Finite-width QCD sum rules for $rho; and $omega; mesons
نویسندگان
چکیده
منابع مشابه
QCD Finite Energy Sum Rules and the Isoscalar Scalar Mesons
We apply QCD Finite Energy Sum Rules to the scalar-isoscalar current to determine the lightest uu+ dd meson in this channel. We use ‘pinch-weights’ to improve the reliability of the QCD predictions and reduce the sensitivity to the cut-off s0. A decaying exponential is included in the weight function to allow us to focus on the contribution from low mass states to the phenomenological integral....
متن کاملExcited Heavy Mesons from Qcd Sum Rules
In this talk, we focus on the L = 1 excited charm mesons. It is heuristic to illustrate them in the following way, although it is not accurate (L is not a conserved quantity). For the ground state (L = 0) mesons which we are familiar with, there are two states with the J quantum numbers: D(0) and D(1). Their difference only lies in the heavy quark spin direction. For the L = 1 case, there are f...
متن کاملOn Qcd Sum Rules for Vector Mesons in Nuclear Medium *
Vector mesons show up in the electromagnetic current-current correlator. QCD sum rules provide a constraint on hadronic models for this correlator. This constraint is discussed for the case of finite nuclear density concerning the longitudinal as well as the transverse part of the current-current correlator at finite three-momentum. PACS numbers: 24.85.+p, 21.65.+f, 12.38.Lg, 14.40.Cs
متن کاملValid QCD sum rules for vector mesons in nuclear matter.
QCD sum rules for vector mesons (ρ, ω, φ) in nuclear matter are reexamined with an emphasis on the reliability of various sum rules. Monitoring the continuum contribution and the convergence of the operator product expansion plays crucial role in determining the validity of a sum rule. The uncertainties arising from less than precise knowledge of the condensate values and other input parameters...
متن کاملFinite energy chiral sum rules in QCD
The saturation of QCD chiral sum rules of the Weinberg-type is analyzed using ALEPH and OPAL experimental data on the difference between vector and axial-vector correlators (V-A). The sum rules exhibit poor saturation up to current energies below the tau-lepton mass. A remarkable improvement is achieved by introducing integral kernels that vanish at the upper limit of integration. The method is...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Progress in Particle and Nuclear Physics
سال: 2004
ISSN: 0146-6410
DOI: 10.1016/s0146-6410(04)00046-8