### Conveners

#### Parallel: BSM Theories and Flavor Physics

- Sang Hui Im (Center for Theoretical Physics of the Universe, Institute for Basic Science, Korea)

The recently suggested Festina-Lente (FL) bound provides a lower bound on the masses of U(1) charged particles in terms of the positive vacuum energy. Since the charged particle masses in the Standard Model (SM) are generated by the Higgs mechanism, the FL bound provides a testbed of consistent Higgs potentials in the current dark energy-dominated universe as well as during inflation. We study...

We investigate the pseudo-Nambu-Goldstone bosons (pNGBs) potential in the geometrical point of view.

In this talk I will discuss how to essentially organise or structurally understand the pNGB potential without recourse to the UV symmetries.

We analyze the mass spectrum of the charged and neutral Higgs bosons in the framework of two Higgs doublet model (2HDM) in the light of the precision measurement of the $W$ boson mass by the CDF collaboration. We have considered the most general 2HDM potential with explicit CP violation in the Higgs basis which contains the three CP-mixed neutral mass eigenstates $H_1$, $H_2$, and $H_3$ with...

The dark Z boson is a new vector particle induced by an additional Abelian gauge symmetry. It interacts with the SM fermions via kinetic and mass mixings and provides a new source of parity violation. It is known that such a parity-violating effect can be tested by future precious measurements of the weak mixing angle at low energies. In this talk, we discuss the effect of the dark Z boson on...

We proposed models in which the hierarchical structure of the quark and lepton masses and mixing are explained by the $S_4^\prime$ modular flavor symmetry. This is the first explicit example which realizes all of the mass and mixing hierarchies from a single modular symmetry. The hierarchies are predominantly explained by the Froggatt-Nielsen mechanism due to the residual $Z_4^T$ symmetry,...

The effects of a scalar field, known as the “assistant field,” which nonminimally couples to gravity, on single-field inflationary models are studied. The analysis provides analytical expressions for inflationary observables such as the spectral index (𝑛𝑠), the tensor-to-scalar ratio (𝑟), and the local-type nonlinearity parameter (𝑓𝑁𝐿(𝑙𝑜𝑐𝑎𝑙)). The presence of the assistant field leads to a...

A new world average calculated using the data from Belle, BaBar, and LHCb collaborations in 2022 yielded $R_{D}^{ave}=0.358\pm 0.028$ and $R_{D^*}^{ave}=0.285\pm 0.013$. The combined new world average has the largest pull of $4.1\sigma$ from SM predictions after incorporating all the recent developments in $B\rightarrow D^{(*)}$ that include form factors for predicting $R_{D^{(*)}}^{SM}$....