Search for electron neutrino appearance in a 250 km long-baseline experiment

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 osci...

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Veröffentlicht in:	Physical review letters 2004-07, Vol.93 (5), p.051801.1-051801.5, Article 051801
Hauptverfasser:	AHN, M. H, AOKI, S, HARA, T, HASEGAWA, M, HASEGAWA, T, HAYASHI, K, HAYATO, Y, HILL, J, ICHIKAWA, A. K, IKEDA, A, INAGAKI, T, ISHIDA, T, ASHIE, Y, ISHII, T, ISHITSUKA, M, ITOW, Y, IWASHITA, T, JANG, H. I, JANG, J. S, JEON, E. J, JOO, K. K, JUNG, C. K, KAJITA, T, BHANG, H, KAMEDA, J, KANEYUKI, K, KATO, I, KEARNS, E, KIBAYASHI, A, KIELCZEWSKA, D, KIM, B. J, KIM, C. O, KIM, J. Y, KIM, S. B, BOYD, S, KOBAYASHI, K, KOBAYASHI, T, KOSHIO, Y, KROPP, W. R, LEARNED, J. G, LIM, S. H, LIM, I. T, MAESAKA, H, MARUYAMA, T, MATSUNO, S, CASPER, D, MAUGER, C, MCGREW, C, MINAMINO, A, MINE, S, MIURA, M, MIYANO, K, MORITA, T, MORIYAMA, S, NAKAHATA, M, NAKAMURA, K, CHOI, J. H, FUKUDA, S, FUKUDA, Y, GRAN, R
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomical and space-research instrumentation Astronomy Earth, ocean, space Exact sciences and technology Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations Leptons Neutrino interactions Neutrino mass and mixing Neutrino, muon, pion, and other elementary particle detectors cosmic ray detectors Physics Properties of specific particles Specific reactions and phenomenology The physics of elementary particles and fields
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Zusammenfassung:	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)
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.93.051801