Speaker: Mr. ShivaSankar K.A. (Hokkaido University)
Talk title: Neutrinos: A Tale of Two Identities
Time: 2025/04/07 (Mon.) 12:30
Place: NCTS Physics 4F Lecture Hall, Cosmology Hall, NTU

Abstract: 
The nature of neutrino mass remains one of the most significant mysteries in particle physics, suggesting the existence of physics beyond the Standard Model. A simple yet profound extension involves Right-Handed Neutrinos (RHNs), which could either be Dirac or Majorana particles. Understanding this distinction is crucial for unveiling the fundamental properties of neutrinos. In this talk, I will explore how we can probe RHNs within the Standard Model Neutrino Effective Field Theory (SMNEFT), where RHNs interact with Standard Model particles via higher-dimensional operators. I will specifically focus on how RHNs, produced in meson decays at the LHC, can be detected through their decays inside the FASER detector. By analyzing the distributions of decay products, we identify distinguishing features between Dirac and Majorana neutrinos. I will present the theoretical framework and our approach for quantifying this distinction, as well as discuss the potential sensitivity of FASER in probing the nature of RHNs.