1,864 research outputs found

    The strong ΛbNB\Lambda_bNB and ΛcND\Lambda_cND vertices

    Get PDF
    We investigate the strong vertices among Λb\Lambda_b, nucleon and BB meson as well as Λc\Lambda_c, nucleon and DD meson in QCD. In particular, we calculate the strong coupling constants gΛbNBg_{\Lambda_bNB} and gΛcNDg_{\Lambda_cND} for different Dirac structures entered the calculations. In the case of ΛcND\Lambda_cND vertex, the result is compared with the only existing prediction obtained at Q2=0Q^2=0.Comment: 12 Pages, 3 Figures and 4 Table

    Strong couplings of negative and positive parity nucleons to the heavy baryons and mesons

    Get PDF
    The strong coupling form factors related to the strong vertices of the positive and negative parity nucleons with the heavy Λb[c][Σb[c]]\Lambda_{b[c]}[\Sigma_{b[c]}] baryons and heavy B∗[D∗]B^*[D^*] vector mesons are calculated using a three-point correlation function. Using the values of the form factors at Q2=−mmeson2Q^2=-m^2_{meson} we compute the strong coupling constants among the participating particles.Comment: 12 Pages and 7 Table

    On the strong coupling N(∗)N(∗)πN^{(*)}N^{(*)}\pi

    Full text link
    We study the strong vertices N∗NπN^*N\pi, N∗N∗πN^*N^*\pi and NNπNN\pi in QCD, where N∗N^* denotes the negative parity N(1535)N (1535) state. We use the most general form of the interpolating currents to calculate the corresponding strong coupling constants. It is obtained that the coupling associated to N∗NπN^*N\pi vertex is strongly suppressed compared to those related to two other vertices. The strong coupling corresponding to N∗N∗πN^*N^*\pi is obtained to be roughly half of that of NNπNN\pi vertex. We compare the obtained results on N∗NπN^*N\pi and NNπNN\pi vertices with the existing predictions of other theoretical studies as well as those extracted from the experimental data.Comment: 15 Pages, 4 Figures and 3 Table

    Semileptonic transition of P wave bottomonium χb0(1P)\chi_{b0}(1P) to BcB_{c} meson

    Full text link
    Taking into account the two-gluon condensate contributions, the transition form factors enrolled to the low energy effective Hamiltonian describing the semileptonic χb0→Bcℓνˉ,(ℓ=(e,μ,τ))\chi_{b0}\rightarrow B_{c}\ell\bar{\nu}, (\ell=(e,\mu,\tau)) decay channel are calculated within three-point QCD sum rules. The fit function of the form factors then are used to estimate the decay width of the decay mode under consideration.Comment: 13 Pages, 3 Tables, 4 Figure
    • …
    corecore