22,570 research outputs found
Fall and rise of the gluon splitting function
This talk reviews some recent results on the NLL resummed small-x gluon
splitting function, as determined including renormalisation-group improvements.
It also discusses the observation that the LO, NLO, NNLO, etc. hierarchy for
the gluon splitting function breaks down not when (alpha_s log 1/x) is of order
one but rather for (alpha_s log^2 1/x) of order one.Comment: 7 pages, 3 figures; Talk presented at DIS 2004, Strbske Pleso,
Slovakia, April 2004, and at the Eighth Workshop on Non-Perturbative Quantum
Chromodynamics, Paris, France, June 200
The status of NLL BFKL
This talk summarises the current status of the NLL corrections to BFKL
physics and discusses the question of small-x factorisation.Comment: 4 pages, 2 figures. Uses moriond.sty (included). Talk presented at
the XXXVth Rencontres de Moriond, QCD and High Energy Hadronic Interactions,
Les Arcs, France, March 18-25, 200
Recent developments in perturbative QCD
A brief overview of some recently active topics in perturbative QCD,
including: string-inspired recursion techniques at tree level; recursion
approaches and automation of standard techniques for 1-loop calculations; the
status of NNLO jet calculations; and non-trivial structures that appear in
higher-order calculations.Comment: 9 pages, 1 figure. Invited talk at the XIV International Workshop on
Deep Inelastic Scattering (DIS 2006), April 2006, Tsukuba, Japa
Moriond 2009, QCD and High Energy Interactions: Theory Summary
These proceedings provide a brief summary of the theoretical topics that were
covered at Moriond QCD 2009, including non-perturbative QCD, perturbative QCD
at colliders, a small component of physics beyond the standard model and
heavy-ion collisions.Comment: 13 pages, 7 figures; v2 adds a reference; v3 includes small changes
to tex
A resummation of large sub-leading corrections at small x
The NLL corrections to the BFKL kernel are known to be very large, to the
extent that even for small values of alpha_s, they lead to physical cross
sections which are not positive definite. It is shown in the context of a toy
model, that such pathological behaviour is an artifact of the truncation at NLL
order, and is associated in particular with double transverse logarithms. These
are resummed in a manner consistent with the full NLL kernel, and are shown to
change its properties quite considerably.Comment: 19 pages LaTeX, 5 figures, includes JHEP.cls and cite.sty. Version 2
additionally includes an appendix, numerous clarifications, correction of
typos and extra reference
QCD in hadron collisions
This talk examines recent progress in collider QCD and some facets of the
interplay between these developments and searches for new particles and
phenomena at the Tevatron and LHC.Comment: 9 pages, 4 figures, contribution to the proceedings of La Thuile
2012, the XXVI Rencontres de Physique de la Vall\'ee d'Aost
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