yamamoto, S.; Yanagisawa, C.; Yershov, N.; Yokoyama, H.; Yokoyama, M.; Yoo, J.; Yoshida, M.; Zalipska, J. (American Physical Society, 2006-09-01)
    The weak nucleon axial-vector form factor for quasi-elastic interactions is determined using neutrino interaction data from the K2K Scintillating Fiber detector in the neutrino beam at KEK. More than 12,000 events are analyzed, of which half are charged-current quasi-elastic interactions νμn → μ-p occurring primarily in oxygen nuclei. We use a relativistic Fermi gas model for oxygen and assume the form factor is approximately a dipole with one parameter, the axial vector mass MA, and fit to the shape of the distribution of the square of the momentum transfer from the nucleon to the nucleus. Our best fit result for MA = 1.20 ± 0.12 GeV. Furthermore, this analysis includes updated vector form factors from recent electron scattering experiments and a discussion of the effects of the nucleon momentum on the shape of the fitted distributions.
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    Search for coherent charged pion production in neutrino-carbon interactions
    Hasegawa, M.; Aliu, E.; Andringa, S.; Aoki, S.; Argyriades, J.; Asakura, K.; Ashie, R.; Berns, H.; Bhang, H.; Blondel, A.; Borghi, S.; Bouchez, J.; Burguet-Castell, J.; Casper, D.; Cavata, C.; Cervera, A.; Chen, S. M.; Cho, K. O.; Choi, J. H.; Dore, U.; Espinal, X.; Fechner, M.; Fernandez, E.; Fukuda, Y.; Gomez-Cadenas, J. J.; Gran, R.; Hara, T.; Hasegawa, T.; Hayashi, K.; Hayato, Y.; Helmer, R. L.; Hill, J.; Hiraide, K.; Hosaka, J.; Ichikawa, A. K.; Iinuma, M.; Ikeda, A.; Inagaki, T.; Ishida, T.; Ishihara, K.; Ishii, T.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jeon, E. J.; Jeong, I. S.; Joo, K. K.; Jover, G.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kato, I.; Kearns, E.; Kerr, D.; Kim, C. O.; Khabibullin, M.; Khotjantsev, A.; Kielczewska, D.; Kim, J. Y.; Kim, S. B.; Kitching, P.; Kobayashi, K.; Kobayashi, T.; Konaka, A.; Koshio, Y.; Kropp, W.; Kubota, J.; Kudenko, Y.; Kuno, Y.; Kutter, T.; Learned, J.; Likhoded, S.; Lim, I. T.; Loverre, P. F.; Ludovici, L.; Maesaka, H.; Mallet, J.; Mariani, Camillo; Maruyama, T.; Matsuno, S.; Matveev, V. A.; Mauger, C.; McConnel, K.; McGrew, C.; Mikheyev, S.; Minamino, A.; Mine, S.; Mineev, O.; Mitsuda, C.; Miura, M.; Moriguchi, Y.; Morita, T.; Moriyama, S.; Nakadaira, T.; Nakahata, M.; Nakamura, K.; Nakano, I.; Nakaya, T.; Nakayama, S.; Namba, T.; Nambu, R.; Nawang, S.; Nishikawa, K.; Nitta, K.; Nova, F.; Novella, P.; Obayashi, Y.; Okada, A.; Okumura, K.; Oser, S. M.; Oyama, Y.; Pac, M. Y.; Pierre, F.; Rodriguez, A.; Saji, C.; Sakuda, M.; Sanchez, F.; Sarrat, A.; Sasaki, T.; Sato, H.; Scholberg, K.; Schroeter, R.; Sekiguchi, M.; Sharkey, E.; Shiozawa, M.; Shiraishi, K. K.; Sitjes, G.; Smy, M.; Sobel, H.; Stone, J.; Sulak, L.; Suzuki, A.; Suzuki, Y.; Takahashi, T.; Takenaga, Y.; Takeuchi, Y.; Taki, K.; Takubo, Y.; Tamura, N.; Tanaka, M.; Terri, R.; T'Jampens, S.; Tornero-Lopez, A.; Totsuka, Y.; Ueda, S.; Vagins, M. R.; Whitehead, L.; Walter, C. W.; Wang, W.; Wilkes, R. J.; Yamada, S.; Yamamoto, S.; Yanagisawa, C.; Yershov, N.; Yokoyama, H.; Yokoyama, M.; Yoo, J.; Yoshida, M.; Zalipska, J. (American Physical Society, 2005-12-16)
    We report the result from a search for charged-current coherent pion production induced by muon neutrinos with a mean energy of 1.3 GeV. The data are collected with a fully active scintillator detector in the K2K long-baseline neutrino oscillation experiment. No evidence for coherent pion production is observed and an upper limit of 0.60×10−2 is set on the cross section ratio of coherent pion production to the total charged-current interaction at 90% confidence level. This is the first experimental limit for coherent charged pion production in the energy region of a few GeV.