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

THE PIERRE AUGER COLLABORATION.; S. J. SCIUTTO

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Año: 2008 vol. 100 p. 211101 - 211101

0031-9007

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
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 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 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 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 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
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
at EeV energies. Assuming an E
2
differential energy spectrum the limit set at 90% C.L. isdifferential energy spectrum the limit set at 90% C.L. is E22
dN
=dE
< 1:3 10
7 GeV cm
2 s
1 sr
1 in the energy range 2 1017 eV<E
< 2 1019 eV.dN
=dE
< 1:3 10
7 GeV cm
2 s
1 sr
1 in the energy range 2 1017 eV<E
< 2 1019 eV.