Decay constants of charmed vector mesons D* and Ds* from QCD sum rulesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 2 сентября 2014 г.
Аннотация:We present a sum-rule calculation of the decay constants of the charmed vector mesons D∗and D∗sfrom the two-point correlator of vector currents. First, we show that the perturbative expansion in terms of the pole mass exhibits no sign of convergence whereas the reorganization of this expansion in terms of the MSmass leads to a distinct hierarchy. Second, making use of the operator product expansion in terms of the MSmass, we determine the decay constants of the D∗and D∗smesons with an emphasis on the uncertainties in these theoretically predicted quantities related both to the input QCD parameters and to the limited accuracy of the method of sum rules. Our results are fD∗=(252.2 ±22.3OPE±4syst)MeVand fD∗s=(305.5 ±26.8OPE±5syst)MeV. For the ratios of the vector-to-pseudoscalar decay constants we report fD∗/fD=1.221 ±0.080OPE±0.008systand fD∗s/fDs=1.241 ±0.057OPE±0.007syst.