Review Article

Ultrahigh Energy Neutrinos at the Pierre Auger Observatory

Table 2

Training and blind search periods for the search for Earth-skimming and downward-going neutrino candidates. In the 3rd row we indicate the equivalent period of time of a full surface detector array. In the 4th row we give the number of candidates found in the search period after unblindly applying the cuts selecting inclined and young showers (see Table 1). In the 5th row we give the numerical value of the C.L. limit to the normalization of a diffuse flux of UHE neutrinos assumed to behave with energy as . Systematic uncertainties are included in the value of the limit (see Section 6.3 for details). In the last row we indicate the energy range where the limits apply, typically the energy interval where 90% of the events are expected.

Earth-skimming Downward-going

Training period 1 Nov 04–31 Dec 04 1 Jan 04–31 Oct 07
Blind search period 1 Jan 04–31 May 10 1 Nov 07–31 May 10
Equivalent full auger blind search period 3.5 yr2.0 yr
candidates 0 0
Diffuse limit 90 C.L. ( )
Energy range (EeV) ~0.16–20.0 ~0.1–100.0