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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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Digitale Medien

Individual study of chromium in the stainless steel implants degradation: An experimental study in mice (1999)

Carmo Pereira, Maria do ; de Lourdes Pereira, Maria ; Sousa, João Paulo

Springer

BioMetals 12 (1999), S. 277-282

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ISSN: 1572-8773

Schlagwort(e): biomaterial ; chromium ; histology ; mice organs

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Abstract To study the accumulation and the histological effects in mice organs caused by hexavalent chromium, one of the corrosion products released from AISI 316L stainless steel implants, mice groups were subcutaneously injected with a metallic solution of chromium during a certain period of time. Similar injections were made with HBSS (Hank's Balanced Salt Solution) in other groups to be used as controls. The levels of chromium found in the liver, kidney and spleen of the control and the treated animals were obtained by atomic absorption spectrometry (AAS) and were compared to those obtained by AdSV (adsorptive stripping voltammetry) to test the accuracy of the results. During the experimental period, the liver and spleen showed a progressive and significant accumulation of chromium whereas in the kidney the significant accumulation found after the first week practically remained unchanged during the four weeks. Apparently, the histological analysis of these tissues did not evidence any relevant morphological alteration induced by the chromium accumulations during the four weeks of treatment.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1009249700719

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Digitale Medien

Photocontrol of seed germination in Impatiens wallerana Hook. f. (1994)

Souza, Rogéria Pereira ; Pereira, Maria de Fátima A.

Springer

Plant growth regulation 14 (1994), S. 249-256

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ISSN: 1573-5087

Schlagwort(e): Impatiens wallerana ; photocontrol ; seed germination

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Abstract General characteristics of light sensitivity of Impatients wallerana seeds were investigated. Germination was absolutely dependent on light, irrespective of temperature. High percentages of germination were obtained by exposure to long periods of illumination or, alternatively, to several repeated short irradiations with red light. In this case, responsiveness to light was not altered by increasing either the initial incubation period in darkness or the dark intervals between short exposures. Effects of red light were reversed by far-red light, thus demonstrating the involvement of phytochrome. Evidence was presented for an interactive effect, of unknown physiological nature between red and far-red light on the germination of the seeds.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00024800

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Digitale Medien

Purification of Neurospora crassa alkaline phosphatase without DNAse activity for use in molecular biology (1995)

Pereira, M. ; Pereira, H. ; Thedei, G. ; [weitere]

Springer

World journal of microbiology and biotechnology 11 (1995), S. 505-507

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ISSN: 1573-0972

Schlagwort(e): Alkaline phosphatase ; fungi ; molecular biology ; Neurospora crassa

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Abstract Alkaline phosphatase, excreted by Neurospora crassa preg c and purified to apparent homogeneity by 7.5% PAGE, did not show DNAase activity and removed the terminal 5′-phosphate group from plasmid Bluescript M13+ linearized with EcoRI. The preg c strain may therefore replace other sources of alkaline phosphatase for use in dephosphorylating linearized plasmidial DNA in cloning experiments.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00286362

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