Baryon and lepton number are excellent low-energy symmetries of the Standard Model (SM) that tightly constrain the form of its extensions. In this work, we investigate the possibility that these accidental symmetries are violated in the deep UV, in such a way that one multiple necessary for their violation lives at an intermediate energy M above the electroweak scale. We write down the...
A longstanding mismatch of the theoretical predictions and experimental measurements of $D$-meson mixing parameters stands at a couple orders of magnitude. The Glashow–Iliopoulos–Maiani (GIM) mechanism is responsible for the cancellations which leave $SU(3)$ breaking effects highly suppressed - to the fourth power. Higher order corrections, as well as nonperturbative effects, may give rise to...
In this poster, we present an in-depth investigation of the recently found issues in the FxFx matching-merging procedure in MadGraph5_aMC@NLO for usage at the LHC. We compare the predictions for $W+3$ jets and $Z+3$ jets against corresponding measurements from ATLAS and CMS, studying a variety of final-state kinematic distributions and highlighting regions where mismatches are most pronounced....
The study of cosmological first order phase transitions, and the associated gravitational wave signal, has seen growing interest in recent years, driven by the prospects of detection with next-generation ground- and space-based interferometers.
Here, I present PT2GWFinder, a Mathematica package designed to compute phase transition parameters and the gravitational wave power spectrum for an...
We revisit the computation of the electroweak vacuum decay rate in the Standard Model, incorporating the full one-loop prefactor and focusing on the gauge degrees of freedom. Using group theoretical arguments, we derive the correct degeneracy factors in the functional determinant and identify an overcounting of transverse modes in previous calculations. The new result modifies the gauge...
We present a theoretical background of heavy hadron decays within the heavy quark expansion and phenomenological implications to lifetimes of doubly charmed baryons by including available NLO QCD corrections and newly computed terms in the 1/m_c series. Heavy hadron decays are treated using the effective weak hamiltonian and perturbative and nonperturbative effects are decoupled into effective...
Presentation of a newly develop tool for the purposes of inclusive reconstruction of charmed hadrons at the Belle II experiment and its potential use in future measurements.
We investigate the false vacuum decay rate of a real scalar field theory in 2, 3, and 4 spacetime dimensions, incorporating quantum corrections at the one-loop level. This process, crucial for understanding phenomena such as metastable states in quantum field theory, phase transitions in the early universe, and critical behavior in condensed matter systems, is typically described using...
The determination of the $DD^{*}$ scattering amplitude from lattice QCD is complicated by long-range interactions. In particular, the scattering amplitude exhibits a left-hand branch cut in the kinematical region where several states from lattice simulations appear, requiring careful treatment. We tackle this problem by adopting plane-wave and effective-field-theoretic methods, which also...
