Search for electron neutrino appearance in a 250 km long-baseline experiment.
Search for electron neutrino appearance in a 250 km long-baseline experiment.
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DOI：
10.1103/physrevlett.93.051801
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发表时间：
2004-02
影响因子：
8.6
通讯作者：
M. H. Ahn;S. Aoki;Y. Ashie;H. Bhang;S. Boyd;D. Casper;J. Choi;S. Fukuda;Y. Fukuda;R. Gran;T. Hara;M. Hasegawa;T. Hasegawa;K. Hayashi;Y. Hayato;J. Hill;A. Ichikawa;A. Ikeda;T. Inagaki;T. Ishida;T. Ishii;M. Ishitsuka;Y. Itow;T. Iwashita;H. Jang;J. Jang;E. Jeon;K. Joo;C. Jung;T. Kajita;J. Kameda;K. Kaneyuki;I. Kato;E. Kearns;A. Kibayashi;D. Kiełczewska;B. Kim;C. Kim;J. Kim;S. Kim;K. Kobayashi;T. Kobayashi;Y. Koshio;W. Kropp;J. Learned;S. Lim;I. Lim;H. Maesaka;T. Maruyama;S. Matsuno;C. Mauger;C. Mcgrew;A. Minamino;S. Mine;M. Miura;K. Miyano;T. Morita;S. Moriyama;M. Nakahata;K. Nakamura;I. Nakano;F. Nakata;T. Nakaya;S. Nakayama;T. Namba;R. Nambu;K. Nishikawa;S. Nishiyama;S. Noda;Y. Obayashi;A. Okada;Y. Oyama;M. Pac;H. Park;C. Saji;M. Sakuda;A. Sarrat;T. Sasaki;N. Sasao;K. Scholberg;M. Sekiguchi;E. Sharkey;M. Shiozawa;K. Shiraishi;M. Smy;H. Sobel;J. Stone;Y. Suga;L. Sulak;A. Suzuki;Y. Suzuki;Y. Takeuchi;N. Tamura;M. Tanaka;Y. Totsuka;S. Ueda;M. Vagins;C. Walter;W. Wang;R. Wilkes;S. Yamada;S. Yamamoto;C. Yanagisawa;H. Yokoyama;J. Yoo;M. Yoshida;J. Zalipska
中科院分区：
文献类型：
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作者：
M. H. Ahn;S. Aoki;Y. Ashie;H. Bhang;S. Boyd;D. Casper;J. Choi;S. Fukuda;Y. Fukuda;R. Gran;T. Hara;M. Hasegawa;T. Hasegawa;K. Hayashi;Y. Hayato;J. Hill;A. Ichikawa;A. Ikeda;T. Inagaki;T. Ishida;T. Ishii;M. Ishitsuka;Y. Itow;T. Iwashita;H. Jang;J. Jang;E. Jeon;K. Joo;C. Jung;T. Kajita;J. Kameda;K. Kaneyuki;I. Kato;E. Kearns;A. Kibayashi;D. Kiełczewska;B. Kim;C. Kim;J. Kim;S. Kim;K. Kobayashi;T. Kobayashi;Y. Koshio;W. Kropp;J. Learned;S. Lim;I. Lim;H. Maesaka;T. Maruyama;S. Matsuno;C. Mauger;C. Mcgrew;A. Minamino;S. Mine;M. Miura;K. Miyano;T. Morita;S. Moriyama;M. Nakahata;K. Nakamura;I. Nakano;F. Nakata;T. Nakaya;S. Nakayama;T. Namba;R. Nambu;K. Nishikawa;S. Nishiyama;S. Noda;Y. Obayashi;A. Okada;Y. Oyama;M. Pac;H. Park;C. Saji;M. Sakuda;A. Sarrat;T. Sasaki;N. Sasao;K. Scholberg;M. Sekiguchi;E. Sharkey;M. Shiozawa;K. Shiraishi;M. Smy;H. Sobel;J. Stone;Y. Suga;L. Sulak;A. Suzuki;Y. Suzuki;Y. Takeuchi;N. Tamura;M. Tanaka;Y. Totsuka;S. Ueda;M. Vagins;C. Walter;W. Wang;R. Wilkes;S. Yamada;S. Yamamoto;C. Yanagisawa;H. Yokoyama;J. Yoo;M. Yoshida;J. Zalipska
我们在 K2K 长基线中微子实验中对加速器产生的 μ 子中微子的电子中微子外观进行了研究。在数据中发现了一个候选事件，对应于目标上 4.8 x 10(19) 质子的暴露。在没有中微子振荡的情况下，预期背景估计为 2.4+/-0.6 个事件，主要是对中性流 pi(0) 产生事件的错误识别。我们排除了 90% C.L 处的 nu(micro) 到 nu(e) 振荡。对于sin((2)2theta(microe)(大约1/2sin((2)2theta(13))>0.15 at Deltam(2)(microe)=2.8 x 10(-3) eV(2)的2味近似中的有效混合角，K2K中nu(micro)消失分析的最佳拟合值。最严格的限制在 Deltam(2)(microe)=6 x 10(-3) eV(2) 时获得 sin((2)2theta(microe)<0.09。
We present a search for electron neutrino appearance from accelerator-produced muon neutrinos in the K2K long-baseline neutrino experiment. One candidate event is found in the data corresponding to an exposure of 4.8 x 10(19) protons on target. The expected background in the absence of neutrino oscillations is estimated to be 2.4+/-0.6 events and is dominated by misidentification of events from neutral current pi(0) production. We exclude the nu(micro) to nu(e) oscillations at 90% C.L. for the effective mixing angle in the 2-flavor approximation of sin((2)2theta(microe)( approximately 1/2sin((2)2theta(13))>0.15 at Deltam(2)(microe)=2.8 x 10(-3) eV(2), the best-fit value of the nu(micro) disappearance analysis in K2K. The most stringent limit of sin((2)2theta(microe)<0.09 is obtained at Deltam(2)(microe)=6 x 10(-3) eV(2).