Heavy
نویسندگان
چکیده
منابع مشابه
Production of heavy quarks and heavy quarkonia
Uncertainties in the next-to-leading-order calculations of heavyquark (Q) production are investigated. Predictions for total cross sections, single-inclusive distributions of heavy quarks and heavy flavoured hadrons, as well as for QQ̄ correlations, are compared with charm and bottom data. The description of heavy-quarkonium production requires a separation of the short-distance scale of QQ̄ prod...
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Using the Bethe-Salpeter (B-S) equations for heavy baryons ΛQ, ΣQ, ΞQ and ΩQ (Q = b or c), which were established in previous work, we calculate the heavy quark distribution functions in these baryons. The numerical results indicate that these distribution functions have an obvious peak at some fraction, α0, of the baryon’s light-cone “plus” momentum component carried by the heavy quark, and th...
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Calculations of the heavy-heavy spectrum present a good opportunity for precision tests of QCD using lattice techniques. All methods make use of a non-relativistic expansion of the action and its systematic improvement to remove lattice artefacts. There was convincing demonstration this year that these methods work and that the associated perturbation theory is well-behaved. Comparison to exper...
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We reanalyze B ! D and B ! KJ= data to extract a set of parameters which give the relevant hadronic matrix elements in terms of factorized amplitudes. Various sources of theoretical uncertainties are studied, in particular those depending on the model adopted for the form factors. We nd that the t to the B ! D branching ratios substantially depends on the model describing the Isgur-Wise functio...
متن کاملHeavy Quarkonium ∗
I review heavy quarkonium physics in view of recent experimental results. In particular, I discuss new results on spin singlet states, photon and hadronic transitions, D−states and discovery of yet unexplained narrow X(3872) state. 1 Quarkonia Quarkonium is a bound state of a quark and its anti-quark. Some properties of light and heavy quarkonia are compared to properties of positronium in Tabl...
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ژورنال
عنوان ژورنال: Journal of the American Academy of Physician Assistants
سال: 2021
ISSN: 1547-1896
DOI: 10.1097/01.jaa.0000753956.26380.e2