Upper limit on the diffuse flux of ultrahigh energy Tau Neutrinos from the Pierre Auger Observatory
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(Published version)
Date
2008
Authors
Abraham, J.
Abreu, P.
Aglietta, M.
Aguirre, I.
Allard, D.
Allekotte, I.
Allen, J.
Allison, P.
Alvarez-Muniz, J.
Ambrosio, M.
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Journal article
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Physical Review Letters, 2008; 100(21):211101-1-211101-7
Statement of Responsibility
J. Abraham....R. W. Clay....B. R. Dawson....M. Ziolkowski et al. (Pierre Auger Collaboration)
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Abstract
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau neutrinos that interact in Earth's crust. Tau leptons from ντ charged-current interactions can emerge and decay in the atmosphere to produce a nearly horizontal shower with a significant electromagnetic component. The data collected between 1 January2004 and 31 August 2007 are used to place an upper limit on the diffuse flux of ντ at EeV energies. Assuming an Eν-2 differential energy spectrum the limit set at 90% C.L. is Eν2dNντ/dEν<1.3×10-7GeVcm-2s-1sr-1 in the energy range 2×1017eV<2×1019eV.
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©2008 American Physical Society