منابع مشابه
Excited 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 کاملQCD 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 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 کاملfBs from QCD sum rules
The decay constants of the pseudoscalar mesons B and Bs are evaluated from QCD sum rules for the pseudoscalar two-point function. Recently calculated perturbative three-loop QCD corrections are incorporated into the sum rule. An analysis in terms of the bottom quark pole mass turns out to be unreliable due to large higher order radiative corrections. On the contrary, in the MS scheme the higher...
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: Physics Letters B
سال: 1984
ISSN: 0370-2693
DOI: 10.1016/0370-2693(84)90614-2