K2K

(from KEK to Kamioka)

An improved search for \nu_\mu -> \nu_e oscillation in a long-baseline accelerator experiment
(2 March 2006)

Evidence for muon neutrino oscillation in an accelerator-based experiment
(11 November 2004)
107 observed \nu_\mu -> \nu_\mu events
151 {}^{+12}_{-10} expected events without oscillations
5 \times 10^{-5} (4.0\sigma) probability of a statistical fluctuation (no oscillations)
2.6 \times 10^{-3} probability of a statistical fluctuation (no oscillations) of rate
7.4 \times 10^{-3} probability of a statistical fluctuation (no oscillations) of spectrum
best-fit: \sin^22\theta = 1.0 \Delta{m}^2 = 2.8 \times 10^{-3} \mathrm{eV}^2

Recent Results From K2K
(11 June 2004)
see also: T. Nakaya, K2K results, Neutrino 2004
108 observed \nu_\mu -> \nu_\mu events
150.9 {}^{+11.6}_{-10.0} expected events without oscillations
probability of a statistical fluctuation about 10^{-4}
the observed spectrum reveals the type of distortion expected from oscillations

Useful Links

Recent Results From K2K (10-06-2004).

12-06-2002 K2K New Results, in English, without figures.

12-06-2002 K2K News Release, in Japanese, with nice figures.

Study of Neutrino Oscilation in the Long Baseline Neutrino Experiment, Shuei Yamada, PhD Thesis, University of Tokyo, March 2003.

References

References are divided in
  1 - Neutrino Oscillations

  2 - Physics

  3 - Physics - Conference Proceedings

  4 - Detector

  5 - Detector - Conference Proceedings

  6 - Experimental Test

  7 - Conference Proceedings

The references in each group are listed in approximate inverted chronological order.
Click on the reference label to search it in Spires.

1 - Neutrino Oscillations

[1-1]
Measurement of neutrino oscillation by the K2K experiment, Ahn, M. H. et al. (K2K), Phys. Rev. D74 (2006) 072003, arXiv:hep-ex/0606032.
[1-2]
An improved search for \nu_\mu -> \nu_e oscillation in a long-baseline accelerator experiment, S. Yamamoto et al. (K2K), Phys. Rev. Lett. 96 (2006) 181801, arXiv:hep-ex/0603004.
From the abstract: At \Delta{m}^2 = 2.8 \times 10^{-3} <b>eV</b>^2 , the best fit value of the K2K \nu_\mu disappearance analysis, we set an upper limit of \sin^2 2\theta_{\mu e} < 0.13 at 90% confidence level.
[1-3]
Evidence for muon neutrino oscillation in an accelerator-based experiment, E. Aliu et al. (K2K), Phys. Rev. Lett. 94 (2005) 081802, arXiv:hep-ex/0411038.
[1-4]
Search for electron neutrino appearance in a 250-km long- baseline experiment, Ahn, M. H. et al. (K2K), Phys. Rev. Lett. 93 (2004) 051801, arXiv:hep-ex/0402017.
[1-5]
Indications of Neutrino Oscillation in a 250 km Long- baseline Experiment, Ahn, M. H. et al. (K2K), Phys. Rev. Lett. 90 (2003) 041801, arXiv:hep-ex/0212007.
From the abstract: The K2K experiment observes indications of neutrino oscillation: a reduction of \nu_\mu flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of 80.1^{+6.2}_{-5.4}.
From the article: Best Fit: \Delta{m}^2 = 2.8 \times 10^{-3} \mathrm{eV}^2 , \sin^22\vartheta = 1.0 .... The measured oscillation parameters are consistent with the ones suggested by atmospheric neutrinos. At the time of this letter the K2K experiment has collected approximately one-half of its planned 10^{20} protons on target.
[1-6]
Detection of accelerator produced neutrinos at a distance of 250-km, Ahn, S. H. et al. (K2K), Phys. Lett. B511 (2001) 178-184, arXiv:hep-ex/0103001.

2 - Physics

[2-1]
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., Collaboration, for the K2K (K2K), Phys. Rev. D78 (2008) 032003, arXiv:0805.0186.
[2-2]
Experimental study of the atmospheric neutrino backgrounds for proton decay to positron and neutral pion searches in water Cherenkov detectors, S. Mine et al. (K2K), Phys. Rev. D77 (2008) 032003, arXiv:0801.0182.
[2-3]
Measurement of the quasi-elastic axial vector mass in neutrino-oxygen interactions, Gran, R. et al. (K2K), Phys. Rev. D74 (2006) 052002, arXiv:hep-ex/0603034.
From the abstract: Our best fit result for the axial mass is M_A = 1.20 +- 0.12 <b>GeV</b> .
[2-4]
Search for coherent charged pion production in neutrino carbon interactions, Hasegawa, M. et al. (K2K), Phys. Rev. Lett. 95 (2005) 252301, arXiv:hep-ex/0506008.
From the abstract: ...an upper limit of 0.60 \times 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.
[2-5]
Measurement of single pi0 production in neutral current neutrino interactions with water by a 1.3-GeV wide band muon neutrino beam, Nakayama, S. (K2K), Phys. Lett. B619 (2005) 255, arXiv:hep-ex/0408134.

