2,893 research outputs found

    Open charm meson spectroscopy: Where to place the latest piece of the puzzle

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    We discuss how to classify the csˉc{\bar s} meson DsJ(3040)D_{sJ}(3040) recently discovered by the BaBar Collaboration. We consider four possible assignments, together with signatures useful to distinguish among them.Comment: RevTeX, 5 pages, 1 eps figur

    QCD Interactions of Heavy Mesons with Pions by Light-Cone Sum Rules

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    Light-cone QCD sum rules are employed to compute the strong coupling constants: g_{B^* B^* pi}, g_{B_1 B_0 pi} and g_{B_1 B^* pi}, where (B,B^*) and (B_0,B_1) are negative and positive parity (0^-,1^-) and (0^+,1^+) \bar qQ doublets. The couplings are calculated both for finite values of the heavy quark mass and in the infinite heavy quark mass limit, deriving sum rules for m_Q \to \infty.Comment: Latex, 23 pages, 6 figures. Revised version to appear in Z. Phys.

    B -> X_u l nu decay distributions to order alpha_s

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    An analytic result for the O(alpha_s corrections to the triple differential B -> X_u l nu decay rate is presented, to leading order in the heavy-quark expansion. This is relevant for computing partially integrated decay distributions with arbitrary cuts on kinematic variables. Several double and single differential distributions are derived, most of which generalize known results. In particular, an analytic result for the O(alpha_s) corrections to the hadronic invariant mass spectrum is presented. The effects of Fermi motion, which are important for the description of decay spectra close to infrared sensitive regions, are included. The behaviour of perturbation theory in the region of time-like momenta is also investigatedComment: 24 pages, 11 figures, 1 typo in eq.(5.4) corrected; version published in JHEP06(1999)01

    On three-body B0DD()0K+B^0 \to D^{*-} D^{(*)0} K^+ decays and couplings of heavy mesons to light pseudoscalar mesons

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    We analyze the decay modes B0DD0K+B^0 \to D^{*-} D^0 K^+ and B0DD0K+B^0 \to D^{*-} D^{*0} K^+ and, using the available experimental data, we find bounds for the constants g and h describing the strong coupling of heavy mesons to light pseudoscalar mesons. Both the decay channels are dominated by broad L=1 charm resonances; the dominance is effective also in B0DD0K+B^0 \to D^{-} D^0 K^+ and B0DD0K+B^0 \to D^{-} D^{*0} K^+.Comment: LaTex, 16 pages, 5 figure

    Radiative ϕ\phi-meson decays and η\eta-η\eta^\prime mixing: a QCD sum rule analysis

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    The radiative transitions ϕηγ\phi \to \eta \gamma and ϕηγ\phi \to \eta^\prime \gamma are analysed using QCD sum-rules. The results we obtain for B(ϕηγ)=(1.15±0.2)102{\cal B}(\phi \to \eta \gamma)=(1.15 \pm 0.2) 10^{-2} and B(ϕηγ)=(1.18±0.4)104{\cal B}(\phi \to \eta^\prime \gamma)=(1.18 \pm 0.4) 10^{-4} are in very good agreement with existing experimental data. The related issue of ηη\eta-\eta^\prime mixing is discussed and we give predictions for the η\eta and η\eta^\prime decay constants in the framework of a mixing scheme in the quark-flavour basis.Comment: Latex, 15 pages, 3figures. Some typos correcte

    Light-cone sum rules: A SCET-based formulation

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    We describe the construction of light-cone sum rules (LCSRs) for exclusive BB-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory (SCET). As an example, we consider the SCET sum rule for the BπB \to \pi transition form factor at large recoil, including radiative corrections from hard-collinear loop diagrams at first order in the strong coupling constant.Comment: LaTex, 4 pages, 2 eps figures. Talk given at QCD05, 12th International QCD Conference, 4-9th July 2005, Montpellier, Franc