منابع مشابه
Top quark decays into heavy quark mesons.
For top quark decays into heavy quark mesons Υ and B̄ c , a complete calculation to the leading order both in QCD coupling constant αs and in v, the typical velocity of the heavy quarks inside the mesons, is performed. Relatons between the top quark mass and the decay branching ratios are studied. Comparion with the results which are obtained by using the quark frangmentation functions is also d...
متن کاملmesons ”
In [1] the light scalar meson nonet has been considered within the QCD sum rules approach with the interpolating current consisting of the scalar diquark and the scalar antidiquark. It has been shown that the negative contributions from the operators of dimension 8 are dominant in the sum rules, so that, there is no evidence of the coupling of the above tetraquark current with the light scalar ...
متن کاملB mesons ∗
B̄ → Dπ, D∗π, J/ψK̄ and J/ψπ decays are studied. Their amplitude is given by a sum of factorized and non-factorizable ones. The latter which is estimated by using a hard pion approximation is rather small in color favored B̄ → Dπ and D∗π decays but still can efficiently interfere with the main amplitude given by the factorization. In the color suppressed B̄ → J/ψK̄ and J/ψπ decays, the non-factoriza...
متن کاملHybrid mesons
A review of the theoretical and experimental status of hybrid hadrons is presented. The states π1(1400), π1(1600), and π1(2015) are thoroughly reviewed, along with experimental results from GAMS, VES, Obelix, COMPASS, KEK, CLEO, Crystal Barrel, CLAS, and BNL. Theoretical lattice results on the gluelump spectrum, adiabatic potentials, heavy and light hybrids, and transition matrix elements are d...
متن کاملSuppressed decays of D(s)(+) mesons to two pseudoscalar mesons.
Using data collected near the D{s}{*+}D{s}{-} peak production energy E_{cm}=4170 MeV by the CLEO-c detector, we study the decays of D{s}{+} mesons to two pseudoscalar mesons. We report on searches for the singly Cabibbo-suppressed D{s}{+} decay modes K{+}eta, K{+}eta', pi{+}K{S}{0}, K{+}pi{0}, and the isospin-forbidden decay mode D{s}{+}-->pi{+}pi{0}. We normalize with respect to the Cabibbo-fa...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 1998
ISSN: 1434-6044,1434-6052
DOI: 10.1007/s100520050144