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We observe a strong variation of the Zeeman splitting of exciton polaritons in microcavities when switching between the linear regime, the polariton lasing, and photon lasing regimes. In the polariton lasing regime the sign of Zeeman splitting changes compared to the linear regime, while in the photon lasing regime the splitting vanishes. We additionally… (More)
Using the quark-antiquark interactions obtained in the framework of the bootstrap method we construct a potential model, investigate the possibility of describing of heavy quarkonia and calculate the bot-tomonium spectrum. The potential of the interaction was obtained as a nonrelativistic limit of the relativistic quark-antiquark amplitudes Q ¯ Q → Q ¯ Q.
We report exciton-polariton laser operation under electrical pumping. The hybrid light-matter nature of this lasing system is probed by measuring the exciton-polariton Zeeman-splitting, which clearly reveals that this laser remains in the strong coupling regime.
The electromagnetic form factors of tetraquarks are calculated in the framework of relativistic quark model at small and intermediate momentum transfers Q 2 ≤ 1 GeV 2. The charge radii of X(3872) and X(3940) tetraquarks are determined.
Masses of the lowest multiplets of c, b-mesons in Sand P-wave states with quantum numbers J P C : 0 −+ , 1 −− , 0 ++ , 1 +− , 1 ++ , 2 ++ are obtained with the help of dispersion N/D method of heavy quark effective theory. The results are in a good agreement with experimental data. Radiative decay widths for some states mentioned above were calculated.