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67 papers found.
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Role of selenium addition to CdZnTe matrix for room-temperature radiation detector applications

Because of its ideal band gap, high density and high electron mobility-lifetime product, cadmium zinc telluride (CdZnTe or CZT) is currently the best room-temperature compound-semiconductor X- and gamma-ray detector material. However, because of its innate poor thermo-physical properties and above unity segregation coefficient for Zn, the wide spread deployment of this material...

Impact of the heavy-quark matching scales in PDF fits

We investigate the impact of displaced heavy-quark matching scales in a global fit. The heavy-quark matching scale \(\mu _{m}\) determines at which energy scale \(\mu \) the QCD theory transitions from \(N_{F}\) to \(N_{F}+1\) in the variable flavor number scheme (VFNS) for the evolution of the parton distribution functions (PDFs) and strong coupling \(\alpha _S(\mu )\). We study...

Parton distribution functions at LO, NLO and NNLO with correlated uncertainties between orders

Sets of parton distribution functions (PDFs) of the proton are reported for the leading (LO), next-to-leading (NLO) and next-to-next-to-leading-order (NNLO) QCD calculations. The parton distribution functions are determined with the HERAFitter program using the data from the HERA experiments and preserving correlations between uncertainties for the LO, NLO and NNLO PDF sets. The...

Novel ZnO:Al contacts to CdZnTe for X- and gamma-ray detectors

CdZnTe (CZT) has made a significant impact as a material for room-temperature nuclear-radiation detectors due to its potential impact in applications related to nonproliferation, homeland security, medical imaging, and gamma-ray telescopes. In all such applications, common metals, such as gold, platinum and indium, have been used as electrodes for fabricating the detectors...

QCD analysis of W- and Z-boson production at Tevatron

Recent measurements of the W-boson charge asymmetry and of the Z-boson production cross sections, performed at the Tevatron collider in Run II by the D0 and CDF collaborations, are studied using the HERAFitter framework to assess their impact on the proton parton distribution functions (PDFs). The Tevatron measurements, together with deep-inelastic scattering data from HERA, are...

Measurement of colour flow using jet-pull observables in \(t\bar{t}\) events with the ATLAS experiment at \(\sqrt{s} = 13\,\hbox {TeV}\)

Previous studies have shown that weighted angular moments derived from jet constituents encode the colour connections between partons that seed the jets. This paper presents measurements of two such distributions, the jet-pull angle and jet-pull magnitude, both of which are derived from the jet-pull angular moment. The measurement is performed in \(t\bar{t}\) events with one...

Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1

The reconstruction of the signal from hadrons and jets emerging from the proton–proton collisions at the Large Hadron Collider (LHC) and entering the ATLAS calorimeters is based on a three-dimensional topological clustering of individual calorimeter cell signals. The cluster formation follows cell signal-significance patterns generated by electromagnetic and hadronic showers. In...

Performance of algorithms that reconstruct missing transverse momentum in \(\sqrt{s}\) = 8 TeV proton–proton collisions in the ATLAS detector

The reconstruction and calibration algorithms used to calculate missing transverse momentum (\(E_{\text {T}}^{\text {miss}}\) ) with the ATLAS detector exploit energy deposits in the calorimeter and tracks reconstructed in the inner detector as well as the muon spectrometer. Various strategies are used to suppress effects arising from additional proton–proton interactions, called...

Search for lepton-flavour-violating decays of the Higgs and Z bosons with the ATLAS detector

Direct searches for lepton flavour violation in decays of the Higgs and Z bosons with the ATLAS detector at the LHC are presented. The following three decays are considered: \(H\rightarrow e\tau \), \(H\rightarrow \mu \tau \), and \(Z\rightarrow \mu \tau \). The searches are based on the data sample of proton–proton collisions collected by the ATLAS detector corresponding to an...

