2023/07/22 by Guoyuan Huang, Huang, Guo-yuan · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Radio Astronomy Observations and Technology
paper · pdf · doi:10.48550/arxiv.2307.12153
openalex publication_date 2023/07/22 · openalex created_date 2023/07/26 · openalex updated_date 2026/07/28
The in-ice or in-water Cherenkov neutrino telescope such as IceCube has already proved its power in measuring the Glashow resonance by searching for the bump around E\rm ν = 6.3~\rm PeV arising from the W-boson production. In the next few decades, there are many proposals that observe cosmic tau neutrinos with extensive air showers, also known as tau neutrino telescopes. As has been recognized, the air shower telescope is in principle sensitive to the Glashow resonance via the channel W → τντ followed by the tau decay in the air. However, with a thorough numerical analysis we have identified several limitations for those telescopes on hunting the resonance. If ultrahigh-energy neutrinos are dominantly produced from the meson decay, it will be statistically difficult for a rather advanced proposal, such as TAMBO with a geometric area around 500~\rm km2, to discriminate the Glashow resonance induced by νe from the intrinsic ντ/ντ background. The discovery significance is only around 1σ considering the flux parameters measured by IceCube as the input. Nevertheless, the significance will be improved to 90% if PeV neutrinos mainly originate from the neutron decay, which is, however, thought to be only a subdominant neutrino source. The presence of new physics can also increase the significance. Compared to the in-ice or in-water telescope, the challenge for the Glashow resonance search is ascribed to several factors: (i) a suppressed branching ratio of 11% for the decay W → τντ; (ii) the smearing effect and the reduced acceptance because the daughter neutrino takes away ⟨ y ⟩ ∼ 75% of the energy from the W decay; (iii) a large attenuation effect for Earth-skimming neutrinos with the resonance.