Speaker
Description
Single-inclusive particle production in Deep Inelastic Scattering (DIS) provides a powerful probe of the three-dimensional partonic structure of hadrons and nuclei. While most small-x studies focus on the current fragmentation region of DIS, we investigate particle production in the target fragmentation region, which is naturally described in terms of fracture functions.
Focusing on longitudinally polarized virtual photons in the kinematic regime where the virtuality is much larger than the transverse momentum of the produced hadron/jet Q2≫PT2, we show that single-inclusive jet and hadron production in the target hemisphere yields a leading-power contribution that is not suppressed by PT /Q. We demonstrate that, at small Bjorken-x, the differential cross section factorizes in terms of extended quark and gluon fracture functions, for which we derive explicit analytic expressions within the Color Glass Condensate effective theory. Remarkably, the resulting factorized results satisfies a transverse-momentum-dependent analogue of the Altarelli–Martinelli relation.
We present numerical results for the extended quark and gluon fracture functions. Furthermore, we comment on the interplay between our results and the diffractive fracture functions, as well as the connection to nucleon-energy correlators.
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