Double and multiple bangs at tau neutrino telescopes: A novel probe of sphalerons with cosmogenic neutrinos

TL;DR

This paper explores how future tau neutrino telescopes can detect double and multiple tau bangs from cosmogenic neutrinos, providing a new way to probe Standard Model processes and potential new physics like sphalerons.

Contribution

It introduces the idea that tau bang events can serve as a novel probe for Standard Model higher-order processes and sphalerons with cosmogenic neutrinos.

Findings

Standard Model processes can produce observable double-bang events.

Double and multiple bangs can probe unknown SM physics and beyond.

Sphaleron processes can generate multiple tau bangs copiously.

Abstract

In light of the exciting campaign of cosmogenic neutrino detection, we investigate the double and multiple tau bangs detectable at future tau neutrino telescopes. Such events are expected from the Standard Model (SM) higher-order processes, which can be easily identified with broad techniques anticipated at future tau neutrino telescopes. We find that SM perturbative processes can already contribute observable double-bang events to telescopes with a sensitivity of collecting $\mathcal{O}(100)$ cosmogenic neutrino events. The detectable but suppressed rate in fact makes the double and multiple bangs an excellent probe of SM unknowns and possible new physics beyond. As a case study, the nonperturbative sphaleron process, which can copiously produce multiple tau bangs, is explored.