| Name: Soumen Roy |
| Affiliation: Indian Institute of Technology Guwahati |
| Conference ID: ASI2026_593 |
| Title: The Effect of Secret Neutrino Interaction on The KM3NeT 220 PeV Neutrino Event |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Soumen Roy(Indian Institute of Technology Guwahati, Guwahati - 781039, India), Prantik Sarmah(Institute of High Energy Physics, Beijing - 10004, China), Sovan Chakraborty(Indian Institute of Technology Guwahati, Guwahati - 781039, India) |
| Abstract: Recently, the KM3NeT has detected a $220~\mathrm{PeV}$ neutrino, the highest energetic observed till date. It is likely of extragalactic origin as no sources capable of producing such ultra-high energy (UHE) neutrinos are known to exist in the Milky Way or any nearby galaxies. Thus, this neutrino is expected to propagate over large cosmological distance before reaching Earth, thereby opening a new window to study interesting physics scenarios involving neutrino propagation. One such scenarios is the secret neutrino interaction (N$\nu$SI) of UHE neutrinos with cosmic neutrino background (C$\nu$B), mediated by a hypothetical massive scalar particle. This N$\nu$SI effect is primarily characterized by two model parameters, the coupling constant ($g_{\tau\tau}$) and the mediator mass ($M_\phi$). In this study, we analyze the bounds on this N$\nu$SI parameter space ($M_\phi$ and $g_{\tau\tau}$) considering both point and diffuse source origin for the KM3NeT neutrino event. Our analysis incorporates the impact of redshift and neutrino mass ordering. Consequently, we place the strongest constraint on the coupling constant $g_{\tau\tau}$ ($\sim 2.5 \times 10^{-3}$) for $M_\phi \sim 100~\mathrm{GeV}$. In addition, we investigate for any multimessenger correlation of the KM3NeT neutrino event with UHE photons and cosmic rays. Interestingly, our findings indicate a lack of such significant multimessenger correlations implying the possibility of an enigmatic gamma-ray dark source that emits only neutrinos at ultra high energies. |
