2,269 research outputs found
Determination of Delta G/G from Open Charm events at COMPASS
One of the main goals of the COMPASS experiment at CERN is the determination
of the gluon polarisation in the nucleon, Delta G/G. It is determined from spin
asymmetries in the scattering of 160 GeV/c polarised muons on a polarised LiD
target. The gluon polarisation is accessed by the selection of photon-gluon
fusion (PGF) events. A very clean selection of PGF events can be obtained with
charmed mesons in the final state. Their detection is based on the
reconstruction of D* and D0 mesons in the COMPASS spectrometer. The analysis
method for the first measurement of Delta G/G from the open charm channel is
described and the result from COMPASS for the 2002-2004 data taking period is
presented.Comment: Talk given at the XV International Workshop on Deep-Inelastic
Scattering and Related Subjects, April 16-20, 2007, Munich, Germany
http://www.mppmu.mpg.de/dis200
Looking for Instanton-induced Processes at HERA Using a Multivariate Technique Based on Range Searching
We present a method to discriminate instanton-induced processes from standard
DIS background based on Range Searching. This method offers fast and automatic
scanning of a large number of variables for a combination of variables giving
high signal to background ratio and the smallest theoretical and experimental
uncertainties.Comment: Talk given at ACAT2000 Conference at Fermila
Modular symmetry and temperature flow of conductivities in quantum Hall systems with varying Zeeman energy
The behaviour of the critical point between quantum Hall plateaux, as the
Zeeman energy is varied, is analysed using modular symmetry of the Hall
conductivities following from the law of corresponding states. Flow diagrams
for the conductivities as a function of temperature, with the magnetic field
fixed, are constructed for different Zeeman energies, for samples with
particle-hole symmetry.Comment: 15 pages, 13 figure
Measurement of the LCG2 and glite file catalogue's performance
When the Large Hadron Collider (LHC) begins operation at CERN in 2007 it will produce data in volumes never before seen. Physicists around the world will manage, distribute and analyse petabytes of this data using the middleware provided by the LHC Computing Grid. One of the critical factors in the smooth running of this system is the performance of the file catalogues which allow users to access their files with a logical filename without knowing their physical location. This paper presents a detailed study comparing the performance and respective merits and shortcomings of two of the main catalogues: the LCG File Catalogue and the gLite FiReMan catalogue
On equation over \bq_p
In this paper we provide a solvability criterion for the monomial equation
over for any natural number .Comment: 5 page
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