Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-04-19
Phys.Lett. B539 (2002) 59-66
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages
Scientific paper
We discuss restrictions on operators in the soft-collinear effective theory (SCET) which follow from the ambiguity in the decomposition of collinear momenta and the freedom in the choice of light-like basis vectors $n$ and $\bar n$. Invariance of SCET under small changes in $n$ and/or $\bar n$ implies a symmetry of the effective theory that constrains the form of allowed operators with collinear fields. The restrictions occur at a given order in the power counting as well as between different orders. As an example, we present the complete set of higher order operators that are related to the collinear quark kinetic term.
Mehen Thomas
Pirjol Dan
Stewart Iain W.
~Manohar Aneesh V.
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