Hard scale uncertainty in collinear factorization: Perspective from kt -factorization

BFKL predictions at small x from kT and collinear factorization viewpoints

Hard scattering processes involving hadrons at small x are described by a kT -factorization formula driven by a BFKL gluon. We explore the equivalence of this description to a collinear-factorization approach in which the anomalous dimensions γgg and γqg/αS are expressed as power series in αS log(1/x), or to be precise αS/ω where ω is the moment index. In particular we confront the collinear-fa...

Charm Content of a Proton in Collinear Parton Model and in Kt−factorization Approach

It is shown that the difference between the c-quark proton SF’s calculated in the kT -factorization approach using different unintegrated gluon distribution functions is the same order as the difference between results obtained in the parton model and in the kT -factorization approach.

Heavy quark impact factor in kT -factorization

Factorization in hard diffraction

In this talk, I reviewed the role of factorization in diffraction hard scattering.

Soft-Collinear Factorization in Effective Field Theory

The factorization of soft and ultrasoft gluons from collinear particles is shown at the level of operators in an effective field theory. Exclusive hadronic factorization and inclusive partonic factorization follow as special cases. The leading order Lagrangian is derived using power counting and gauge invariance in the effective theory. Several species of gluons are required, and softer gluons ...