A beginners guide to the SVXII

Yarema, R.; Kipnis, I.; Kleinfelder, S.; Luo, Linqing; Milgrome, O.; Sarraj, M.; Zimmerman, T.

doi:10.2172/10169918

Cited by 16 publications

(7 citation statements)

References 2 publications

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“…They are read out using 128-channel SVXIIe chips [125], that include a preamplifier, a 32-cell analog pipeline, and an analog-to-digital converter (ADC) with a sparse readout. The SVXIIe chips produce heat that could lead to type conversion and increase the depletion voltage of the silicion sensors.…”

Section: Smtmentioning

confidence: 99%

“…An advantage in the use of Decision Tree is that they are insensitive to additional variables, as long as they are well-modeled. It is obvious that an extra variable that has not enough separation power to be the best variable x i used for splitting in any of the nodes just increases the time it 125 6 Analysis Strategy and Software Algorithms takes to build the tree, but does not affect its performance. However, statistical fluctuations in the training sample can lead to different tree structures and thus to a different classifier response.…”

Section: Boosted Decision Trees As a Multivariate Classifiermentioning

confidence: 99%

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Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

Kirsch

2009

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Diese Dissertation ist auf den Internetseiten der Hochschulbibliothek online verfügbar. ZusammenfassungIn der vorliegenden Analyse wird in einem etwa 1 fb −1 an integrierter Luminosität umfassenden Datensatz des DØ-Experiments nach der Produktion einzelner Top-Quarks mittels elektroschwacher Wechselwirkung gesucht. Die Ereignisse wurden am Tevatron-Beschleuniger des Fermi National Accelerator Laboratory, angesiedelt in Batavia, IL, USA, in ProtonAntiproton-Kollisionen bei einer Schwerpunktsenergie von √ s = 1.96 TeV aufgezeichnet. Die Analyse konzentriert sich dabei auf die Messung des kombinierten Wirkunsquerschnitts des s-(tb) und des t-Kanal-(tqb) Produktionsmechanismus:pp → tb + X, tqb + X.Betrachtet werden hierbei Endzustände in denen das W Boson, welches beim Zerfall des Top-Quarks entsteht, im Weiteren in ein Elektron oder ein Myon sowie ein entsprechendes Neutrino zerfällt. Dieser Wirkungsquerschnitt ist direkt proportional zum Quadrat des CKMMatrixelements |V tb | und erlaubt somit dessen Messung ohne zusätzliche Annahmenüber die Unitarität der CKM-Matrix oder die Anzahl der Fermion-Generationen im Standardmodell der Elementarteilchenphysik. Eine Messung des Produktionswirkungsquerschnittes einzelner Top-Quarks ermöglicht somit einen direkten Test der V-A-Struktur der elektroschwachen Wechselwirkung. Die Ereignisse werden zunächst in einer sogenannten IntroductionTo understand the composition of matter and the fundamental forces of nature is an aim that has been driving human kind for centuries. On large scales the theory of general relativity [1] describes the clustering of galaxies and the movement of planets around the sun due to gravity. The theory of general relativity extends the Newtonian gravity [2] that is able to explain the falling of apples from trees. On small scales, scattering experiments are performed to find the elementary particles matter is built of. It has been shown that atoms consist of electrons and nucleons [3], and that even the nucleons are not elementary. Their basic constitutents are called quarks [4]. The quark model led to the development of Quantum ChromoDynamics (QCD), explaining the behaviour of the strong force. Furthermore, the weak and the electromagnetic forces could be unified in the Glashow-Weinberg-Salam (GWS) model. Building upon much earlier work, in the 1960s and 1970s the Standard Model of elementary particle physics was developed, a quantum field theory describing the interactions at very small scales, including all fundamental forces except for gravity.At particle accelerators the Standard Model has been tested and will be tested further to a great precision [5]. The data analyzed in this thesis have been collected at the world's highest energetic-collider, the Tevatron, located at the Fermi National Accelerator Laboratory (FNAL) in the vicinity of Chicago, IL, USA. There, protons and antiprotons are collided at a center-of-mass energy of √ s = 1.96 TeV. The discovery of the top quark [6,7] was one of the remarkable results not only for the CDF and DØ exp...

