Soft-collinear messengers: A new mode in soft-collinear effective theory | Zendy

Thomas Becher | Zendy; Richard J. Hill | Zendy; Matthias Neubert | Zendy

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Soft-collinear messengers: A new mode in soft-collinear effective theory

Author(s) -

Thomas Becher,

Richard J. Hill,

Matthias Neubert

Publication year - 2004

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Language(s) - English

Resource type - Journals

eISSN - 1550-7998

pISSN - 1550-2368

DOI - 10.1103/physrevd.69.054017

Subject(s) - physics , parton , formalism (music) , soft modes , particle physics , gluon , quark , quantum electrodynamics , quantum mechanics , art , musical , dielectric , visual arts , ferroelectricity

It is argued that soft-collinear effective theory for processes involvingboth soft and collinear partons, such as exclusive B-meson decays, shouldinclude a new mode in addition to soft and collinear fields. These"soft-collinear messengers" can interact with both soft and collinear particleswithout taking them far off-shell. They thus can communicate between the softand collinear sectors of the theory. The relevance of the new mode isdemonstrated with an explicit example, and the formalism incorporating thecorresponding quark and gluon fields into the effective Lagrangian isdeveloped.Comment: 22 pages, 5 figures. Extended Section 6, clarifying the relevance of different types of soft-collinear interaction

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