Unravelling Soft Components in the Shape Function for Inclusive B Decays(Particles and Fields)

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概要

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• 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.

• 理論物理学刊行会の論文
• 2005-01-25

著者

• KODAIRA Jiro

  Theory Division, KEK

• KAWAMURA Hiroyuki

  Theory Group, KEK

• KODAIRA Jiro

  Dept. of Physics, Hiroshima University

• Kawamura Hiroyuki

  Theory Group Desy

• Tanaka Kazuhiro

  Dept. Mechanical Information Science And Technology Kyushu Institute Of Technology

• KAWAMURA Hiroyuki

  Department of Fundamental Sciences FIHS, Kyoto University

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