A5089057378- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
Charles University
2018-2023
Institute of Particle Physics
2019
The anomalies in the $B$-meson sector, particular $R_{K^{(*)}}$ and $R_{D^{(*)}}$, are often interpreted as hints for physics beyond Standard Model. To this end, leptoquarks or a heavy $Z'$ represent most popular SM extensions which can explain observations. However, adding these fields by hand is not very satisfactory it does address big questions like possible embedding into unified gauge theory. On other hand, light within framework challenging due to additional constraints such lepton...
We demonstrate that in a recently proposed unified leptoquark model based on the gauge group $SU(4)_C\times SU(2)_L \times U(1)_R$ significant deviations from Standard Model values of $R_K$ and $R_{K^*}$ can be accommodated without any need extra heavy fermions. Low energy data, particular lepton flavour violating $\mu$ decays $K_L\to e \mu$, severely constrain available parameter space. show allowed part space (i) some lepton-flavour-violating tau decay branching ratios are predicted to...
We study possible current and future low-energy signals of the gauge leptoquark in quark-lepton $SU(4)$ unification \`a la Pati-Salam. Taking fully into account freedom generation mixing between quarks leptons, we compile a catalog observables which currently form border excluded part parameter space---hot candidates for first new physics. also determine sensitivity needed order to inspect allowed space several other measurements are not included this catalog. improve older similar works on...
A large hierarchy between the electroweak scale and virtually any new of beyond-Standard-Model physics is often claimed to be unnatural.Sometimes, apparent disparity measured Higgs mass size typical loop corrections encountered within such schemes even interpretted as a profound indication that one should expect remedy just behind corner, probably in form low-scale supersymmetry, strong dynamics etc.In reality, all potentially one-and two-point Green's functions cancel with each other...
We study possible current and future low-energy signals of the gauge leptoquark in quark-lepton SU(4) unification à la Pati-Salam. Taking fully into account freedom generation mixing between quarks leptons, we compile a catalogue observables which currently form border excluded part parameter space - hot candidates for first new physics. also determine sensitivity needed order to inspect allowed several other measurements are not included this catalogue. improve older similar works on topic...
Quark-lepton $SU(4)$ symmetry is an appealing paradigm, a step towards grand unification. It has been identified decades ago that the minimal potentially realistic models with quark-lepton have $SU(4)\times SU(2)\times U(1)$ gauge structure and naturally contain both scalar leptoquarks. Such thoroughly studied by several authors. In recent years, lot of interest aroused experimental hints lepton flavour universality violation (LFUV) in $B$-meson decays. These are often interpreted as signals...