APS » Phys. Rev. Lett. » Volume 97 » Issue 19

D. G. Michael,⁵ P. Adamson,^11,21,30 T. Alexopoulos,³⁶ W. W. M. Allison,²⁴ G. J. Alner,²⁶ K. Anderson,¹¹ C. Andreopoulos,^26,2 M. Andrews,¹¹ R. Andrews,¹¹ K. E. Arms,²² R. Armstrong,¹⁴ C. Arroyo,²⁹ D. J. Auty,³⁰ S. Avvakumov,²⁹ D. S. Ayres,¹ B. Baller,¹¹ B. Barish,⁵ M. A. Barker,²⁴ P. D. Barnes, Jr.,²⁰ G. Barr,²⁴ W. L. Barrett,³⁴ E. Beall,^1,22 B. R. Becker,²² A. Belias,²⁶ T. Bergfeld,²⁸ R. H. Bernstein,¹¹ D. Bhattacharya,²⁵ M. Bishai,⁴ A. Blake,⁶ V. Bocean,¹¹ B. Bock,²³ G. J. Bock,¹¹ J. Boehm,¹² D. J. Boehnlein,¹¹ D. Bogert,¹¹ P. M. Border,²² C. Bower,¹⁴ S. Boyd,²⁵ E. Buckley-Geer,¹¹ C. Bungau,³⁰ A. Byon-Wagner,¹¹ A. Cabrera,²⁴ J. D. Chapman,⁶ T. R. Chase,²² D. Cherdack,³³ S. K. Chernichenko,¹⁵ S. Childress,¹¹ B. C. Choudhary,^11,5 J. H. Cobb,²⁴ J. D. Cossairt,¹¹ H. Courant,²² D. A. Crane,¹ A. J. Culling,⁶ J. W. Dawson,¹ J. K. de Jong,¹³ D. M. DeMuth,²² A. De Santo,²⁴ M. Dierckxsens,⁴ M. V. Diwan,⁴ M. Dorman,^24,26 G. Drake,¹ D. Drakoulakos,² R. Ducar,¹¹ T. Durkin,²⁶ A. R. Erwin,³⁶ C. O. Escobar,⁷ J. J. Evans,²⁴ O. D. Fackler,²⁰ E. Falk Harris,³⁰ G. J. Feldman,¹² N. Felt,¹² T. H. Fields,¹ R. Ford,¹¹ M. V. Frohne,³ H. R. Gallagher,^33,24,1,22 M. Gebhard,¹⁴ G. A. Giurgiu,¹ A. Godley,²⁸ J. Gogos,²² M. C. Goodman,¹ Yu. Gornushkin,¹⁸ P. Gouffon,²⁷ R. Gran,²³ E. Grashorn,^22,23 N. Grossman,¹¹ J. J. Grudzinski,¹ K. Grzelak,²⁴ V. Guarino,¹ A. Habig,²³ R. Halsall,²⁶ J. Hanson,⁵ D. Harris,¹¹ P. G. Harris,³⁰ J. Hartnell,^26,24 E. P. Hartouni,²⁰ R. Hatcher,¹¹ K. Heller,²² N. Hill,¹¹ Y. Ho,¹⁰ A. Holin,²¹ C. Howcroft,^5,6 J. Hylen,¹¹ M. Ignatenko,¹⁸ D. Indurthy,³² G. M. Irwin,²⁹ M. Ishitsuka,¹⁴ D. E. Jaffe,¹² C. James,¹¹ L. Jenner,²¹ D. Jensen,¹¹ T. Joffe-Minor,¹ T. Kafka,³³ H. J. Kang,²⁹ S. M. S. Kasahara,²² J. Kilmer,¹¹ H. Kim,⁵ M. S. Kim,²⁵ G. Koizumi,¹¹ S. Kopp,³² M. Kordosky,^21,32 D. J. Koskinen,^21,23 M. Kostin,³² S. K. Kotelnikov,¹⁹ D. A. Krakauer,¹ A. Kreymer,¹¹ S. Kumaratunga,²² A. S. Ladran,²⁰ K. Lang,³² C. Laughton,¹¹ A. Lebedev,¹² R. Lee,¹² W. Y. Lee,¹⁰ M. A. Libkind,²⁰ J. Ling,²⁸ J. Liu,³² P. J. Litchfield,^22,26 