Improved Search for _µ_e Oscillation in a Long-Baseline Accelerator Experiment

Abstract

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S. Yamamoto,¹⁶ J. Zalipska,²⁵ E. Aliu,¹ S. Andringa,¹ S. Aoki,¹⁴ J. Argyriades,⁵ K. Asakura,¹⁴ R. Ashie,²⁹ F. Berghaus,³ H. Berns,³³ H. Bhang,²⁴ A. Blondel,⁹ S. Borghi,⁹ J. Bouchez,⁵ J. Burguet-Castell,³² D. Casper,⁴ J. Catala,³² C. Cavata,⁵ A. Cervera,⁹ S. M. Chen,³¹ K. O. Cho,⁶ J. H. Choi,⁶ U. Dore,²³ X. Espinal,¹ M. Fechner,⁵ E. Fernandez,¹ Y. Fukuda,¹⁹ J. Gomez-Cadenas,³² R. Gran,³³ T. Hara,¹⁴ M. Hasegawa,¹⁶ T. Hasegawa,²⁶ K. Hayashi,¹⁶ Y. Hayato,²⁹ R. L. Helmer,³¹ K. Hiraide,¹⁶ J. Hosaka,²⁹ A. K. Ichikawa,¹¹ M. Iinuma,¹² A. Ikeda,²¹ T. Inagaki,¹⁶ T. Ishida,¹¹ K. Ishihara,²⁹ T. Ishii,¹¹ M. Ishitsuka,³⁰ Y. Itow,²⁹ T. Iwashita,¹¹ H. I. Jang,⁶ E. J. Jeon,²⁴ I. S. Jeong,⁶ K. K. Joo,²⁴ G. Jover,¹ C. K. Jung,²⁷ T. Kajita,³⁰ J. Kameda,²⁹ K. Kaneyuki,³⁰ I. Kato,³¹ E. Kearns,² D. Kerr,²⁷ C. O. Kim,¹⁵ M. Khabibullin,¹³ A. Khotjantsev,¹³ D. Kielczewska,^34,25 J. Y. Kim,⁶ S. B. Kim,²⁴ P. Kitching,³¹ K. Kobayashi,²⁷ T. Kobayashi,¹¹ A. Konaka,³¹ Y. Koshio,²⁹ W. Kropp,⁴ J. Kubota,¹⁶ Yu. Kudenko,¹³ Y. Kuno,²² Y. Kurimoto,¹⁶ T. Kutter,^17,3 J. Learned,¹⁰ S. Likhoded,² I. T. Lim,⁶ P. F. Loverre,²³ L. Ludovici,²³ H. Maesaka,¹⁶ J. Mallet,⁵ C. Mariani,²³ S. Matsuno,¹⁰ V. Matveev,¹³ K. McConnel,¹⁸ C. McGrew,²⁷ S. Mikheyev,¹³ A. Minamino,²⁹ S. Mine,⁴ O. Mineev,¹³ C. Mitsuda,²⁹ M. Miura,²⁹ Y. Moriguchi,¹⁴ T. Morita,¹⁶ S. Moriyama,²⁹ T. Nakadaira,¹¹ M. Nakahata,²⁹ K. Nakamura,¹¹ I. Nakano,²¹ T. Nakaya,¹⁶ S. Nakayama,³⁰ T. Namba,²⁹ R. Nambu,²⁹ S. Nawang,¹² K. Nishikawa,¹⁶ K. Nitta,¹¹ F. Nova,¹ P. Novella,³² Y. Obayashi,²⁹ A. Okada,³⁰ K. Okumura,³⁰ S. M. Oser,³ Y. Oyama,¹¹ M. Y. Pac,⁷ F. Pierre,⁵ A. Rodriguez,¹ C. Saji,³⁰ M. Sakuda,²¹ F. Sanchez,¹ A. Sarrat,²⁷ T. Sasaki,¹⁶ H. Sato,¹⁶ K. Scholberg,^8,18 R. Schroeter,⁹ M. Sekiguchi,¹⁴ M. Shiozawa,²⁹ K. Shiraishi,³³ G. Sitjes,³² M. Smy,⁴ H. Sobel,⁴ M. Sorel,³² J. Stone,² L. Sulak,² A. Suzuki,¹⁴ Y. Suzuki,²⁹ T. Takahashi,¹² Y. Takenaga,³⁰ Y. Takeuchi,²⁹ K. Taki,²⁹ Y. Takubo,²² N. Tamura,²⁰ M. Tanaka,¹¹ R. Terri,²⁷ S. T'Jampens,⁵ A. Tornero-Lopez,³² Y. Totsuka,¹¹ S. Ueda,¹⁶ M. Vagins,⁴ L. Whitehead,²⁷ C. W. Walter,⁸ W. Wang,² R. J. Wilkes,³³ S. Yamada,²⁹ C. Yanagisawa,²⁷ N. Yershov,¹³ H. Yokoyama,²⁸ M. Yokoyama,¹⁶ J. Yoo,²⁴ and M. Yoshida²²

