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  • 1
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    Search for chargino-neutralino production in events with Higgs and W bosons using 137 fb−1 of proton-proton collisions at $$ sqrt{s} $$ = 13 TeV (2021)
    Springer
    Details
    Publication Date: 2021-10-01
    Description: A search for electroweak production of supersymmetric (SUSY) particles in final states with one lepton, a Higgs boson decaying to a pair of bottom quarks, and large missing transverse momentum is presented. The search uses data from proton-proton collisions at a center-of-mass energy of 13 TeV collected using the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb−1. The observed yields are consistent with backgrounds expected from the standard model. The results are interpreted in the context of a simplified SUSY model of chargino-neutralino production, with the chargino decaying to a W boson and the lightest SUSY particle (LSP) and the neutralino decaying to a Higgs boson and the LSP. Charginos and neutralinos with masses up to 820 GeV are excluded at 95% confidence level when the LSP mass is small, and LSPs with mass up to 350 GeV are excluded when the masses of the chargino and neutralino are approximately 700 GeV.
    Print ISSN: 1126-6708
    Electronic ISSN: 1029-8479
    Topics: Physics
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  • 2
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    Measurements of Higgs boson production cross sections and couplings in the diphoton decay channel at $$ sqrt{mathrm{s}} $$ = 13 TeV (2021)
    Springer
    Details
    Publication Date: 2021-07-01
    Description: Measurements of Higgs boson production cross sections and couplings in events where the Higgs boson decays into a pair of photons are reported. Events are selected from a sample of proton-proton collisions at $$ sqrt{s} $$ s = 13 TeV collected by the CMS detector at the LHC from 2016 to 2018, corresponding to an integrated luminosity of 137 fb−1. Analysis categories enriched in Higgs boson events produced via gluon fusion, vector boson fusion, vector boson associated production, and production associated with top quarks are constructed. The total Higgs boson signal strength, relative to the standard model (SM) prediction, is measured to be 1.12±0.09. Other properties of the Higgs boson are measured, including SM signal strength modifiers, production cross sections, and its couplings to other particles. These include the most precise measurements of gluon fusion and vector boson fusion Higgs boson production in several different kinematic regions, the first measurement of Higgs boson production in association with a top quark pair in five regions of the Higgs boson transverse momentum, and an upper limit on the rate of Higgs boson production in association with a single top quark. All results are found to be in agreement with the SM expectations.
    Print ISSN: 1126-6708
    Electronic ISSN: 1029-8479
    Topics: Physics
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  • 3
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    Measurements of the pp → W±γγ and pp → Zγγ cross sections at $$ sqrt{mathrm{s}} $$ = 13 TeV and limits on anomalous quartic gauge couplings (2021)
    Springer
    Details
    Publication Date: 2021-10-01
    Description: The cross section for W or Z boson production in association with two photons is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data set corresponds to an integrated luminosity of 137 fb−1 collected by the CMS experiment at the LHC. The W → ℓν and Z → ℓℓ decay modes (where ℓ = e, μ) are used to extract the Wγγ and Zγγ cross sections in a phase space defined by electron (muon) with transverse momentum larger than 30 GeV and photon transverse momentum larger than 20 GeV. All leptons and photons are required to have absolute pseudorapidity smaller than 2.5. The measured cross sections in this phase space are σ(Wγγ) = $$ {13.6}_{-1.9}^{+1.9}{left(mathrm{stat} ight)}_{-4.0}^{+4.0} $$ 13.6 − 1.9 + 1.9 stat − 4.0 + 4.0 (syst) ± 0.08 (PDF + scale) fb and σ(Zγγ) = $$ {5.41}_{-0.55}^{+0.58}{left(mathrm{stat} ight)}_{-.070}^{+0.64} $$ 5.41 − 0.55 + 0.58 stat − .070 + 0.64 (syst) ± 0.06 (PDF + scale) fb. Limits on anomalous quartic gauge couplings are set in the framework of an effective field theory with dimension-8 operators.