3 - Physics - Conference Proceedings

[3-1]
Study of neutrino interaction in the K2K and the JHF-Kamioka long baseline neutrino oscillation experiments, Itow, Y., Nucl. Phys. Proc. Suppl. 112 (2002) 3-8.

4 - Detector

[4-1]
Tracking Performance of the Scintillating Fiber Detector in the K2K Experiment, B. J. Kim et al. (K2K), Nucl. Instrum. Meth. A497 (2003) 450, arXiv:hep-ex/0206041.

5 - Detector - Conference Proceedings

[5-1]
The K2K SciBar Detector, K.Nitta et al., Nucl. Instrum. Meth. A535 (2004) 147, arXiv:hep-ex/0406023. 10th Vienna Conference on Instrumentation, Vienna, February 16-21, 2004.

6 - Experimental Test

[6-1]
A Study on the e / mu identification capability of a water Cerenkov detector and the atmospheric neutrino problem, Kasuga, S. et al., Phys. Lett. B374 (1996) 238-242.

7 - Conference Proceedings

[7-1]
Results from K2K and status of T2K, Oyama, Yuichi, arXiv:hep-ex/0512041, 2005. International Conference on New Trends in High-Energy Physics (Crimea2005), Yalta, Ukraine, September 10-17, 2005.
[7-2]
Recent Results from K2K Experiment, Mariani, C. (K2K), arXiv:hep-ex/0505019, 2005. 2005 Electroweak session, XXXXth Rencontres de Moriond.
[7-3]
Recent K2K Results, Takanobu Ishii (K2K), arXiv:hep-ex/0406055, 2004. 5th Workshop on Neutrino Oscillations and their Origin (NOON2004), Tokyo, Japan, February 11-15,2004.
[7-4]
Recent results from K2K, Taiki Iwashita, arXiv:hep-ex/0406051, 2004. XXXIXth Rencontres de Moriond session devoted to Electroweak Interactions and Unified Theories.
[7-5]
K2K results, T. Nakaya (K2K), 2004. Neutrino 2004, 13-19 June 2004, Paris, France. http://neutrino2004.in2p3.fr/slides/tuesday/nakaya.pdf.
Comment: See Recent Results From K2K.
[7-6]
K2K results, Iwashita, T. (K2K), 2004. XXXIX Rencontres de Moriond, Electroweak Interactions and Unified Theories, La Thuile, 21-28 March 2003. http://moriond.in2p3.fr/EW/2004/transparencies/3_Wednesday/3_2_afternoon/3_2_4_Iwashita/Iwashita.pdf.
[7-7]
The Results of Oscillation Analysis in K2K Experiment And An Overview of JHFnu Experiment, I. Kato (K2K), arXiv:hep-ex/0306043, 2003. XXXVIIIth Recontres de Moriond on Electroweak Interaction and Unified Theories, Les Arcs, France, March 15-22, 2003.
[7-8]
Recent results from atmospheric \nu and K2K, Itow, Y., 2003. 2nd International conference on Flavor Physics, ICFP 2003, 6-11 October 2003, Korea Institute for Advanced Study (KIAS). http://newton.kias.re.kr/~hepph/public_html/03icfp/talk/itow1.pdf.
Comment: The figure in slide n.34 shows the K2K excluded region for oscillations of accelerator neutrinos in the \nu_{\mu} -> \nu_e channel as compared with the CHOOZ limit and the Super-Kamiokande allowed region. [M.L.].
[7-9]
Status of the Super-Kamiokande, the K2K-2 experiment and JHF nu project, Y. Hayato, 2003. EPS2003. http://eps2003.physik.rwth-aachen.de/data/talks/parallel/07Neutrino/07Hayato.ppt.
[7-10]
New Results from Super-K and K2K, R. Jeffrey Wilkes (K2K), eConf C020805 (2002) TTH02, arXiv:hep-ex/0212035. Secrets of the B-Meson, Topical Conference, XXX SLAC Summer Institute, SLAC, August, 2002.
[7-11]
Recent Results from the K2K Experiment, C. W. Walter (K2K), eConf C0209101 (2002) TH03, arXiv:hep-ex/0211059. Seventh International Workshop on Tau Lepton Physics (TAU02), Santa Cruz, Ca, USA, Sept 2002.
[7-12]
Present Status of the K2K Experiment, Yuichi Oyama (K2K), arXiv:hep-ex/0210030, 2002. 3rd Conference on Physics beyond the Standard Model (BEYOND2002), Oulu, Finland, June 2-7, 2002.
[7-13]
