Solar neutrinos provide crucial insights into the Sun’s fusion processes and neutrino oscillations in matter. However, detecting them requires effective suppression of backgrounds. One of these is spallation backgrounds—beta decays of unstable isotopes produced by cosmic-ray muons— which pose a major challenge above 6 MeV. We show that neutron tagging, made possible by the recent addition of...
We investigate primordial non-Gaussianity (NG) that arises from explicit $U(1)$ symmetry-breaking interactions during inflation, focusing on a nearly massless axial component of a complex scalar field $P$. We compute the resulting NG parameter $f_{\mathrm{NL}}$, allowing the axial field to act as either a curvaton or cold dark matter (CDM). We consider two scenarios in which the interaction...
We introduce and investigate the effects of a light scalar interacting with the
short-lived kaon and the KS → μ+μ− decay. We use the results of searches performed at
kaon factories as well as the Standard Model predictions for this decay to constrain the
couplings of a ϕ particle with a mass mϕ of the order of MeV. In addition to this we find
the allowed parameter space for further CP...
We present the first complete two-loop calculation of the electric dipole moment of the electron, as well as the rates of the lepton-flavor violating decays μ→e+γ and τ→e/μ+γ, in the unconstrained two-Higgs doublet model. We include the most general Yukawa interactions of the Higgs doublets with the Standard Model fermions up to quadratic order, and allow for generic phases in the Higgs...
We explore the generation of primordial black holes (PBHs) and second-order induced gravitational waves (GWs) arising from underdamped isocurvature fluctuations of an axion-like curvaton field. During inflation, the radial component of the curvaton undergoes underdamped evolution, leading to a resonant amplification of the curvaton's quantum fluctuations. This mechanism imprints...
