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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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Combination of inclusive and differential $$ mathrm{t}overline{mathrm{t}} $$ charge asymmetry measurements using ATLAS and CMS data at $$ sqrt{s}=7 $$ and 8 TeV (2018)

, ; Aaboud, M. ; Aad, G. ; [weitere]

Springer

In: Journal of High Energy Physics. 2018; 2018(4): 33. Published 2018 Apr 01. doi: 10.1007/jhep04(2018)033.

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Publikationsdatum: 2018-04-01

Beschreibung: This paper presents combinations of inclusive and differential measurements of the charge asymmetry (A C) in top quark pair $$ left(mathrm{t}overline{mathrm{t}} ight) $$ t t ¯ events with a lepton+jets signature by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The data correspond to integrated luminosities of about 5 and 20 fb−1 for each experiment, respectively. The resulting combined LHC measurements of the inclusive charge asymmetry are A C CHC7 = 0.005 ± 0.007 (stat) ± 0.006(syst) at 7 TeV and A C CHC8 = 0.0055 ± 0.0023 (stat) ± 0.0025 (syst) at 8 TeV. These values, as well as the combination of A C measurements as a function of the invariant mass of the $$ mathrm{t}overline{mathrm{t}} $$ t t ¯ system at 8 TeV, are consistent with the respective standard model predictions.

Print ISSN: 1126-6708

Digitale ISSN: 1029-8479

Thema: Physik