Upper Limit on the Diffuse Flux of Ultrahigh Energy Tau Neutrinos from the Pierre Auger Observatory

THE PIERRE AUGER COLLABORATION (AUTOR 369 DE 395); M. TUEROS

PHYSICAL REVIEW LETTERS

The American Physical Society

Año: 2008 vol. 100 p. 2111011 - 2111017

0031-9007

that interact in Earth’s crust. Tau leptons from
 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 January 2004 and 31 August 2007 are used to place an upper limit on the diffuse flux of
 at EeV energies. Assuming an E
2
differential energy spectrum the limit set at 90% C.L. is E2
dN
=dE
< 1:3  10
7 GeV cm
2 s
1 sr
1 in the energy range 2  1017 eV