I have proposed a simple model with (light) dark matters (DMs)
that interact with leptons via Yukawa couplings, with S. Okawa and S. Iguro.
The DMs can evade strong bounds from the DM direct detection experiments
and predict some specific signals at the LHC. In this talk, I review the work shortly, and
introduce a model with $SU(3)\times SU(2)_L \times SU(2)_R \times U(1)_{B-L} $ gauge...
Photons can mix with low-mass bosons in the presence of external electromagnetic fields. A known example is the hypothetical axion (spin 0) which can couple with the photon by a two-photon vertex. Other axion-like particles (ALP) have been proposed in many Beyond Standard Model (BSM) theories. In this talk we give a brief overview of the physics of axion and discuss the possibility of...
In the theory with a Majorana fermion coupled to quarks via a dimension-six four-fermion vector-vector interaction, we show that the observed baryon asymmetry of the Universe can be generated in the decay and scattering processes in the expanding early Universe. In viable parts of parameter space we discuss the observability of neutrino-antineutron oscillation in upcoming experiments.
In recent years, very weak interactions on the MeV scale, in particular the case of U(1) Lmu-Ltau, have attracted significant attention in the context of muon g-2, dark matter-mediated forces and others. This presentation will focus on how the extension of this U(1) symmetry to five dimensions can be explored in future new physics search experiments, concretely, the DUNE experiment and future...
In this talk I will give a detailed beyond standard model phenomenology inspired by singlet-doublet vector-like fermion dark matter. In particular, realization of radiative neutrino mass (Dirac as well as Majorana), anomalous g-2, W-mass anomaly, TeV-scale leptogenesis, dark matter self-interaction etc.
The knowledge of the Higgs potential is crucial for understanding the origin of mass and the thermal history of our Universe. We show how collider measurements and observations of stochastic gravitational wave signals can complement each other to explore the multiform scalar potential in the two Higgs doublet model. In our investigation, we analyze critical elements of the Higgs potential to...
In this talk, I will discuss the physics potential of ESSnuSBplus setup on behalf of the ESSnuSB collaboration. ESSnuSB is an upcoming neutrino oscillation experiment to be based in Sweden. The ESSnuSBplus set up will consist of three neutrino sources i.e., the main neutrino beam from the ESS linac, low energy neutrinos from a monitored beam (LEMNB), and low energy neutrinos from a muon...
Large SU(3) breaking has been observed in some hadronic B decays. This observation may eventually pave the way for challenging Standard Model inspired hypotheses in these decay modes. I will provide an update on these hadronic anomalies. I will include additional decay channels that may also shed light on this new puzzle.
CP-violation is essential for understanding the matter-antimatter asymmetry in the Universe and serves as a key component of physics beyond the Standard Model (SM). Extensions in the Higgs sector permit CP violations beyond the CKM phase. However, the origin of CP-violation remains unknown, as both spontaneous and explicit violations are feasible. In this talk, I present the phenomenological...
I will present a variant of the 3HDM, referred to as the BGL-3HDM, incorporating a horizontal U(1)×U(1) symmetry, which can distinguish the primary sources of mass for different fermion generations. In the version considered here, the Yukawa matrices in the down-quark and charged lepton sectors are diagonal, thereby eliminating tree-level FCNCs in these sectors. FCNC interactions mediated by...
New Physics, if weakly coupled to the Standard Model, is often easier to search at the electron-positron machines, than at the LHC. In this talk, I will discuss a few examples concerning dark matter, Higgs effective operators, lepton number and flavor violating interactions.
In this talk, I will discuss the impact of preheating on baryogenesis in Higgs-Starobinsky inflation. I will show that if the Ricci scalar couples with the U(1) hypercharge density, it can explain the observed matter-antimatter asymmetry of the Universe.
A color octet isodoublet can have esoteric origins and it complies with minimal flavour violation. In this study, we take a scenario where the well known Type-X Two-Higgs doublet model is augmented with a color octet isodoublet. We shed light on how such a setup can predict the recently observed value for the W-boson mass. The two-loop Barr-Zee contributions to muon g-2 stemming from the...
"Dark matter direct detection is now standing at an interesting juncture, where the SM neutrino background and the upper bound on dark matter signal cross section are starting to overlap in a region of DM mass $\sim 10$~GeV.
The neutrino floor, which defines the extent of the neutrino background, can get modified in different BSM set up. We work in a BSM set up that is a very natural dark...
We analyze various dark matter models featuring additional scalars and fermions. The scalar quartic and Yukawa couplings play key roles in achieving the correct relic density via Freeze-out and Freeze-in mechanisms. In addition to the SM-like high-scale minimum along the Higgs direction, new minima can arise along the extended scalar direction, depending on the dark matter parameter space. We...
Flavor experiments commissioned to provide precise measurements of the Standard Model (SM) parameters are excellent laboratories to look for hypothesised particles, especially those with masses less than a GeV. In this talk, I discuss some experiments related to semi-leptonic charged current amplitudes, which can be veritable smoking guns for axion-like particles (ALPs). I show that the...
