First Observation of the Greisen-Zatsepin-Kuzmin Suppression

R. U. Abbasi; T. Abu‐Zayyad; M. Allen; J. F. Amman; G. Archbold; K. Belov; J. W. Belz; S. Y. Ben Zvi; D. R. Bergman; S. A. Blake; O. Brusova; G. W. Burt; C. Cannon; Zhen Cao; Brian Connolly; W. Deng; Y. Fedorova; C. Finley; R. Gray; W. Hanlon; C. M. Hoffman; M. H. Holzscheiter; G. Hughes; P. Hüntemeyer; B. F. Jones; C. C. H. Jui; K. Kim; M. Kirn; E. C. Loh; M. M. Maestas; Naohiro Manago; Lukáš Marek; K. Martens; J. Matthews; J. N. Matthews; Sheva Moore; A. P. O’Neill; C. A. Painter; L. Perera; K. Reil; R. Riehle; M. S. Roberts; D. Rodriguez; M. Sasaki; S. Schnetzer; L. M. Scott; G. Sinnis; J. D. Smith; P. Sokolsky; C. Song; R. W. Springer; B. T. Stokes; S. B. Thomas; J. R. Thomas; G. B. Thomson; D. Tupa; S. Westerhoff; Lawrence Wiencke; X. Zhang; A. Zech

doi:10.1103/physrevlett.100.101101

First Observation of the Greisen-Zatsepin-Kuzmin Suppression

R. U. Abbasi(University of Utah), T. Abu‐Zayyad(University of Utah), M. Allen(University of Utah), J. F. Amman(Los Alamos National Laboratory), G. Archbold(University of Utah), K. Belov(University of Utah), J. W. Belz(University of Utah), S. Y. Ben Zvi(Columbia University), D. R. Bergman(Rutgers, The State University of New Jersey), S. A. Blake(University of Utah), O. Brusova(University of Utah), G. W. Burt(University of Utah), C. Cannon(University of Utah), Zhen Cao(University of Utah), Brian Connolly(Columbia University), W. Deng(University of Utah), Y. Fedorova(University of Utah), C. Finley(Columbia University), R. Gray(University of Utah), W. Hanlon(University of Utah), C. M. Hoffman(Los Alamos National Laboratory), M. H. Holzscheiter(Los Alamos National Laboratory), G. Hughes(Rutgers, The State University of New Jersey), P. Hüntemeyer(University of Utah), B. F. Jones(University of Utah), C. C. H. Jui(University of Utah), K. Kim(University of Utah), M. Kirn(Montana State University), E. C. Loh(University of Utah), M. M. Maestas(University of Utah), Naohiro Manago(The University of Tokyo), Lukáš Marek(Los Alamos National Laboratory), K. Martens(University of Utah), J. Matthews(University of New Mexico), J. N. Matthews(University of Utah), Sheva Moore(University of Utah), A. P. O’Neill(Columbia University), C. A. Painter(Los Alamos National Laboratory), L. Perera(Rutgers, The State University of New Jersey), K. Reil(University of Utah), R. Riehle(University of Utah), M. S. Roberts(University of New Mexico), D. Rodriguez(University of Utah), M. Sasaki(The University of Tokyo), S. Schnetzer(Rutgers, The State University of New Jersey), L. M. Scott(Rutgers, The State University of New Jersey), G. Sinnis(Los Alamos National Laboratory), J. D. Smith(University of Utah), P. Sokolsky(University of Utah), C. Song(Columbia University), R. W. Springer(University of Utah), B. T. Stokes(University of Utah), S. B. Thomas(University of Utah), J. R. Thomas(University of Utah), G. B. Thomson(Rutgers, The State University of New Jersey), D. Tupa(Los Alamos National Laboratory), S. Westerhoff(Columbia University), Lawrence Wiencke(University of Utah), X. Zhang(Columbia University), A. Zech(Rutgers, The State University of New Jersey)

Physical Review Letters

March 10, 2008

10.1103/physrevlett.100.101101

Cited by 742Open Access

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Abstract

The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard deviations. HiRes' measurement of the flux of ultrahigh energy cosmic rays shows a sharp suppression at an energy of 6 x 10(19) eV, consistent with the expected cutoff energy. We observe the ankle of the cosmic-ray energy spectrum as well, at an energy of 4 x 10(18) eV. We describe the experiment, data collection, and analysis and estimate the systematic uncertainties. The results are presented and the calculation of the statistical significance of our observation is described.

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