14 research outputs found
Possible Single Resonant Production of the Fourth Generation Charged Leptons at Colliders
Single resonant productions of the fourth standard model generation charged
lepton via anomalous interactions at gamma e colliders based on future linear
e^+ e^- colliders with 500 GeV and 1 TeV center of mass energies are studied.
Signatures of and
anomalous processes followed by the hadronic and leptonic decay of the Z boson
and corresponding standard model backgrounds are discussed in details. The
lowest necessary luminosities to observe these processes and the achievable
values of the anomalous coupling strengths are determined.Comment: 9 pages, 6 figures, 4 table
Leptoquark Single and Pair production at LHC with CalcHEP/CompHEP in the complete model
We study combined leptoquark (LQ) single and pair production at LHC at the
level of detector simulation. A set of kinematical cuts has been worked out to
maximize significance for combined signal events.
It was shown that combination of signatures from LQ single and pair
production not only significantly increases the LHC reach, but also allows us
to give the correct signal interpretation. In particular, it was found that the
LHC has potential to discover LQ with a mass up to 1.2 TeV and 1.5 TeV for the
case of scalar and vector LQ, respectively, and LQ single production
contributes 30-50% to the total signal rate for LQ-l-q coupling, taken equal to
the electromagnetic coupling.
This work is based on implementation of the most general form of scalar and
vector LQ interactions with quarks and gluons into CalcHEP/CompHEP packages.
This implementation, which authors made publicly available, was one the most
important aspects of the study.Comment: LaTeX, 27 pages, 15 figure
Separation of a single photon and products of the meson neutral decay channels in the CMS electromagnetic calorimeter using neural network
The artificial neural network approach is used for separation of signals from
a single photon and products of the meson neutral
decay channels on the basis of the data from the CMS electromagnetic
calorimeter alone. Rejection values for the three types of mesons as a function
of single photon selection efficiencies are obtained for two Barrel and one
Endcap pseudorapidity regions and initial \Et of 20, 40, 60 and 100 GeV.Comment: 16 pages, uses cernrep.cls style fil
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Measurement of the View the tt production cross-section using eÎŒ events with b-tagged jets in pp collisions at âs = 13 TeV with the ATLAS detector
This paper describes a measurement of the inclusive top quark pair production cross-section (ÏttÂŻ) with a data sample of 3.2 fbâ1 of protonâproton collisions at a centre-of-mass energy of âs = 13 TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electronâmuon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously ÏttÂŻ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be:
ÏttÂŻ = 818 ± 8 (stat) ± 27 (syst) ± 19 (lumi) ± 12 (beam) pb,
where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented
Radiation Tolerant Optical Links for the
ATLAS is one of the large particle detectors at LHC which will become operational in 2006. The data from the ATLAS Semiconductor Tracker and Pixel Detector to the acquisition electronics will be transfered via radiation tolerant optical links. The overall architecture and the performance of these optical data links is described. A major focus is the radiation tolerance of the single components and the behaviour of the optical links in an ATLAS-like environment
Towards a Detector Control System for the
The innermost part of the ATLAS experiment at the LHC, CERN, will be a pixel detector consisting of about 1750 individual detector modules. The high power density of the electronics, the harsh radiation environment, and the inaccessibility over long terms are the speci c constraints for the design of the pixel detector control system (DCS). Selection and development of adequate hardware components as well as ecient software strategies are required to guarantee the safety of the detector and to support a reliable operation during data taking. The various building blocks of the pixel DCS will be described. Following the recommendations for the LHC experiments we have started to build software units using the Supervisory Control And Data Acquisition (SCADA) PVSS, a commercial software product (Prozessvisualisierungsu. Steuerungssytem: ETM Co., Austria). We report about the status of our software development and how the complexity of the various detector components can be mapped onto the SCADA system