Capability of the HAWC Gamma-Ray Observatory for the Indirect Detection of Ultrahigh-Energy Neutrinos

Table 7

Number of detectable charged leptons per year () in HAWC for two different energy bins: 10 PeV–100 PeV and 100 PeV–100 EeV for the extrapolation of the measured IceCube (IC) flux [12] and for the ultrahigh-energy predictions (, , and for the models A, B, and C discussed in Section 2) from [9]. The results are presented for different trigger conditions that correspond to how many HAWC WCDs participate in a track-like event. The addition of the flux to the extrapolation of the IC flux is motivated by their approximation to GZK neutrinos produced by interactions with the EBL and CMB [9]. The eighth column (Bckg) shows the expected number of background signals per year; see the text for details. The last two columns show the time needed (in years) for one charged lepton detection (), using the extrapolation of the IceCube measured flux and also considering the additional GZK flux at ultrahigh energy proposed in [9].

Neutrino energy []	Trigger [m]	: IC	:	:	:	:	Bckg	IC [yr]	[yr]
10 PeV–100 PeV	≥14						0.0145
	≥21						0.0131
	≥28						0.0111
	≥35						0.0088
	≥42						0.0071
100 PeV–100 EeV	≥14						<10^−5
	≥21						<10^−5
	≥28						<10^−5
	≥35						<10^−5
	≥42						<10^−5