22,662 research outputs found
Transverse momentum distributions in Semi-inclusive Deep Inelastic Scattering
Within a perturbative approach to Quantum Chromodynamics (QCD), we show how
to extend ordinary DGLAP longitudinal evolution equations to include the
radiative transverse momentum generated in the collinear branching regime.
Considering Semi-inclusive Deep Inelastic Scattering as a reference process, we
perform such a generalization both in the current and in the target
fragmentation region. These distributions are then used to predict
semi-inclusive Deep Inelastic Scattering cross-sections onto the whole phase
space of the detected hadron.Comment: 6 pages. Invited talk at "Symmetries and Spin", Prague, July 19-2
Construction of nice nilpotent Lie groups
We illustrate an algorithm to classify nice nilpotent Lie algebras of
dimension up to a suitable notion of equivalence; applying the algorithm,
we obtain complete listings for . On every nilpotent Lie algebra of
dimension , we determine the number of inequivalent nice bases, which
can be , , or .
We show that any nilpotent Lie algebra of dimension has at most countably
many inequivalent nice bases.Comment: v3: Condition (N3) has been changed to exclude diagrams with arrows
with the same label as the starting node, this will not affect the rest of
the paper or the results, since this condition was implicitly assumed through
the paper. Added a final remark 3.9. Presentation improved and bibliography
updated. Article 28 Pages; Tables in ancillary file 137 page
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