Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-17
Nucl.Phys.B643:431-476,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
46 pages, LaTeX; v2: two references added, eq. (52) corrected
Scientific paper
10.1016/S0550-3213(02)00687-9
An important unresolved question in strong interaction physics concerns the parameterization of power-suppressed long-distance effects to hard processes that do not admit an operator product expansion (OPE). Recently Bauer et al.\ have developed an effective field theory framework that allows one to formulate the problem of soft-collinear factorization in terms of fields and operators. We extend the formulation of soft-collinear effective theory, previously worked out to leading order, to second order in a power series in the inverse of the hard scale. We give the effective Lagrangian and the expansion of ``currents'' that produce collinear particles in heavy quark decay. This is the first step towards a theory of power corrections to hard processes where the OPE cannot be used. We apply this framework to heavy-to-light meson transition form factors at large recoil energy.
Beneke Martin
Chapovsky A. P.
Diehl Markus
Feldmann Th.
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