Potential NRQCD and heavy-quarkonium spectrum at next-to-next-to-next-to-leading order
نویسندگان
چکیده
منابع مشابه
Heavy Quarkonium Physics beyond the Next-to-Next-to-Leading Order of NRQCD
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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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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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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+ e − → t ¯ t and γγ → t ¯ t observables near the threshold up to the next-to-next-to-leading order of NRQCD. Abstract We present an analytical description of top-antitop pair production near the threshold in e + e − annihilation and γγ collisions. A set of basic observables considered includes the total cross sections, forward-backward asymmetry and top quark polarization. The threshold effect...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2002
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(02)00403-0