Conveners
Parallel Session B: TMD theory: small x
- Piet Mulders (Nikhef and VU University)
Parallel Session B: TMD theory: small x
- Laurent Favart (Université Libre de Bruxelles)
The two-scale evolution of Collins-Soper-Sterman-type for the unintegrated PDF in the regime qT << mu is derived from the BFKL evolution in physical rapidity with longitudinal momentum conservation constraint in coordinate space form. Comparisons of analytic results with Monte-Carlo implementation of the evolution are also done. This work is a continuation of the calculation done in Phys. Rev....
We study the small-$x$ asymptotics of the flavor non-singlet T-odd leading-twist quark transverse momentum dependent parton distributions (TMDs), the Sivers and Boer-Mulders functions. While the leading eikonal small-$x$ asymptotics of the quark Sivers function is given by the spin-dependent odderon, we are interested in revisiting the sub-eikonal correction considered by us earlier. We first...
Resolution of the proton spin puzzle, which is inability of the constituent quark model to explain discrepancy between the spin-$1/2$ of the proton and the amount of spin carried by its quarks and gluons, as measured in experiment, is an outstanding problem in modern hadronic physics. One possibility is that "missing” spin of the proton may be found at small values of Bjorken-x. As a result,...
Recently, a revised small-$x$ evolution equation for quarks and gluons inside the proton has been constructed to the double-logarithmic order, resumming powers of $\alpha_s\ln^2(1/x)$, with $\alpha_s$ the strong coupling constant. The equation takes into account the observation that the evolution of the sub-eikonal operator, $\overleftarrow{D}^i D^i$, mixes with other helicity-dependent...
