Article

Final state interaction in B0 → D+sD−s

Journal of High Energy Physics (Impact Factor: 5.62). 01/2012; 39(4). DOI:10.1088/0954-3899/39/4/045004

ABSTRACT In this research, the hadronic decay of B0 → D+sD−s is analyzed using the ‘QCD factorization’ (QCDF) method and final state interaction (FSI). First, the B0 → D+sD−s decay is calculated via the QCDF method and the annihilation graphs exist only in this method. Hence, the FSI must be seriously considered to solve the B0 → D+sD−s decay, and the D+D−(D+*D−*), , K+K−(K+*K−*), and ϕϕ via the exchange of K0(*), K−(*), , D−(*) and D−(*)s mesons, respectively, are chosen for the intermediate states. To estimate the intermediate state amplitudes, the QCDF method is again used. These amplitudes are used in the absorptive part of the diagrams. The experimental branching ratio of the B0 → D+sD−s decay is less than 3.6 × 10−5, and our results according to the QCDF method and FSI are 0.31 × 10−5 and 3.01 × 10−5, respectively.

0 0
·
0 Bookmarks
·
6 Views
• Source
Article: Phenomenology of heavy meson chiral lagrangians
[hide abstract]
ABSTRACT: The approximate symmetries of Quantum ChromoDynamics in the infinite heavy quark (Q = c, b) mass limit (mQ → ∞) and in the chiral limit for the light quarks (mq → 0, q = u, d, s) can be used together to build up an effective chiral lagrangian for heavy and light mesons describing strong interactions among effective meson fields as well as their couplings to electromagnetic and weak currents, including the relevant symmetry-breaking terms. The effective theory includes heavy () mesons of both negative and positive parity, light pseudoscalars, as well as light vector mesons. We summarize the estimates for the parameters entering the effective lagrangian and discuss in particular some phenomenologically important couplings, such as . The hyperfine splitting of heavy mesons is discussed in detail. The effective lagrangian allows for the possibility to describe consistently weak couplings of heavy (B, D) to light () mesons. The method has however its own limitations, due to the requirement that the light meson momenta should be small, and we discuss how such limitations can be circumvented through reasonable ansatz on the form factors. Flavour conserving () and flavour changing () radiative decays provide another field of applications of effective lagrangians; they are discussed together with their phenomenological implications. Finally, we analyze effective lagrangians describing heavy charmonium- like (Q̄Q) mesons and their strong and electromagnetic interactions. The role of approximate heavy quark symmetries for this case and the phenomenological tests of these models are also discussed.
Physics Reports. 01/1997;
• Article: Heavy-quark symmetry and chiral dynamics
[hide abstract]
ABSTRACT: The flavor and spin symmetry of the heavy quarks and the spontaneously broken approximate SU(3)L×SU(3)R chiral symmetry of the light quarks are exploited to formulate a theory describing the low-energy interactions of the heavy mesons (Qq̅ bound states) and heavy baryons (Qq1q2 bound states) with the Goldstone bosons π, K, and η. The theory contains only three parameters independent of the number of heavy-quark species involved. They can be determined by the decays D*→D+π, Σc→Λc+π, and Σc*→Σc+π. Theoretically, these coupling constants are related, through partial conservation of axial-vector current, to the axial charges of the heavy mesons and the heavy baryons. They are all calculable in the nonrelativistic quark model by using the spin wave functions of these particles alone. The theory is applied to strong decays and semileptonic weak decays of the heavy mesons and baryons. The implications are also discussed.
Phys. Rev. D. 07/1992; 46(3).
• Source
Article: Charmless decays B -> PP, PV, and effects of new strong and electroweak penguins in Topcolor-assisted Technicolor model
[hide abstract]
ABSTRACT: Based on the low energy effective Hamiltonian with generalized factorization, we calculate the new physics contributions to the branching ratios and CP-violating asymmetries of the two-body charmless hadronic decays $B \to PP, PV$ from the new strong and electroweak penguin diagrams in the TC2 model. The top-pion penguins dominate the new physics corrections, and both new gluonic and electroweak penguins contribute effectively to most decay modes. For tree-dominated decay modes $B \to \pi \pi, \rho \pi, etc,$ the new physics corrections are less than 10%. For decays $B \to K^{(*)} \pi$, $K^{(*)} \eta$, $etc$, the new physics enhancements can be rather large (from $- 70%$ to $\sim 200%$) and are insensitive to the variations of $N_c^{eff}$, $k^2$, $\eta$ and $m_{\tilde{\pi}}$ within the reasonable ranges. For decays $B^0 \to \phi \pi$, $\phi \eta^{(')}$, $K^* \bar{K}^0$ and $\rho^+ K^0$, $\delta {\cal B}$ is strongly $N_c^{eff}-$dependent: varying from -90% to $\sim 1680%$ in the range of $N_c^{eff}=2-\infty$. The new physics corrections to the CP-violating asymmetries ${\cal A}_{CP}$ vary greatly for different B decay channels. For five measured CP asymmetries of $B \to K \pi, K \eta', \omega \pi$ decays, $\delta {\cal A}_{CP}$ is only about 20% and will be masked by large theoretical uncertainties. The new physics enhancements to interesting $B \to K \eta'$ decays are significant in size ($\sim 50%$), insensitive to the variations of input parameters and hence lead to a plausible interpretation for the unexpectedly large $B \to K \eta'$ decay rates. The TC2 model predictions for branching ratios and CP-violating asymmteries of all fifty seven $B \to PP, PV$ decay modes are consistent with the available data within one or two standard deviations.
European Physical Journal C 12/2000; · 5.25 Impact Factor