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      Light-Cone Sum Rules for the \(D_{(s)}\rightarrow \eta^{(\prime)} l \nu_l\) Form Factor

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          Abstract

          We present an improved light-cone sum rule analysis of the decay form factors of \(D\) and \(D_s\) into \(\eta\) and \(\eta^{\prime}\) and argue that these decays offer a very promissing possibility to determine the leading Fock-state gluonic contribution of the \(\eta'\) at future experimental facilities as FAIR or Super-KEKB. We also give the corresponding branching ratios for B decays.

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          QCD and resonance physics: The ϱ-ω mixing

          A.I. Vainshtein, V.I. Zakharov, M.A. SHIFMAN (1979)
          Article 0 comments Cited 109 times – based on 0 reviews     Review now
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            Mixing and Decay Constants of Pseudoscalar Mesons

            , , (2009)
            We propose a new eta-eta' mixing scheme where we start from the quark flavor basis and assume that the decay constants in that basis follow the pattern of particle state mixing. On exploiting the divergences of the axial vector currents - which embody the axial vector anomaly - all basic parameters are fixed to first order of flavor symmetry breaking. That approach naturally leads to a mass matrix, quadratic in the masses, with specified elements. We also test our mixing scheme against experiment and determine corrections to the first order values of the basic parameters from phenomenology. Finally, we generalize the mixing scheme to include the eta(c). Again the divergences of the axial vector currents fix the mass matrix and, hence, mixing angles and the charm content of the eta and eta'.
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              Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited

              V. Braun, S. Agaev, F. A. Porkert … (2010)
              We provide a theoretical update of the calculations of the pi0-gamma*-gamma form factor in the LCSR framework, including up to six polynomials in the conformal expansion of the pion distribution amplitude and taking into account twist-six corrections related to the photon emission at large distances. The results are compared with the calculations of the B-> pi l nu decay and pion electromagnetic form factors in the same framework. Our conclusion is that the recent BaBar measurements of the pi0-gamma*-gamma form factor at large momentum transfers are consistent with QCD, although they do suggest that the pion DA may have more structure than usually assumed.
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                Author and article information

                Journal
                Publication date Created: 10 July 2013
                Publication date Updated: 2013-07-14
                Article
                DOI: 10.1103/PhysRevD.88.034023
                ArXiV ID: 1307.2797
                SO-VID: 985f4ee4-6bdf-4a95-90cb-34eb0f895928
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Comments 10 pages, 5 figures, Minor wording changes and some references added, results unchanged
                Categories hep-ph

                ScienceOpen disciplines: High energy & Particle physics
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                ScienceOpen disciplines: High energy & Particle physics

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