Soft-Collinear Messengers: A New Mode in Soft-Collinear Effective Theory

Details Soft-Collinear Messengers: A New Mode in Soft-Collinear Effective Theory Soft-Collinear Messengers: A New Mode in Soft-Collinear Effective Theory

2003-08-11

arxiv.org/abs/hep-ph/0308122v2

Phys.Rev. D69 (2004) 054017

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 5 figures. Extended Section 6, clarifying the relevance of different types of soft-collinear interactions

Scientific paper

10.1103/PhysRevD.69.054017

It is argued that soft-collinear effective theory for processes involving both soft and collinear partons, such as exclusive B-meson decays, should include a new mode in addition to soft and collinear fields. These "soft-collinear messengers" can interact with both soft and collinear particles without taking them far off-shell. They thus can communicate between the soft and collinear sectors of the theory. The relevance of the new mode is demonstrated with an explicit example, and the formalism incorporating the corresponding quark and gluon fields into the effective Lagrangian is developed.

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