Recent measurements by several experimental collaborations have reported deviations from Standard Model (SM) predictions in diphoton final states, potentially hinting at the existence of intermediate scalar resonances above the electroweak scale. Such anomalies can be naturally accommodated within SM extensions featuring an enlarged scalar sector. In particular, multi-Higgs doublet frameworks...
The $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is a golden mode for flavour physics. Using data collected in 2016--2022, NA62 announced the first observation of this decay with a signal significance above $5\sigma$ and the measurement $B(K^{+}\rightarrow\pi^{+}\nu\bar{\nu}) = \left(13.0^{+ 3.3}_{- 3.0} \right)\times10^{-11} $. New results from the analysis of the 2023--2024 dataset are...
Belle II has reported a $2.7\sigma$ excess in $B^+\to K^+\nu\bar\nu$ over its Standard Model prediction, recently interpreted as arising from an axion-like particle mediating a thermal dark matter candidate. We reassess this interpretation using a new mass-differential measurement of the same data set and adding two visible-decay searches that earlier analyses omitted. The resulting bounds...
The combination of cosmic microwave background (CMB) measurements with distance measurements from baryon
acoustic oscillations (BAO) and type Ia supernovae (SNIa) suggests that dark energy is dynamical, with an equation of
state crossing the phantom divide at low redshifts. This feature can not be described within canonically normalized,
minimally coupled, self-interacting scalar field...
As an accelerator-based long-baseline neutrino experiment studying neutrino oscillations, NOvA has been searching for signals of beyond the Standard Model (BSM) physics like sterile neutrinos and non-standard interactions (NSI) with matter, setting constraints on the parameters governing those new-physics phenomena. In addition, we are also investigating NOvA's capabilities to observe the...
Within the CKM phenomenological matrix, the class of unmixed quarkfield
phase transformations to the top-bottom phase give around π/2. This
value is derived from 1) electroweak and heavy-quark mass connections [Phys.
Rev. D 99, 073001 (2019)] through the common Higgs operator, as the boson
fields’ discrete degrees of freedom can be equivalently represented in terms of the
fermions’, given...
We explore the paradigm of "Chiral Dark Matter" based on minimal, anomaly-free gauge extensions of the Standard Model. We demonstrate how enforcing exact local anomaly cancellation in a secluded sector autonomously dictates the dark particle spectrum. Spontaneous symmetry breaking within this chiral framework naturally stabilizes the dark matter candidates.
TAMBO-4 is a compact array developed as an initial prototype for the Tau Air-Shower Mountain-Based Observatory (TAMBO), a future experiment designed to detect Earth-skimming astrophysical tau neutrinos through extensive air showers in the Colca Valley, Arequipa, Peru. The detection of tau neutrinos in the PeV energy range with TAMBO is essential for multimessenger astrophysics, flavor physics,...
We present the first determination of the magnetic dipole moment of the $\rho$ and $K^*$ vector mesons, based on data from the BaBar Collaboration. We analyze the $e^{+} e^{-} \to \pi^+ \pi^- 2 \pi^0$ and $e^{+} e^{-} \to K^+ K^- 2 \pi^0$ processes which are sensitive to this parameter. We describe the $\gamma^* \to hadrons$ vertex using a vector meson dominance model, including the relevant...
The scotogenic model offers an attractive framework that explains light neutrino masses while accommodating a viable dark matter candidate. In this work, we study the phenomenology of singlet fermion dark matter, $N_1$, produced via the freeze-in mechanism characterized by an instantaneous low reheating temperature, $T_{\text{rh}}$.
We explore the model's viable parameter space,...
We present a selection of results from the light and heavy ion physics programs of the CMS experiment, with an emphasis on recent measurements from the LHC Run 3 data.
We investigate longitudinal nuclear suppression in relativistic heavy-ion collisions using the observable (R_(dN⁄dy)), defined as the binary-collision-scaled ratio of rapidity distributions in Pb–Pb and p–p interactions. Numerical studies with EPOS, FTFP_BERT, and HIJING reveal notable model dependence: FTFP_BERT and HIJING reproduce the experimentally observed increase in the ratio toward...
Despite the Standard Model’s great success in describing fundamental particles and their interactions, it fundamentally lacks a dark matter particle candidate to account for the Universe’s observed relic abundance. Furthermore, the mechanism responsible for generating neutrino masses remains one of the Standard Model’s enduring mysteries. In many compelling extensions, both dark matter...
t has been theorized that proto-magnetars are born possesing high temperatures (around 50 to 100 MeV), rich in leptons (electrons and neutrinos out of beta equilibrium with a fraction of 0.4 per baryon), and with extremely intense magnetic fields (around 10^18 Gauss). This makes them unique astrophysical laboratories to investigate the properties of dense nuclear matter under extreme...
Lepton-number-violating (LNV) meson and tau decays provide complementary probes of new physics that violate lepton number by two units. Below the electroweak scale, short-range contributions mediated by heavy particles can be described by a dimension-9 low-energy effective Lagrangian. While operators involving first-generation fermions are strongly constrained by neutrinoless double beta...
The discovery of charged lepton flavor violation (cLFV) would provide incontrovertible evidence for physics beyond the Standard Model. Among the various cLFV channels, photon-photon interactions offer a remarkably clean probe of electromagnetic phenomena. In this work, we explore the prospects of searching for the cLFV process $e^+ e^- \to e^+ e^- e \mu$ at future circular colliders (CEPC and...
I discuss baryon formation in the early Universe in a confining SU(N) gauge theory containing quarks with masses well below the confinement scale and transforming in the fundamental representation of the gauge group. Assuming Casimir scaling of the confining potential between static SU(N) charges, I show that baryon formation is hindered by a Casimir bottleneck: for small quark clusters,...
Using a statistical model, we analyze published multiplicity distributions for identified hadrons produced in heavy ion collisions in the energy range from 2.7-200 GeV. Our analysis enables the prediction of the multiplicity distributions for multi-strangeness hadrons that have not yet been measured in lower-
energy experiments. Furthermore, we obtain freeze-out parameters, including...
Reducing the number of free parameters while retaining the ability to explain the observed phenomenology of the lepton sector remains an important task in flavor physics. In particular, viable theoretical frameworks must reproduce the measured neutrino mass squared differences and mixing angles, while providing predictions or constraints on the still not fully determined CP violating phase. In...
