882 research outputs found
The CDF Run IIa silicon detector and its upgrade run IIb
No full textThe CDF RunIIa silicon detector has now made the transition from commissioning to data taking. The current state of the CDF RunIIa silicon detector's online and of fline tracking algorithms, the performance of Layer 00, and the status of the Run IIb silicon upgrade project are presented in this article. (c) 2005 Elsevier B.V. All rights reserved
Readout systems for inner detectors at the LHC and SLHC
No full textA general overview of the optoelectronic readout and control systems of the ATLAS and CMS inner detectors is given. The talk will also cover challenges and issues of future optoelectronic readout systems at the upgraded LHC (SLHC). First results of radiation tests of VCSELs and optical fibres which were irradiated up to SLHC fluences will be presented. (c) 2006 Elsevier B.V. All rights reserved
W charge asymmetry measurement in CDF Run2
Get PDFWe present the status of the forward-backward charge asymmetry measurement for W boson production using early Run 2 data collected with the Collider Detector at Fermilab (CDF). Tracking for forward electrons is a critical component of this measurement, and we describe a new technique which combines the position and energy measurements from the calorimeter with position measurements in the silicon detector to provide tracking and charge determination for electron candidates. The performance of this algorithm is described and the sensitivity for the W charge asymmetry measurement with Run 2 data is quantified
An improved weighting algorithm to achieve software compensation in a fine grained LAr calorimeter
No full textAn improved weighting algorithm applied to hadron showers has been developed for a fine grained LAr calorimeter. In contrast to standard weighting procedures, the new algorithm allows to reconstruct the total energy as well as the spatial energy deposition on the level of individual calorimeter cells. The linearity and the energy resolution of the pion signal in the momentum interval 2GeV/c≤p≤20GeV/c studied in this analysis are considerably improved in comparison to the standard weighting algorithm as practiced presently by the H1 collaboration. Moreover the energy spectra reconstructed with the new method follow in a broad interval a Gaussian distribution and have less pronounced tails. © 2005 Elsevier B.V. All rights reserved
Constraints on PDF uncertainties from CDF
No full textRecent electroweak measurements and jet physics results from CDF which constrain the parton density functions (PDFs) are presented. Measurements of the W charge asymmetry, W and Z as well as jet cross sections based on k(T) and midpoint algorithm with up to 1 fb(-1) RunII data are discussed
ATLAS Exotics Searches
No full textSummary of the ATLAS Exotics Results at SUSY 2013 in Trieste. Plenary talk. 30mi
Search for mini-black holes with ATLAS
No full textSUSU09 ATLAS Presentation Models with extra dimensions have been proposed to solve outstanding problems of the SM.In some of those models the strength of gravity is increased at Tev energies and unified with the electroweak interaction. In this case, the production at the LHC of mini-black holes, decaying by Hawking radiation into large multiplicity and highly energetic final states, is expected. The discovery potential of ATLAS to detect those objects in early data is discussed
Search for dilepton resonances in pp collisions at √s=7 TeV with the ATLAS detector
Get PDFThis Letter reports on a search for narrow high-mass resonances decaying into dilepton final states. The data were recorded by the ATLAS experiment in pp collisions at √s=7 TeV at the Large Hadron Collider and correspond to a total integrated luminosity of 1.08 (1.21) fb-1 in the e+e- (μ+μ-) channel. No statistically significant excess above the standard model expectation is observed and upper limits are set at the 95% C.L. on the cross section times branching fraction of Z′ resonances and Randall-Sundrum gravitons decaying into dileptons as a function of the resonance mass. A lower mass limit of 1.83 TeV on the sequential standard model Z′ boson is set. A Randall-Sundrum graviton with coupling k/M̅ Pl=0.1 is excluded at 95% C.L. for masses below 1.63 TeV
The radiation hardness of specific multi-mode and single-mode optical fibres at-25 degrees C beyond a full SLHC dose to a dose of 500 kGy(Si)
No full textThe optical fibres that will be used in SLHC detectors will be exposed to high doses and low temperatures in the inner detectors. A number of single-Mode (sM) and Multi-Mode (MM) fibres have been tested for radiation hardness by exposure beyond a full SLHC dose to 500 kGy(Si) in the -25 °C operating temperatures expected in the upgraded inner detectors. From these measurements conservative estimates of the level of Radiation Induced Absorption (RIA) have been calculated for these fibres in realistic paths through an upgraded inner detector. Two SM fibres have been found whose total calculated RIAs were much lower than the budgeted 1 dB, despite the high dose rates used in the experiment. The RIAs for the DrakaElite Super RadHard Single-Mode Fiber and Fibre X were calculated to be 0.142 and 0.064 dB respectively. Another SM and a MM fibre showed high levels of RIA during the experiment, however they cannot be ruled out as candidate fibres due the the high dose rate of 27 kGy(Si)/hr used. © 2010 IOP Publishing Ltd and SISSA
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