Showing papers by "Vladimir Peshekhonov published in 2008"
Posted Content•
TL;DR: In this article, a detailed study of the expected performance of the ATLAS detector is presented, together with the reconstruction of tracks, leptons, photons, missing energy and jets, along with the performance of b-tagging and the trigger.
Abstract: A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on simulations of the detector and physics processes, with particular emphasis given to the data expected from the first years of operation of the LHC at CERN.
1,160 citations
TL;DR: In this paper, a straw proportional counter is the basic element of the ATLAS Transition Radiation Tracker (TRT) and its detailed properties as well as the main properties of a few TRT operating gas mixtures are described.
Abstract: A straw proportional counter is the basic element of the ATLAS Transition Radiation Tracker (TRT). Its detailed properties as well as the main properties of a few TRT operating gas mixtures are described. Particular attention is paid to straw tube performance in high radiation conditions and to its operational stability.
123 citations
TL;DR: The ATLAS TRT barrel as mentioned in this paper is a tracking drift chamber using 52,544 individual tubular drift tubes, which is one part of the ATLAS Inner Detector, which consists of three sub-systems: the pixel detector spanning the radius range 4 to 20 cm, the semiconductor tracker (SCT) from 30 to 52 cm, and the transition radiation tracker (TRT) from 56 to 108 cm.
Abstract: The ATLAS TRT barrel is a tracking drift chamber using 52,544 individual tubular drift tubes. It is one part of the ATLAS Inner Detector, which consists of three sub-systems: the pixel detector spanning the radius range 4 to 20 cm, the semiconductor tracker (SCT) from 30 to 52 cm, and the transition radiation tracker ( TRT) from 56 to 108 cm. The TRT barrel covers the central pseudo-rapidity region |eta| < 1, while the TRT endcaps cover the forward and backward eta regions. These TRT systems provide a combination of continuous tracking with many measurements in individual drift tubes ( or straws) and of electron identification based on transition radiation from fibers or foils interleaved between the straws themselves. This paper describes the recently-completed construction of the TRT Barrel detector, including the quality control procedures used in the fabrication of the detector.
97 citations
TL;DR: The ATLAS TRT end-cap as mentioned in this paper is a tracking drift chamber using 245,760 individual tubular drift tubes, which is a part of the TRT tracker which consist of the barrel and two end-caps.
Abstract: The ATLAS TRT end-cap is a tracking drift chamber using 245,760 individual tubular drift tubes. It is a part of the TRT tracker which consist of the barrel and two end-caps. The TRT end-caps cover the forward and backward pseudo-rapidity region 1.0 < vertical bar eta vertical bar < 2.0, while the TRT barrel central eta region vertical bar eta vertical bar < 1.0. The TRT system provides a combination of continuous tracking with many measurements in individual drift tubes ( or straws) and of electron identification based on transition radiation from fibers or foils interleaved between the straws themselves. Along with other two sub-systems, namely the Pixel detector and Semi Conductor Tracker (SCT), the TRT constitutes the ATLAS Inner Detector. This paper describes the recently completed and installed TRT end-cap detectors, their design, assembly, integration and the acceptance tests applied during the construction.
77 citations
TL;DR: The semi-inclusive difference asymmetry for hadrons of opposite charge has been measured by the COMPASS experiment at CERN as discussed by the authors, where the first moment of Δ u v + Δ d v was found to be equal to 0.40 ± 0.07 (stat. ) ±0.06 ( syst. ) over the measured range of x at Q 2 = 10 ( GeV / c ) 2.
77 citations
TL;DR: In this paper, the results of a series of noise and cross-talk tests on the SCT and TRT in their final assembled configuration, using final readout and supply hardware and software, are reported.
Abstract: The ATLAS (A Toroidal LHC ApparatuS) Inner Detector provides charged particle tracking in the centre of the ATLAS experiment at the Large Hadron Collider (LHC). The Inner Detector consists of three subdetectors: the Pixel Detector, the Semiconductor Tracker (SCT), and the Transition Radiation Tracker (TRT). This paper summarizes the tests that were carried out at the final stage of SCT+TRT integration prior to their installation in ATLAS. The combined operation and performance of the SCT and TRT barrel and endcap detectors was investigated through a series of noise tests, and by recording the tracks of cosmic rays. This was a crucial test of hardware and software of the combined tracker detector systems. The results of noise and cross-talk tests on the SCT and TRT in their final assembled configuration, using final readout and supply hardware and software, are reported. The reconstruction and analysis of the recorded cosmic tracks allowed testing of the offline analysis chain and verification of basic tracker performance parameters, such as efficiency and spatial resolution, in combined operation before installation.