Latest Results from the K2K experiment, Ichikawa, A. K. (K2K), arXiv:hep-ex/0206037, 2002. XXXVII Rencontres de Moriond Electroweak Interactions and Unified Theories Les Arcs, March 9-16-2002. http://moriond.in2p3.fr/EW/2002/transparencies/3_Tuesday/morning/A_Ichikawa/A_Ichikawa.pdf.
[7-14]
New Results from K2K, Takanobu Ishii (K2K), arXiv:hep-ex/0206033, 2002. Les Rencontres de Physique de la Vallee d'Aoste, La Thuile, Aosta Valley, Italy, March 3-9, 2002. http://www.pi.infn.it/lathuile/2002/talks/ishii.pdf.
[7-15]
Present Status of the K2K Experiment, Oyama, Y. (K2K), 2002. Conference on Physics beyond the Standard Model - BEYOND THE DESERT 02 - Oulu, Finland, 2-7 June 2002. http://cupp.oulu.fi/trans/Oyama.pdf.
[7-16]
K2K Results, Nishikawa, K. (K2K), 2002. XXth International Conference on Neutrino Physics and Astrophysics May 25 - 30, 2002, Munich, Germany. http://neutrino2002.ph.tum.de/pages/transparencies/nishikawa.
[7-17]
Results from the K2K long-baseline neutrino oscillation experiment, Hill, James E. (K2K), eConf C010630 (2001) P206, arXiv:hep-ex/0110034.
[7-18]
Nuint Overview and K2K/JHF, Itow, Y., 2001. NuInt01 : The First International Workshop on Neutrino-Nucleus Interactions in the Few GeV Region December 13-16, 2001, KEK, Tsukuba, Japan. http://neutrino.kek.jp/nuint01/slide/itow.pdf.
[7-19]
Status of K2K, Nakamura, K. (K2K), Nucl. Phys. Proc. Suppl. 91 (2001) 203-209.
[7-20]
Recent results in Super-Kamiokande and K2K, Itow, Y. (Super-Kamiokande and K2K), Phys. Scripta T93 (2001) 53-58.
[7-21]
Results from K2K experiment, Yanagisawa, C., Nucl. Phys. Proc. Suppl. 95 (2001) 130-136.
[7-22]
Recent results from the K2K (KEK-to-Kamioka) neutrino oscillation experiment, Boyd, S., Nucl. Phys. Proc. Suppl. 98 (2001) 175-181, arXiv:hep-ex/0011039.
[7-23]
The first results of K2K long-baseline neutrino oscillation experiment, Ishida, Taku (K2K), AIP Conf. Proc. 549 (2002) 772-776, arXiv:hep-ex/0008047.
[7-24]
Design, construction, and operation of SciFi tracking detector for K2K experiment, Suzuki, A. et al. (K2K), Nucl. Instrum. Meth. A453 (2000) 165-176, arXiv:hep-ex/0004024.
[7-25]
Current status of K2K long baseline neutrino oscillation experiment, Oyama, Yuichi (K2K), arXiv:hep-ex/0004015, 2000.
[7-26]
Status of the K2K long-baseline neutrino-oscillation experiment, Nakamura, K. (K2K), Nucl. Phys. A663 (2000) 795-798.
[7-27]
Experimental results on neutrino oscillations using atmospheric, solar and accelerator beams, Kielczewska, D. (Super-Kamiokande and K2K), Acta Phys. Polon. B31 (2000) 1181-1207.
[7-28]
Results from Super-Kamiokande and status of K2K, Nakamura, K. (Super-KAMIOKANDE and K2K), Nucl. Instrum. Meth. A472 (2000) 329-342.
[7-29]
Results from the K2K experiment, Hayato, Y., 2000. 28th SLAC Summer Institute on Particle Physics: Neutrinos from the Lab, the Sun, and the Cosmos (SSI 2000), Stanford, California, 14-25 Aug 2000.
[7-30]
The recent results from K2K long baseline neutrino oscillation experiment, Itow, Y. (K2K), 2000. 14th Rencontres de Physique de la Valle d"Aoste: Results and Perspectives in Particle Physics, La Thuile, Valle d"Aoste, Italy, 27 Feb - 4 Mar 2000.
[7-31]
Status of the K2K long baseline neutrino oscillation experiment, Sobel, H. W. (K2K), 1999. In "Venice 1999, Neutrino telescopes, vol. 1" 351-360.
[7-32]
A Possible long baseline neutrino oscillation experiment using KEK PS and Super-Kamiokande, Nishikawa, K., 1992. INS-924.

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Last Update: Fri 10 Feb 2012, day 41 of the year 2012, 09:08:55 UTC