Seminar on the topic: Neutrino Mass Models, Z’ Boson Constraints, and Platinum EXAFS Thermodynamics

At 2:00 p.m. on August 22, 2025,  IAST organized an academic exchange session at at Room 604 - Office of the Institute for Advanced Study in Technology in Hanoi, 99 Tran Quoc Toan, Cua Nam, Hanoi with the following detailed content:

1/ Dr. Vu Hoa Binh reported on the topic "Neutrinos masses in the ALP331 and 331RISS models"
Abstract:

We propose two models based on the SU(3)C × SU(3)L × U(1)X gauge symmetry, each incorporating distinct inverse seesaw mechanisms for generating neutrino masses at the radiative level. Therefore, neutrino masses are suppressed by the radiative nature of the mass generation mechanism, which occurs after the spontaneous breaking of the global lepton number symmetry. Both scenarios discussed here are characterized by the presence of vector-like charged leptons, which are involved in generating the masses of the Standard Model charged leptons.

2/ Dr. Dinh Thanh Binh reported on the topic "Coherent neutrinos scattering constraints on Z' boson mass in extended models"
Abstract:

We investigate the coherent-elastic neutrino-nucleus scattering (CEνN S) in the effective 3-3-1 models. We show that the number of events predicted by 331 models is in agreement with the data given by COHERENT experiment. We evaluate the sensitivity of the mass of Z ′ boson for CsI and liquid Argon subsystem detector. We obtained mZ′ ≥ 1.4TeV for CsI detector and mZ′ ≥ 2.3 TeV for liquid Argon detector with 90% CL. Our results are in agreement with electroweak and dark matter constraints of Z' boson mass and indicate that low-energy high-intensity measurements can provide a valuable probe, complementary to high energy collider searches at LHC.

3/ PhD. Le Duy Manh reported on the topic "Effect of Thermal Disorder on Thermodynamic Parameters of Platinum in Anharmonic Expanded X-Ray Absorption Fine Structure Theory"
Abstract:

The thermodynamic parameters of crystalline platinum (Pt) in the anharmonic Extended X-ray Absorption Fine Structure (EXAFS) theory are analyzed, considering thermal disorder effects. Using a quantum-statistical perturbation theory and the correlated Einstein model with an effective potential method, we calculated parameters including the anharmonic effective potential, interatomic distances, thermal expansion coefficient, first four EXAFS cumulants, phase shift, and amplitude reduction. Thermal disorder, driven by quantized phonon vibrations and anharmonic phonon–phonon interactions, influences these parameters. The obtained temperature-dependent expressions can satisfy all their fundamental properties in both low- and high temperature regions. The numerical results of Pt fit with those obtained from the experimental data and other calculation models at various temperatures ranging from 0 to 900 K. The results show that the present theoretical model can efficiently investigate the anharmonic EXAFS parameters of Pt under the effect of thermal disorder.