49 citations
TL;DR: The ATLAS inner detector consists of three sub-systems: the pixel detector spanning the radius range 4cm-20cm, the semiconductor tracker at radii from 30 to 52 cm, and the transition radiation tracker (TRT), tracking from 56 to 107 cm as mentioned in this paper.
Abstract: The ATLAS inner detector consists of three sub-systems: the pixel detector spanning the radius range 4cm-20cm, the semiconductor tracker at radii from 30 to 52 cm, and the transition radiation tracker (TRT), tracking from 56 to 107 cm. The TRT provides a combination of continuous tracking with many projective measurements based on individual drift tubes (or straws) and of electron identification based on transition radiation from fibres or foils interleaved between the straws themselves. This paper describes the on and off detector electronics for the TRT as well as the TRT portion of the data acquisition (DAQ) system.
36 citations
11 Jan 2008-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a high-granularity straw tracking chamber has been designed and tested to reduce the occupancy of the large-size coordinate detectors, and the main tasks were to improve the detector granularity and provide the best value of the detector radiation thickness.
Abstract: To reduce the occupancy of the large-size coordinate detectors, the high-granularity straw tracking chamber has been designed and tested. The main tasks were to improve the detector granularity and provide the best value of the detector radiation thickness. We have developed the techniques of the multiple anode production, assembling of the segmented straws and the low-mass readout by means of flat cable. Testing of the constructed prototypes has shown that these techniques can be applied to build the high-granularity straw detectors.
16 citations
Journal Article•
TL;DR: In this article, the first measurement of the gluon polarisation in the nucleon based on the photon-gluon fusion process tagged by charmed meson production and decay to charged K and pi was presented.
Abstract: We present the first measurement of the gluon polarisation in the nucleon based on the photon-gluon fusion process tagged by charmed meson production and decay to charged K and pi. The data were collected in polarised muon scattering off a polarised deuteron target by the COMPASS collaboration at CERN during 2002-2004. The result of this LO analysis is _x = -0.47 +- 0.44 (stat) +- 0.15 (syst) at ~= 0.11 and a scale mu^2 ~ 13 (GeV/c)^2.
15 citations
TL;DR: In this article, lines for transmitting the signals of high-granulated coordinate straw detectors from the detector sensitive area to the remote readout electronics are simulated, and samples of these lines are investigated.
Abstract: Lines for transmitting the signals of high-granulated coordinate straw detectors from the detector sensitive area to the remote readout electronics are simulated, and samples of these lines are investigated. The possibility of transmitting the signals using lines with a length of up to 2 m without distortions is shown. These lines can also be used to supply a high voltage of up to 3 kV to the straw segments with negligible leakage currents.
5 citations
TL;DR: In this article, the design of thin-wall drift tubes filled with a gas at a high differential pressure (up to 4 bar) is described, and the results of studying them are presented.
Abstract: The design of thin-wall drift tubes filled with a gas at a high differential pressure (up to 4 bar) is described, and the results of studying them are presented. A method for strengthening the tube walls with carbon filaments for compensating for changes in their linear dimensions upon changes in the differential pressure is considered. It is shown that these tubes can be used for developing planar position detectors of charged particles and photons.
TL;DR: In this article, the drift tracker for the SVD-2 setup at the U-70 accelerator of the Institute for High Energy Physics (Protvino, Russia) is described.
Abstract: The design and the characteristics of a drift tracker for the SVD-2 setup at the U-70 accelerator of the Institute for High Energy Physics (Protvino, Russia) are described The drift tracker has been developed to improve the quality of track reconstruction in high-multiplicity events It is composed of 2304 drift tubes with a diameter of 6 mm and a sensitive region 500–900 mm long The distance between a track and the anode wire is determined from the drift time The coordinate resolution and the detection efficiency of the tubes have been determined from the data of the accelerator run in 2006