R. P. Litchfield,²⁴ N. P. Longley,²² P. Lucas,¹¹ W. Luebke,¹³ S. Madani,²⁶ E. Maher,²² V. Makeev,^11,15 W. A. Mann,³³ A. Marchionni,¹¹ A. D. Marino,¹¹ M. L. Marshak,²² J. S. Marshall,⁶ N. Mayer,²³ J. McDonald,²⁵ A. M. McGowan,^1,22 J. R. Meier,²² G. I. Merzon,¹⁹ M. D. Messier,^14,12 R. H. Milburn,³³ J. L. Miller,^17,14 W. H. Miller,²² S. R. Mishra,^28,12 A. Mislivec,²³ P. S. Miyagawa,²⁴ C. D. Moore,¹¹ J. Morfín,¹¹ R. Morse,³⁰ L. Mualem,²² S. Mufson,¹⁴ S. Murgia,²⁹ M. J. Murtagh,⁴ J. Musser,¹⁴ D. Naples,²⁵ C. Nelson,¹¹ J. K. Nelson,^35,11,22 H. B. Newman,⁵ F. Nezrick,¹¹ R. J. Nichol,²¹ T. C. Nicholls,²⁶ J. P. Ochoa-Ricoux,⁵ J. Oliver,¹² W. P. Oliver,³³ V. A. Onuchin,¹⁵ T. Osiecki,³² R. Ospanov,³² J. Paley,¹⁴ V. Paolone,²⁵ A. Para,¹¹ T. Patzak,^9,33 . Pavlovi,³² G. F. Pearce,²⁶ N. Pearson,²² C. W. Peck,⁵ C. Perry,²⁴ E. A. Peterson,²² D. A. Petyt,^22,26,24 H. Ping,³⁶ R. Piteira,⁹ R. Pittam,²⁴ A. Pla-Dalmau,¹¹ R. K. Plunkett,¹¹ L. E. Price,¹ M. Proga,³² D. R. Pushka,¹¹ D. Rahman,²² R. A. Rameika,¹¹ T. M. Raufer,²⁴ A. L. Read,¹¹ B. Rebel,^11,14 J. Reichenbacher,¹ D. E. Reyna,¹ C. Rosenfeld,²⁸ H. A. Rubin,¹³ K. Ruddick,²² V. A. Ryabov,¹⁹ R. Saakyan,²¹ M. C. Sanchez,^12,33 N. Saoulidou,^11,2 J. Schneps,³³ P. V. Schoessow,¹ P. Schreiner,³ R. Schwienhorst,²² V. K. Semenov,¹⁵ S.-M. Seun,¹² P. Shanahan,¹¹ P. D. Shield,²⁴ W. Smart,¹¹ V. Smirnitsky,¹⁶ C. Smith,^21,30,5 P. N. Smith,³⁰ A. Sousa,^24,33 B. Speakman,²² P. Stamoulis,² A. Stefanik,¹¹ P. Sullivan,²⁴ J. M. Swan,²⁰ P. A. Symes,³⁰ N. Tagg,^33,24 R. L. Talaga,¹ A. Terekhov,¹⁹ E. Tetteh-Lartey,³¹ J. Thomas,^21,24,11 J. Thompson,²⁵ M. A. Thomson,⁶ J. L. Thron,¹ G. Tinti,²⁴ R. Trendler,¹¹ J. Trevor,⁵ I. Trostin,¹⁶ V. A. Tsarev,¹⁹ G. Tzanakos,² J. Urheim,^14,22 P. Vahle,^21,32 M. Vakili,³¹ K. Vaziri,¹¹ C. Velissaris,³⁶ V. Verebryusov,¹⁶ B. Viren,⁴ L. Wai,²⁹ C. P. Ward,⁶ D. R. Ward,⁶ M. Watabe,³¹ A. Weber,^24,26 R. C. Webb,³¹ A. Wehmann,¹¹ N. West,²⁴ C. White,¹³ R. F. White,³⁰ S. G. Wojcicki,²⁹ D. M. Wright,²⁰ Q. K. Wu,²⁸ W. G. Yan,⁸ T. Yang,²⁹ F. X. Yumiceva,³⁵ J. C. Yun,¹¹ H. Zheng,⁵ M. Zois,² and R. Zwaska^11,32

