Analysis of DsDK∗D_s D K^* and DsD∗K∗D_s D^{*} K^* vertices and branching ratio of B+→K∗0π+B^+\to {K^*}^0 \pi^+

In this paper, the strong form factors and coupling constants of $D_sDK^*$ and $D_sD^*K^*$ vertices are investigated within the three-point QCD sum rules method with and without the $SU_{f}(3)$ symmetry. In this calculation, the contributions of the quark-quark, quark-gluon, and gluon-gluon condensate corrections are considered. As an example of specific application of these coupling constants, the branching ratio of the hadronic decay $B^+\to {K^*}^0 \pi^+$ is analyzed based on the one-particle-exchange which is one of the phenomenological models. In this model, $B$ decays into a $D_s D^*$ intermediate state, and then these two particles exchange a $D (D^*)$ producing the final $K^*$ and $\pi$ mesons. In order to compute the effect of these interactions, the $D_s D K^*$ and $D_s D^* K^*$ form factors are needed.Comment: 14 pages, 8 figures. arXiv admin note: substantial text overlap with arXiv:1509.0171

Coupling constants of bottom (charmed) mesons with pion from three point QCD sum rules

In this article, the three point QCD sum rules is used to compute the strong coupling constants of vertices containing the strange bottomed ( charmed ) mesons with pion. The coupling constants are calculated, when both the bottom ( charm ) and pion states are off-shell. A comparison of the obtained results of coupling constants with the existing predictions is also made. Key words: strong coupling constant, meson, QCD sum rules, bottom, charm.Comment: 17pages, Latex. arXiv admin note: text overlap with arXiv:1104.2864, arXiv:1103.0943, arXiv:hep-ph/0304193 by other author

Analysis of Ds∗D∗K∗D^*_sD^*K^* and Ds1D1K∗ D_{s1} D_1 K^* vertices in three-point sum rules

In this study, the coupling constant of $D^*_sD^*K^*$ and $D_{s1}D_1K^*$ vertices were determined within the three-point Quantum chromodynamics sum rules method with and without consideration of the $SU_{f}(3)$ symmetry. The coupling constants were calculated for off-shell charm and K$^*$ cases. Considering the non-perturbative effect of the correlation function, as the most important contribution, the quark-quark, quark-gluon, and gluon-gluon condensate corrections were estimated and were compared with other predictive methods.Comment: 12 pages, 5 figure

Calculation of hyperfine coupling constant and the g tensor of alanine radicals at different crystal temperatures based on Density Functional Theory (DFT)

In this paper, Density Functional Theory (DFT) was utilized for the calculation of the hyperfine coupling constant and the g tensor alanine radicals at different crystal temperatures. The cluster approach was used for considering the effects of crystal environment. In the cluster approach, the careful selection of the cluster size is very important for the geometry structure of alanine and the EPR parameters of alanine radicals. The geometry structure of alanine and the EPR parameters of alanine radicals showed a good agreement with the experiment data when 6 alanine molecules had hydrogen bonds with the central alanine or alanine radicals. Further, bigger clusters could even lead to an incorrect description of the geometry structure of alanine and EPR parameters of alanine radicals in the condensed phase