24,632 research outputs found
IR-Improved DGLAP-CS QCD Parton Showers in Pythia8
We introduce the recently developed IR-improved DGLAP-CS theory into the
showers in Pythia8, as this Monte Carlo event generator is in wide use at LHC.
We show that, just as it was true in the IR-improved shower Monte Carlo
Herwiri, which realizes the IR-improved DGLAP-CS theory in the Herwig6.5
environment, the soft limit in processes such as single heavy gauge boson
production is now more physical in the IR-improved DGLAP-CS theory version of
Pythia8. This opens the way to one's getting a comparison between the actual
detector simulations for some of the LHC experiments between IR-improved and
unimproved showers as Pythia8 is used in detector simulations at LHC whereas
Herwig6.5, the environment of the only other IR-improved DGLAP-CS QCD MC in the
literature, Herwiri1.031, is not any longer so used. Our achieving the
availability of the IR-improved DGLAP-CS Pythia8 then is an important step in
the further development of the LHC precision theory program under development
by the author and his collaborators.Comment: 6 pages, 1 figur
Massive Elementary Particles and Black Holes in Resummed Quantum Gravity
We use exact results in a new approach to quantum gravity to show that the
classical conclusion that a massive elementary point particle is a black hole
is obviated by quantum loop effects. Further phenomenological implications are
discussed.Comment: 4 pages, 1 figure; presented at ICHEP0
QCD for the LHC
We discuss the new era of precision QCD as it relates to the physics
requirements of the LHC for both the signal and background type processes. Some
attention is paid to the issue of the theoretical error associated with any
given theoretical prediction. In the cases considered, we present where the
theory precision is at this writing and where it needs to go in order that it
not impede the discovery potential of the LHC physics program. To complete the
discussion, we also discuss possible paradigms the latter program may help us
understand and some new developments that may play a role in achieving that
respective understanding.Comment: 15 pages, 5 figures. Invited talk presented at 2011 Epiphany
Conference, Krakow, Poland, Jan., 2011; improved references; added Baylor
preprint numbe
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