Virtualisation of Grid Resources and Prospects of the Measurement of Z Boson Production in Association with Jets at the Large Hadron Collider

At the Large Hadron Collider (LHC), a large number of
events containing Z bosons will be available and the
calibration of the absolute jet energy scale with
these events becomes feasible for the first time.
Such a calibration is important as the uncertainty on
this observable will be the dominant systematical
uncertainty on most LHC analyses. This work
demonstrates the feasibility of such a calibration
within the CMS experiment through a comparison of the
momentum of a jet with the precisely reconstructed
momentum of a Z boson decaying into two muons. The
four LHC experiments will produce about 15 petabytes
of data annually which are stored and processed using
grid technologies. This, however, requires additional
services which do not fully load server machines at
smaller grid sites. The virtualisation of operating
systems enables the consolidation of different
services on a few server machines. Extending this
concept to batch queuing systems allows overcoming
intrinsic limitations of shared computing
infrastructures. Both, the consolidation of an
institute''s computing and grid infrastructure and a
prototype implementation of a virtualised batch
queuing systems are presented.

Autorentext
Dr. Volker Büge, Dipl.-Phys.: Studies of physics at the Universities of Karlsruhe and Grenoble; diploma and PhD thesis within the CMS collaboration at CERN; research in particle physics, data analysis, grid computing and virtualisation; lectures and exercises on grid middleware and virtualisation; program committee member of the XHPC workshops.

Klappentext
At the Large Hadron Collider (LHC), a large number of events containing Z bosons will be available and the calibration of the absolute jet energy scale with these events becomes feasible for the first time. Such a calibration is important as the uncertainty on this observable will be the dominant systematical uncertainty on most LHC analyses. This work demonstrates the feasibility of such a calibration within the CMS experiment through a comparison of the momentum of a jet with the precisely reconstructed momentum of a Z boson decaying into two muons. The four LHC experiments will produce about 15 petabytes of data annually which are stored and processed using grid technologies. This, however, requires additional services which do not fully load server machines at smaller grid sites. The virtualisation of operating systems enables the consolidation of different services on a few server machines. Extending this concept to batch queuing systems allows overcoming intrinsic limitations of shared computing infrastructures. Both, the consolidation of an institute's computing and grid infrastructure and a prototype implementation of a virtualised batch queuing systems are presented.