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Section: Smtmentioning

confidence: 99%

Section: Boosted Decision Trees As a Multivariate Classifiermentioning

confidence: 99%

Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

Kirsch

2009

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“…The silicon modules are divided into strips with a 50 µm pitch. When a charge particle passes through the strips, it will create electron-hole pairs which will produce a charge pulse that is integrated and readout via custommade SVXIIe chips [17]. The collection of spatial information from these hits allows for the reconstruction of the particle path or track.…”

Section: Silicon Microstrip Tracker (Smt)mentioning

confidence: 99%

“…Since there are significant bin-to-bin correlations, the χ 2 value is calculated with the full covariance matrix: 17) where N i is the number of observed candidate events in the i th bin, µ i is the number of expected candidate events in the i th bin, and w ij is the corresponding element from the inverse of the covariance matrix (V ) given by: For the shape test, the predicted shapes from the two sets of couplings with (κ = 0, λ = −1) and (κ = −1, λ = 0) are used. Since this is a shape test, the normalization for the two anomalous couplings is allowed to float to produce the best fit with the observed background subtracted data.…”

Section: Rapidity Difference For Prompt W γ Productionmentioning

confidence: 99%

The Study of Wγ production at D0: Anomalous Coupling Limits and the Radiation Amplitude Zero

Pawloski

2007

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The Study of W γ Production at DØ: Anomalous Coupling Limits and the Radiation Amplitude Zero by Gregory J. Pawloski W γ production is analyzed in the electron and muon decay channels with approximately 1 f b −1 of data from pp collisions that were produced at a center-ofmass energy of √ s = 1.96 T eV and that were collected by the DØ detector at the Fermilab Tevatron collider. The inclusive pp → νγ cross section is measured in both channels and is found to be consistent with the Standard Model expectation of 2.08 ± 0.05 P DF pb for events with a photon E T > 11 GeV , ∆R γ > 0.7, and νγ transverse mass greater than 90 GeV . The observed cross section is measured to be 2.05 ± 0.18 stat ± 0.10 sys ± 0.13 lumi pb and 1.72 ± 0.19 stat ± 0.15 sys ± 0.10 lumi pb for the electron and muon channels respectively.The photon E T spectrum is examined for indications of anomalous W W γ couplings. No evidence is found, and the following one-dimensional limits are set at a 95% confidence level: −0.18 < λ < 0.18 and 0.16 < κ < 1.84.iiiThe observed charge-signed photon-lepton rapidity difference is consistent with the Standard Model prediction and is indicative of the theoretically expected radiation amplitude zero. The distribution exhibits a bimodal structure which is expected from the destructive interference, with the unimodal hypothesis being ruled out at the 94% confidence level.

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“…The SIFT chip outputs an analog signal to the SVXIIe for digitization. The SVXIIe chip functionality is described in [65]. It was designed for the silicon tracker readout but is well suited to the fiber tracker readout as well.…”

Section: Central Fiber Trackermentioning

confidence: 99%

Search for Doubly-charged Higgs Boson Production in the Decay H++ H--→ μ+μ+μ-μ- with 1.1 fb-1 at D0 Detector

Kim

2007

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A beginners guide to the SVXII

Cited by 16 publications

References 2 publications

Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

The Study of Wγ production at D0: Anomalous Coupling Limits and the Radiation Amplitude Zero

Search for Doubly-charged Higgs Boson Production in the Decay H<sup>++</sup> H<sup>--</sup>→ μ<sup>+</sup>μ<sup>+</sup>μ<sup>-</sup>μ<sup>-</sup> with 1.1 fb<sup>-1</sup> at D0 Detector

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