Perturbative heavy quarkonium spectrum at 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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Neutron matter presents a unique system for chiral effective field theory because all many-body forces among neutrons are predicted to next-to-next-to-next-to-leading order (N(3)LO). We present the first complete N(3)LO calculation of the neutron matter energy. This includes the subleading three-nucleon forces for the first time and all leading four-nucleon forces. We find relatively large cont...
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This is a summary of the contributions on the next-to-leading order corrections to the BFKL equation which were presented to the ‘Small-x and Diffraction’ working group at the 1998 Durham Workshop on HERA Physics. The original BFKL equation [1] allowed the computation of elastic scattering amplitudes in the Regge limit to leading logarithmic (LO) accuracy, i.e. all terms ∼ (αs ln s)n are summed...
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We compute the two-loop term in the perturbation series for the quark-mass in the lattice Heavy Quark Effective Theory (HQET). This is an ingredient in the matching factor required to obtain the b-quark mass from lattice simulations of the HQET. Combining our calculation with numerical results from the APE collaboration, we find, at two-loop order, mb ≡ m MS b (m MS b ) = 4.41 ± 0.05 ± 0.10GeV....
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2014
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2014.01.030