Papers › The Effect of Doppler Broadening on the 6.3 PeV W^- Resonance in e^- Collisions
The Effect of Doppler Broadening on the 6.3 PeV W^- Resonance in e^- Collisions
Amit Loewy, Shmuel Nussinov, Sheldon L. Glashow
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We calculate the Doppler broadening of the W^- resonance produced in ν̅ₑ e^- collisions of cosmic anti-neutrinos with E_ν≈6.3 PeV with electrons in atoms up to Iron. Revisiting this issue is prompted by recent observations of PeV neutrinos by Ice-Cube. Despite its poor energy resolution, the 20% Doppler broadening of the resonance due to electronic motions can produce observable effects via non-linear neutrino absorption near the resonance. The attendant suppression of the peak cross section allows ν̅ₑ to travel correspondingly longer distances. While this effect is unlikely to be directly detected in the near future, it may facilitate terrestrial tomography at depths of ∼10 km, complementing deeper explorations using the more frequent nuclear interactions at lower energies.
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