8 papers
Factorization of multiparticle contributions to amplitudes of B-meson weak decays
Dmitri Melikhov
We show that multiparticle contributions to amplitudes of weak decays of the generic topology (heavy quark hits some intermediate point of the propagator line joining the end-point…
On the Resonance Coupling and Width in Quantum Field Theory
Dmitri Melikhov
In quantum field theory, characteristics of resonances are related to self-energy diagrams, which are ultra-violet divergent and require renormalization. We demonstrate the proper…
Scrutinizing dark-matter scenarios with decays
Alexander Berezhnoy, Wolfgang Lucha, Dmitri Melikhov
Conceivable explanations of Belle-II measurements of a (surprising) excess of missing-energy decays of the meson to the meson not covered by standard-model neutrino-antineu…
Probing vector- vs scalar-mediator dark-matter scenarios in decays
Alexander Berezhnoy, Wolfgang Lucha, Dmitri Melikhov
Within the hypothesis of the dark-matter origin of the excess in decays over the standard-model expectation, observed by Belle-II, we show that: (i) Scalar- and vector…
Analysis of and decays in scalar- and vector-mediator dark-matter scenarios
Alexander Berezhnoy, Wolfgang Lucha, Dmitri Melikhov
The surprising excess of missing-energy events far beyond all standard-model expectations in the weak decays of the charged ground-state meson into some charged strange meson…
Nonfactorizable charming loops in exclusive FCNC decays
Dmitri Melikhov
We compare (i) nonfactorizable charm-quark loops in exclusive FCNC B-decays and (ii) three-particle contributions to the amplitude of semileptonic B-decay. Both amplitudes are give…