Unravelling Soft Components in the Shape Function for Inclusive B Decays
| Autor: | Hiroyuki Kawamura, Jiro Kodaira, Kazuhiro Tanaka |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Quantum chromodynamics
Physics Particle physics Physics and Astronomy (miscellaneous) Basis (linear algebra) High Energy Physics::Lattice Nuclear Theory High Energy Physics::Phenomenology Spectrum (functional analysis) FOS: Physical sciences Equations of motion Function (mathematics) High Energy Physics - Phenomenology Theoretical physics High Energy Physics - Phenomenology (hep-ph) Operator (computer programming) Quark–gluon plasma High Energy Physics::Experiment Limit (mathematics) Nuclear Experiment |
| Zdroj: | Progress of Theoretical Physics. 113:183-198 |
| ISSN: | 1347-4081 0033-068X |
| DOI: | 10.1143/ptp.113.183 |
| Popis: | In the heavy-quark limit, the decay spectrum for radiative and semileptonic inclusive B-meson decays is determined by a universal structure function, i.e. the shape function. We study the constraints on the bilocal heavy-quark operator for the shape function from the QCD equations of motion and heavy-quark symmetry, and we obtain a new basis of nonlocal operators that reveals relevant soft components in the shape function. Those nonlocal operators represent the ``kinetic energy distribution'' of the b-quark inside the B-meson and the four-parton correlations with additional quarks and gluons. A corresponding local operator basis relevant for relating the shape function to HQET parameters is also given, and novel effects of the quark-gluon correlations are discussed. 19 pages PTPTeX. Typos corrected and improvements made to the text. References added. Published version |
| Databáze: | OpenAIRE |
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