Research (prof. dr. Sasa Prelovsek Komelj)
(name used for publications: Sasa Prelovsek)
recent talks
Current Ph.D. students: Mitja Sadl, Ivan Vujmilović
Research interests:
theoretical aspects of elementary particle physics
quantum field theory on the lattice
Quantum Field Theory on the Lattice is essential for the theoretical studies of Quantum Field Theories where coupling constant is not small. In this case, most of hadronic properties can not be calculated by conventional perturbative expansion via summation of Feynman diagrams. A prime example in the Standard Model is Quantum Chromodynamics, which is the fundamental theory of interactions between quarks and gluons. Quantum Chromodynamics on the Lattice is based directly on the Chromodynamics and the only parameters are those that already appear in the fundamental theory: quark masses and the strong coupling constant. In this case, the hadron properties are calculated by numerical evaluation of Feynman path integrals on finite and discretized space-time - i.e. lattice. Several interesting theories beyond the Standard Model also contain new forms of strong interactions that require non-perturbative approaches like lattice simulations.
Current research interest:
hadronic properties using Quantum ChromoDynamics on the Lattice
Quantum ChromoDynamics (QCD) is a theory of strong interactions between quarks, which are the basic building blocks of the Nature.
Topics currently explored using lattice QCD:
- interactions between hadrons
- phase shifts for scattering between hadrons
- hadron resonances that can decay strongly: determination of the masses and the widths
- bound states between hadrons
- tetraquarks and mesonic molecules
- hadrons under study: light mesons, strange mesons, charmed mesons, charmonium and charmonium-like states
- employing quark-antiquark and multi-hadron interpolating fields
- analytic derivation of relations that relate spectrum and phase shifts
Topics previously exploreded using lattice QCD:
- spectroscopy
- tetraquarks
- scalar mesons
- effects on unphysical approximations to scalar correlator
- effects of quenching, partial quenching, mixed actions, staggered fermions
- analytical study of these effects in effective field theories
- analytical determination of chiral and finite volume behavior for semileptonic B->pi form factors
- meson wave functions
Focus on during PhD: searching for New Physics in rare charm decays
Explored with non-lattice theoretical tools:
- looking for charm processes that could be sensitive for New Physics beyond Standard Model
- flavor changing processes in charm sector
- radiative, non-leptonic and semileptonic decays charm meson decays
- short and long distance contributions to hadronic observables
- theoretical tools for hadrons: effective field theories ChPT, HQET
- beyond SM models considered: Supersymmetry, Little Higgs model
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