Speaker
Description
At 6.3 PeV, the Glashow resonance ($\bar{\nu}_e + e^- \to W^- \to \tau^-\bar{\nu}_\tau$) feeds taus into TAMBO's detection channel, making a nominally $\nu_\tau$-only telescope sensitive to $\bar{\nu}_e$. This opens the door to flavor-composition measurements at the PeV scale and to a neutrino-versus-antineutrino measurement. But is this measurement actually feasible in practice? We assess the realistic potential of isolating the $\bar{\nu}_e$ fraction from the dominant $\nu_\tau + \bar{\nu}_\tau$ background. Drawing on recent forecasting efforts, the underlying physics is well-established. Flavor-composition measurements could be viable if the PeV neutrino flux is high enough to yield tens of events. However, using it to distinguish neutrino production models like $pp$ vs. $p\gamma$ (the former producing more $\bar{\nu}_e$) remains out of reach. Feasibility hinges on a cascade of sensitive analytical choices: the assumed PeV flux, $\bar{\nu}_e$ acceptance modeling, shower-energy smearing, and the rigorous statistical treatment required near physical boundaries. Ultimately, we establish the specific analytical conditions required for TAMBO to successfully and honestly execute this measurement.