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Carbon Nanomaterials in Clean Energy Hydrogen Systems : Proceedings of the NATO Advanced Research Workhop on Using Carbon Nanomaterials in Clean-Energy Hydrogen Systems, Sudak, Crimea, Ukraine, 22-28 September, 2007 (2008)

Baranowski, B. ; Zaginaichenko, S. ; Schur, D., Skorokhod, V. ; [weitere]

Springer

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Schlagwort(e): Atom ; Fulleren ; Fullerene ; Nanocar ; Nanomaterial ; Nanotube ; Transport ; carbon nanotubes ; electricity

Beschreibung / Inhaltsverzeichnis: The 2007 ARW “Using Carbon Nanomaterials in Clean-Energy Hydrogen Systems” (UCNCEHS’2007) was held in September 22–28, 2007 in the remarkable town Sudak (Crimea, Ukraine) known for its heroic and unusual fate. In the tradition of the earlier conferences, UCNCEHS’2007 meeting served as an multidisciplinary forum for the presentation and discussion of the most recent research on transition to hydrogen-based energy systems, technologies for hydrogen production, storage, utilization, carbon nanomaterials processing and chemical behavior, energy and environmental problems. The aim of UCNCEHS’2007 was to provide the wide overview of the latest scientific results on basic research and technological applications of hydrogen interactions with carbon materials. The active representatives from research/academic organizations and governmental agencies could meet, discuss and present the most recent advances in hydrogen concepts, processes and systems, to evaluate current progress and to exchange academic information, to identify research needs and future development in this important area. This ARW should help further the progress of hydrogen-based science and promote the role of hydrogen and carbon nanomaterials in the energy field.

ISBN: 9781402088988

URL: https://doi.org/10.1007/978-1-4020-8898-8

Sprache: Englisch

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Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at $$ sqrt{s} $$ = 8 TeV (2020)

, ; Aad, G. ; Abbott, B. ; [weitere]

Springer

In: Journal of High Energy Physics. 2020; 2020(8): 51. Published 2020 Aug 01. doi: 10.1007/jhep08(2020)051.

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Publikationsdatum: 2020-08-01

Beschreibung: The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.

Print ISSN: 1126-6708

Digitale ISSN: 1029-8479

Thema: Physik

Publiziert von Springer

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Performance of electron and photon triggers in ATLAS during LHC Run 2 (2020)

Aad, G. ; , ; Abbott, B. ; [weitere]

Springer

In: European Physical Journal C: Particles and Fields. 2020; 80(1): 47. Published 2020 Jan 01. doi: 10.1140/epjc/s10052-019-7500-2.

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Publikationsdatum: 2020-01-01

Print ISSN: 1434-6044

Digitale ISSN: 1434-6052

Thema: Physik

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Search for the HH → $$ boverline{b}boverline{b} $$ process via vector-boson fusion production using proton-proton collisions at $$ sqrt{s} $$ = 13 TeV with the ATLAS detector (2020)

Aad, G. ; , ; Abbott, B. ; [weitere]

Springer

In: Journal of High Energy Physics. 2020; 2020(7): 108. Published 2020 Jul 01. doi: 10.1007/jhep07(2020)108.

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Publikationsdatum: 2020-07-01

Print ISSN: 1126-6708

Digitale ISSN: 1029-8479

Thema: Physik

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Search for direct production of electroweakinos in final states with one lepton, missing transverse momentum and a Higgs boson decaying into two b-jets in $$pp$$ collisions at $$sqrt{s}=13$$ TeV with the ATLAS detector (2020)

Aad, G. ; , ; Abbott, B. ; [weitere]

Springer

In: European Physical Journal C: Particles and Fields. 2020; 80(8): 691. Published 2020 Aug 01. doi: 10.1140/epjc/s10052-020-8050-3.

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Publikationsdatum: 2020-08-01

Beschreibung: The results of a search for electroweakino pair production $$pp ightarrow ilde{chi }^pm _1 ilde{chi }^0_2$$pp→χ~1±χ~20 in which the chargino ($$ilde{chi }^pm _1$$χ~1±) decays into a W boson and the lightest neutralino ($$ilde{chi }^0_1$$χ~10), while the heavier neutralino ($$ilde{chi }^0_2$$χ~20) decays into the Standard Model 125 GeV Higgs boson and a second $$ilde{chi }^0_1$$χ~10 are presented. The signal selection requires a pair of b-tagged jets consistent with those from a Higgs boson decay, and either an electron or a muon from the W boson decay, together with missing transverse momentum from the corresponding neutrino and the stable neutralinos. The analysis is based on data corresponding to 139 $$mathrm {fb}^{-1}$$fb-1 of $$sqrt{s}=13$$s=13 TeV pp collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. No statistically significant evidence of an excess of events above the Standard Model expectation is found. Limits are set on the direct production of the electroweakinos in simplified models, assuming pure wino cross-sections. Masses of $$ilde{chi }^{pm }_{1}/ilde{chi }^{0}_{2}$$χ~1±/χ~20 up to 740 GeV are excluded at 95% confidence level for a massless $$ilde{chi }^{0}_{1}$$χ~10.

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Thema: Physik

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Measurement of single top-quark production in association with a W boson in the single-lepton channel at $$sqrt{s} = 8,ext {TeV}$$ with the ATLAS detector (2021)

Aad, G. ; Abbott, B. ; Abbott, D. C. ; [weitere]

Springer

In: European Physical Journal C: Particles and Fields. 2021; 81(8): 720. Published 2021 Aug 01. doi: 10.1140/epjc/s10052-021-09371-7.

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Publikationsdatum: 2021-08-01

Beschreibung: The production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at $$sqrt{s} = 8,ext {TeV}$$ s = 8 TeV . The dataset corresponds to an integrated luminosity of $$20.2,ext {fb}^{-1}$$ 20.2 fb - 1 , and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the tW signal from the dominant $$t{ ar{t}}$$ t t ¯ background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying W boson. The measured cross-section is $$sigma _{tW} = 26 pm 7,ext {pb}$$ σ tW = 26 ± 7 pb , in good agreement with the Standard Model expectation.

Print ISSN: 1434-6044

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Thema: Physik

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