We explored most general effective operators contributions of New Physics operators to the B › D*?? Ż? decay amplitudes by determining the differential decay rate, longitudinal D* polarization fraction, D* - ? opening angle asymmetry and the ? helicity asymmetry. We identified the size of possible new physics contributions to these observables constrained by the present B › D(*)?? Ż? rate measurements and find significant modifications are still possible in all of them.
COBISS.SI-ID: 25811495
The review article compiles relevant results from leptoquark phenomenology, which connects theoretical predictions in leptoquark models to the experimental searches at particle colliders. We have presented the limits on leptoquark masses and couplings due to constraints from precise low-energy measurements, such as electrical and magnetic dipole moments, atomic parity violation, neutral meson mixing, meson decays, and rare lepton decays. At the high energy frontier we have underlined complementarity between precise measurements of electroweak processes, top quark physics and Higgs boson decays. Finally we have also reviewed the theoretical and experimental status in direct searches for leptoquarks in colliders. The review will help in guiding the community in leptoquark searches. Their experimental discovery would be of fundamental importance for physics beyond the Standard model.
COBISS.SI-ID: 29636903
We proposed a novel way to search for the breaking of lepton number in exotic Higgs decays at the LHC. In the context of the minimal Left-Right symmetric model, where neutrino mass results from spontaneous breaking, we showed that the Standard Model Higgs can decay to a pair of right-handed neutrinos. This results in a signal with same-sign leptons and jets that can be searched for at the LHC. Collider simulation with a sensitivity study shows this may be a very sensitive probe of new physics.
COBISS.SI-ID: 28795175
Conventional hadrons are composed of three valence quarks (baryons) and valence quark-antiquark pair (mesons). Belle collaboration discovered an interesting state X(3872) in 2003, which is most likely a mesonic molecule D\bar D^* . In spite of many attempts to provide theoretical evidence for the existence of this interesting state, results in this paper presented the first unambiguous evidence for its existence within ab-initio lattice QCD calculation. We found a state in a dynamical simulation of scattering D\bar D^* . The analysis of the extracted scattering matrix indicates a pole just below D\bar D^* threshold. We relate this pole to the experimental near-threshold state X(3872). The detailed study of the composition of the resulting state indicates a large D\bar D^* component, as supported by the previous phenomenological studies claiming that this is a mesonic molecule.
COBISS.SI-ID: 2613348
We analysed the experimental hints of a di-photon resonance at the LHC in terms of a new boson, extracting information on its properties and exploring theoretical interpretations.
COBISS.SI-ID: 29401383
We examined new physics interpretations of recently observed lepton flavor universality violations in B decays.
COBISS.SI-ID: 26186535
We speculated about the possible interpretations of the recently observed excess in the h›?µ decay.
COBISS.SI-ID: 28675111
We showed that within new physics models addressing the charm CP violation puzzle, sizeable direct CP asymmetries in radiative D decays can be expected.
COBISS.SI-ID: 26206759
We confronted the indications of lepton flavor universality (LFU) violation observed in semi-tauonic B meson decays with new physics (NP) searches using high pT tau leptons at the LHC. We found that, in general, ?+?- searches pose a serious challenge to NP explanations of the LFU anomaly.
COBISS.SI-ID: 29977127
A good fit of the fermion masses and mixings has been found in the minimal renormalizable supersymmetric SO(10). This solution needs a strongly split supersymmetry breaking scenario with gauginos and higgsinos around 100 TeV, sfermions close to 10^14 GeV and a low GUT scale of around 6 10^15 GeV. We predict fast proton decays through SO(10) type of d=6 operators and the leptonic mixing angle theta_13 approximately 0.1.
COBISS.SI-ID: 22151463