منابع مشابه
Transition Form Factor γγ ∗ → π 0 and QCD sum rules
The transition γ * (q 1)γ * (q 2) → π • (p) is studied within the QCD sum rule framework. As a first step, we analyze the kinematic situation when both photon virtualities are spacelike and large. We construct a QCD sum rule for F γ * γ * π • (q 2 1 , q 2 2) and show that, in the asymptotic limit |q 2 1 |, |q 2 2 | → ∞, it reproduces the leading-order pQCD result. Then we study the limit |q 2 1...
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The H * Hπ form factor for H = B and D mesons is evaluated in a QCD sum rule calculation. We study the Borel sum rule for the three point function of two pseudoscalar and one vector meson currents up to order four in the operator product expansion. The double Borel transform is performed with respect to the heavy meson momenta. We discuss the momentum dependence of the form factors and two diff...
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We propose using the finite-temperature p-meson mass as an order parameter to monitor the QCD transition. This is suggested by the p-meson mass formula that emerges from finite-temperature QCD sum rules in the vector channel, and which encompasses the effects of both quark and gluon condensates. We find that a second-order chiral-restoring transition implies a second-order behavior for the p ma...
متن کاملSubleading Isgur-Wise form factors from QCD sum rules.
In the hea.vy-qua.& effective theory, current matrix elements between two heavy pseudosca1a.r or vector mesons a.re pa.ra.metrized by a. set of universa.1 form factors. These functions are calcula.ted to. suhlea.ding order in the l/nz~ expansion using QCD sum rules. The equa.tions of motion and Wa.rd ident,ities of the effective theory are incorpora,ted in the analysis. Within this approa.ch, p...
متن کاملHeavy-meson form factors from QCD sum rules.
A consistent framework is developed for studying hadronic form factors of heavy mesons using QCD sum rules in the heavy quark effective theory, including the-next-to-leading order renormalization group improvement. Sum rules are derived for the asymptotic value of the meson decay constant jp and for the universal Isgur-Wise form factor. It is shown that renormalization group effects considerabl...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1996
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(96)00492-0