(K2K Collaboration)

¹Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
²Department of Physics, Boston University, Boston, Massachusetts 02215, USA
³Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
⁴Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575, USA
⁵DAPNIA, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
⁶Department of Physics, Chonnam National University, Kwangju 500-757, Korea
⁷Department of Physics, Dongshin University, Naju 520-714, Korea
⁸Department of Physics, Duke University, Durham, North Carolina 27708, USA
⁹DPNC, Section de Physique, University of Geneva, CH1211, Geneva 4, Switzerland
¹⁰Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
¹¹High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
¹²Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
¹³Institute for Nuclear Research, Moscow 117312, Russia
¹⁴Kobe University, Kobe, Hyogo 657-8501, Japan
¹⁵Department of Physics, Korea University, Seoul 136-701, Korea
¹⁶Department of Physics, Kyoto University, Kyoto 606-8502, Japan
¹⁷Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA
¹⁸Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
¹⁹Department of Physics, Miyagi University of Education, Sendai 980-0845, Japan
²⁰Department of Physics, Niigata University, Niigata, Niigata 950-2181, Japan
²¹Department of Physics, Okayama University, Okayama, Okayama 700-8530, Japan
²²Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
²³University of Rome La Sapienza and INFN, I-000185 Rome, Italy
²⁴Department of Physics, Seoul National University, Seoul 151-747, Korea
²⁵A. Soltan Institute for Nuclear Studies, 00-681 Warsaw, Poland
²⁶Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
²⁷Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA
²⁸Department of Physics, Tokyo University of Science, Noda, Chiba 278-0022, Japan
²⁹Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan
³⁰Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
³¹TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
³²Instituto de Física Corpuscular, E-46071 Valencia, Spain
³³Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
³⁴Institute of Experimental Physics, Warsaw University, 00-681 Warsaw, Poland

Received 2 March 2006; published 12 May 2006

Weperformed an improved search for _µ --> _e oscillation with the KEKto Kamioka (K2K) long-baseline neutrino oscillation experiment, using the fulldata sample of 9.2×10¹⁹ protons on target. No evidence fora _e appearance signal was found, and we set boundson the _µ --> _e oscillation parameters. At Delta m²=2.8×10^-3 eV², the best-fit valueof the K2K _µ disappearance analysis, we set an upperlimit of sin²2 theta _µe<0.13 at a 90% confidence level.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.181801
DOI:	10.1103/PhysRevLett.96.181801
PACS:	14.60.Pq; 13.15.+g; 25.30.Pt; 95.55.Vj 14.60.Pq Neutrino mass and mixing 13.15.+g Neutrino interactions 25.30.Pt Nuclear neutrino scattering 95.55.Vj Neutrino, muon, pion, and other elementary particle detectors; cosmic ray detectors YEAR: 2006
KEYWORDS:	neutrinos, neutrino oscillations