(MINOS Collaboration)

¹Argonne National Laboratory, Argonne, Illinois 60439, USA
²Department of Physics, University of Athens, GR-15771 Athens, Greece
³Physics Department, Benedictine University, Lisle, Illinois 60532, USA
⁴Brookhaven National Laboratory, Upton, New York 11973, USA
⁵Lauritsen Laboratory, California Institute of Technology, Pasadena, California 91125, USA
⁶Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom
⁷Universidade Estadual de Campinas, IF-UNICAMP, CP 6165, 13083-970, Campinas, SP, Brazil
⁸Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
⁹APC – Collège de France, 11 Place Marcelin Berthelot, F-75231 Paris Cedex 05, France
¹⁰Physics Department, Columbia University, New York, New York 10027, USA
¹¹Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
¹²Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
¹³Physics Division, Illinois Institute of Technology, Chicago, Illinois 60616, USA
¹⁴Physics Department, Indiana University, Bloomington, Indiana 47405, USA
¹⁵Institute for High Energy Physics, Protvino, Moscow Region RU-140284, Russia
¹⁶High Energy Experimental Physics Department, Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya, 25, 117218 Moscow, Russia
¹⁷Physics Department, James Madison University, Harrisonburg, Virginia 22807, USA
¹⁸Joint Institute for Nuclear Research, Dubna, Moscow Region, RU-141980, Russia
¹⁹Nuclear Physics Department, Lebedev Physical Institute, Leninsky Prospect 53, 117924 Moscow, Russia
²⁰Lawrence Livermore National Laboratory, Livermore, California 94550, USA
²¹Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
²²University of Minnesota, Minneapolis, Minnesota 55455, USA
²³Department of Physics, University of Minnesota–Duluth, Duluth, Minnesota 55812, USA
²⁴Subdepartment of Particle Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
²⁵Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
²⁶Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom
²⁷Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970, São Paulo, SP, Brazil
²⁸Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA
²⁹Department of Physics, Stanford University, Stanford, California 94305, USA
³⁰Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN1 9QH, United Kingdom
³¹Physics Department, Texas A&M University, College Station, Texas 77843, USA
³²Department of Physics, University of Texas, 1 University Station, Austin, Texas 78712, USA
³³Physics Department, Tufts University, Medford, Massachusetts 02155, USA
³⁴Physics Department, Western Washington University, Bellingham, Washington 98225, USA
³⁵Department of Physics, College of William & Mary, Williamsburg, Virginia 23187, USA
³⁶Physics Department, University of Wisconsin, Madison, Wisconsin 53706, USA

This Letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rates and energy spectra of charged current _µ interactions are compared in two detectors located along the beam axis at distances of 1 and 735 km. With 1.27×10²⁰ 120 GeV protons incident on the NuMI target, 215 events with energies below 30 GeV are observed at the Far Detector, compared to an expectation of 336±14 events. The data are consistent with _µ disappearance via oscillations with |m|=2.74×10^-3 eV² and sin²(2₂₃)>0.87 (68% C.L.).

©2006 The American Physical Society

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