Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-14
Phys.Lett.B695:463-468,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version to appear in Phys. Lett. B. The discussion of the zero-bin subtraction is modified. Some typos corrected
Scientific paper
10.1016/j.physletb.2010.11.060
Gauge invariance in soft-collinear effective theory (SCET) is discussed in regular (covariant) and singular (light-cone) gauges. It is argued that SCET, as it stands, is not capable to define in a gauge invariant way certain non-perturbative matrix elements that are an integral part of many factorization theorems. Those matrix elements involve two quark or gluon fields separated not only in light-cone direction but also in the transverse one. This observation limits the range of applicability of SCET. To remedy this we argue that one needs to introduce a new Wilson line as part of SCET formalism, that we call T. This Wilson line depends only on the transverse component of the gluon field. As such it is a new feature to the SCET formalism and it guarantees gauge invariance of the non-perturbative matrix elements in both classes of gauges.
Idilbi Ahmad
Scimemi Ignazio
No associations
LandOfFree
Singular and Regular Gauges in Soft Collinear Effective Theory: The Introduction of the New Wilson Line T does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Singular and Regular Gauges in Soft Collinear Effective Theory: The Introduction of the New Wilson Line T, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Singular and Regular Gauges in Soft Collinear Effective Theory: The Introduction of the New Wilson Line T will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-76415