Potential nonrelativistic QCD and heavy quarkonium spectrum in next-to-next-to-next-to-leading order
نویسندگان
چکیده
منابع مشابه
Heavy-quarkonium Production at Next-to-leading Order
The factorization formalism of nonrelativistic quantum chromodynamics (NRQCD) provides a rigorous theoretical framework for the description of heavy-quarkonium production and decay that is renormalizable and predictive.1 Theoretical predictions are decomposed into sums over products of short-distance coefficients, which can be calculated perturbatively as expansions in the strong-coupling const...
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The theoretical study of the nonrelativistic heavy quark-antiquark system [1] and its application to bottomonium [2] and toponium [3] physics is of special interest because it relies entirely on the first principles of QCD. The system in principle allows for a perturbative treatment with the nonperturbative effects being well under control and with no crucial model dependence. This makes the he...
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We investigate the unpolarized virtual photon structure functions F 2 x;Q2; P2 and F L x;Q2; P2 in perturbative QCD for the kinematical region 2 P2 Q2, where Q2 ( P2) is the mass squared of the probe (target) photon and is the QCD scale parameter. Using the framework of the operator product expansion supplemented by the renormalization group method, we derive the definite predictions for the mo...
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We investigate the unpolarized virtual photon structure functions F γ 2 (x,Q 2, P 2) and F γ L(x,Q 2, P 2) in perturbative QCD for the kinematical region Λ2 ≪ P 2 ≪ Q2, where −Q2(−P 2) is the mass squared of the probe (target) photon and Λ is the QCD scale parameter. Using the framework of the operator product expansion supplemented by the renormalization group method, we derive the definite pr...
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Corrections of order T 4 to vector and axial current correlators in QCD at a finite temperature T < Tc are obtained using dispersion relations for the amplitudes of deep inelastic scattering on pions. Their relation with the operator product expansion is presented. An interpretation of the results in terms of T -dependent meson masses is given: masses of ρ and a1 start to move with temperature ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2003
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)80202-5