Measurement of the \(b\overline{b}\) dijet cross section in pp collisions at \(\sqrt{s} = 7\)  TeV with the ATLAS detector

The dijet production cross section for jets containing a b-hadron (b-jets) has been measured in proton–proton collisions with a centre-of-mass energy of \(\sqrt{s} = 7\) TeV, using the ATLAS detector at the LHC. The data used correspond to an integrated luminosity of \(\mathrm 4.2\,\text {fb}^{-1}\). The cross section is measured for events with two identified b-jets with a...

Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data

The algorithms used by the ATLAS Collaboration to reconstruct and identify prompt photons are described. Measurements of the photon identification efficiencies are reported, using 4.9 fb\(^{-1}\) of pp collision data collected at the LHC at \(\sqrt{s} = 7\) \(\text {TeV}\) and 20.3 fb\(^{-1}\) at \(\sqrt{s} = 8\) \(\text {TeV}\). The efficiencies are measured separately for...

Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data

The algorithms used by the ATLAS Collaboration to reconstruct and identify prompt photons are described. Measurements of the photon identification efficiencies are reported, using 4.9 fb\(^{-1}\) of pp collision data collected at the LHC at \(\sqrt{s} = 7\) \(\text {TeV}\) and 20.3 fb\(^{-1}\) at \(\sqrt{s} = 8\) \(\text {TeV}\). The efficiencies are measured separately for...

Luminosity determination in pp collisions at \(\sqrt{s}\) = 8 TeV using the ATLAS detector at the LHC

The luminosity determination for the ATLAS detector at the LHC during pp collisions at \(\sqrt{s} =\) 8 TeV in 2012 is presented. The evaluation of the luminosity scale is performed using several luminometers, and comparisons between these luminosity detectors are made to assess the accuracy, consistency and long-term stability of the results. A luminosity uncertainty of \(\delta...

Search for the Standard Model Higgs boson produced by vector-boson fusion and decaying to bottom quarks in \( \sqrt{s}=8 \) TeV pp collisions with the ATLAS detector

A search with the ATLAS detector is presented for the Standard Model Higgs boson produced by vector-boson fusion and decaying to a pair of bottom quarks, using 20.2 fb−1 of LHC proton-proton collision data at \( \sqrt{s}=8 \) TeV. The signal is searched for as a resonance in the invariant mass distribution of a pair of jets containing b-hadrons in vector-boson-fusion candidate...

Measurements of top-quark pair differential cross-sections in the lepton+jets channel in pp collisions at \(\sqrt{s}=8\,~{\mathrm {TeV}}\) using the ATLAS detector

Measurements of normalized differential cross-sections of top-quark pair production are presented as a function of the top-quark, \(t\bar{t}\) system and event-level kinematic observables in proton–proton collisions at a centre-of-mass energy of \(\sqrt{s}=8\,\mathrm{TeV}\). The observables have been chosen to emphasize the \(t\bar{t}\) production process and to be sensitive to...

Study of the rare decays of \(B^0_s\) and \(B^0\) into muon pairs from data collected during the LHC Run 1 with the ATLAS detector

A study of the decays \(B^0_s \rightarrow \mu ^+\mu ^-\) and \(B^0 \rightarrow \mu ^+\mu ^-\) has been performed using data corresponding to an integrated luminosity of 25 fb\(^{-1}\) of 7 and 8 TeV proton–proton collisions collected with the ATLAS detector during the LHC Run 1. For the \(B^0\) dimuon decay, an upper limit on the branching fraction is set at \(\mathcal{B}(B^0...

Search for single production of vector-like quarks decaying into Wb in pp collisions at \(\sqrt{s} = 8\)  TeV with the ATLAS detector

A search for singly produced vector-like Q quarks, where Q can be either a T quark with charge \(+2/3\) or a Y quark with charge \(-4/3\), is performed in proton–proton collisions recorded with the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 20.3 fb\(^{-1}\) and was produced with a centre-of-mass energy of \(\sqrt{s}=8\) TeV. This analysis...

Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at \( \sqrt{s}=7 \) and 8 TeV

Combined ATLAS and CMS measurements of the Higgs boson production and decay rates, as well as constraints on its couplings to vector bosons and fermions, are presented. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a W or a Z boson or a pair of top quarks, and of the six decay modes...