    Print ISSN: 1126-6708
    Electronic ISSN: 1029-8479
    Topics: Physics
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  • 4
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    Study of Z boson plus jets events using variables sensitive to double-parton scattering in pp collisions at 13 TeV (2021)
    Springer
    Details
    Publication Date: 2021-10-01
    Description: Double-parton scattering is investigated using events with a Z boson and jets. The Z boson is reconstructed using only the dimuon channel. The measurements are performed with proton-proton collision data recorded by the CMS experiment at the LHC at $$ sqrt{s} $$ s = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1 collected in the year 2016. Differential cross sections of Z+ ≥1 jet and Z+ ≥2 jets are measured with transverse momentum of the jets above 20 GeV and pseudorapidity |η|
    Print ISSN: 1126-6708
    Electronic ISSN: 1029-8479
    Topics: Physics
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  • 5
    Electronic Resource
    Electronic Resource
    Nutrient dynamics within amazonian forests (1988)
    Springer
    Oecologia 76 (1988), S. 222-235 
    Details
    ISSN: 1432-1939
    Keywords: Amazonian forests ; Root growth ; Nutrient release ; Organic matter decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Relationships between fine root growth, rates of litter decomposition and nutrient release were analysed in a mixed forest on Tierra Firme, a Tall Amazon Caatinga and a Low Bana on podsolized sands near San Carlos de Rio Negro. Fine root growth in the upper soil layers (root mat+10 cm upper soil) was considerably higher in the Tierra Firme forest (1117 g m-2 yr-1) than in tall Cattinga (120) and Bana (235). Fine root growth on top of the root mat was stimulated significantly by added N in Tall Caatinga and Low Bana forests, by P in Tierra Firme and Bana forests, and by Ca only in the Tierra Firme forest. Rate of fine root growth in Tierra Firme forest on fresh litter is strongly correlated with the Mg and Ca content of litter. Rate of litter decomposition was inversely related to % lignin and the lignin/N ratio of litter. Litter contact with the dense root mat of the Tierra Firme increased rates of disappearance for biomass, Ca and Mg as compared with litter permanently separated or lifted weekly from the root mat to avoid root attachment. Nitrogen concentration of decomposing litter increased in all forests, net N released being observed only in Caryocar glabrum and Aspidosperma megalocarpum of the Tierra Firme forest after one year of exposure. Results emphasize the differences in limiting nutrients in amazonian forest ecosystems on contrasting soil types: Tierra Firme forests are particularly limited by Ca and Mg, while Caatinga and Bana forests are limited mainly by N availability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379956
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  • 6
    Electronic Resource
    Electronic Resource
    Nutrient dynamics within amazonian forest ecosystems (1986)
    Springer
    Oecologia 68 (1986), S. 466-472 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A comparative analysis on the rate of fine litterfall and its associated nutrient fluxes was carried out in a mixed forest on Tierra Firme, a tall Amazon Caatinga and a Bana on podsolized sands near San Carlos de Rio Negro. There was seasonality in leaf fall and total litterfall in mixed forest and tall Amazon Caatinga forest but no definite trend in the Bana. Litterfall curves were significantly correlated among sites indicating common regulating factors in the three forests. Leaf litter from mixed forest on Tierra Firme was richer in N with extremely low Ca and Mg concentrations; tall Amazon Caatinga litter had higher P and Mg concentration, while Bana litter was low in N but K concentration was twice as high as in the other two forests. Annual fine litterfall in Tierra Firme mixed forest was nearly 4 times higher than in Bana, But N flux was 10 times higher, while Ca and Mg fluxes were similar. Tall Amazon Caatinga had Ca and Mg fluxes in litterfall 2–3 times higher than the other two forests. Within-stand efficiency of nitrogen, calcium and magnesium use, as measured by biomass/nutrient ratios, differentiates Tierra Firme from Caatinga and Bana forest: Tierra Firme has the lowest N, but the highest Ca and Mg use efficiencies. Higher P use efficiency was measured in Bana followed by Tierra Firme and Caatinga; while Tierra Firme and Caatinga showed similar higher K use efficiencies than Bana. N/P ratios indicates that Tierra Firme forest is limited by P availability, while low N availability predominates in Caatinga. Bana appears limited by both N and P. These differences probably relate to variations in degree of sclerophylly and leaf duration which determine leaf nutrient concentrations in the ecosystems studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01036756
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  • 7
    Electronic Resource
    Electronic Resource
    Transitions de phases du pDCB et diagrammes de phases pDCB-pDBB et pDCB-pBCB (1988)
    Springer
    Journal of thermal analysis and calorimetry 34 (1988), S. 537-542 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Phasendiagramme der zwei binären organischen Systemen [p-Dichlorbenzen (pDCB)/p-Bromchlorbenzen (pBCB) und p-Dichlorbenzen/p-dibrombenzen (pDBB)] wurden mittels Röntgendiffraktometrie und thermischer Methoden untersucht. Die Definition und Anwendung eines „Formfaktors“ des thermischen Signals erlaubt, auf das Vorliegen einer sehr nahen eutektischen Invariante in beiden Systemen zu schließen. Diese eutektische Invariante ist auf das Polymorphiephänomen [α-β] zurückzuführen, das bei reinem pDCB und an pDCB reichen Gemischen zur Geltung kommt. Andererseits kann, besonders beim zweiten System, die sehr geringe Weite der Fest-Flüssig-Schleife (〈1 K) nur mit Hilfe des „Formfaktors“ ermittelt werden.
    Abstract: Резюме С помощью рентгенофа зового анализа и термических методов определены фазовые диаграммы для органи ческих бинарных сист ем п-дихлорбензол — п-бро мхлорбензол и пдихло рбензол — п-дибромбензол. Опре деление и использова ние «порядкового коэффи циента» термических сигнало в позволило предполо жить существование в обои х системах очень узко й эвтектической инвар иантности. Эта эвтект ическая инвариантность обус ловленаа−β) полимор физмом, затрагивающим п-дихл орбензол и обогащенн ые им смеси. С другой стороны, использование «поря дкового коэффициент а» позволило, особенно в случае второй систем ы, определить очень мал ую (〈 1 К) ширину солидус — ликвидус петли.
    Notes: Abstract The phase diagrams of two organic binary systems [p-dichlorobenzene (pDCB) — p-bromochlorobenzene (pBCB)] and [p-dichlorobenzene—p-dibromobenzene (pDBB)] have been determined by X-ray diffraction and thermal methods. The definition and the use of a “form factor” of the thermal signals allows to involve the existence of a very narrow eutectic invariant in the two systems. This eutectic invariant is due to the polymorphism phenomena [α-β] affecting pure pDCB and rich pDCB alloys. On the other hand in particular for the second system, only the use of the “form factor” permits the very small width of the solidus-liquidus loop (〈1 K) to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913196
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  • 8
    Electronic Resource
    Electronic Resource
    Polymorphisme du tetrachloro-1,2,4,5 benzene et du tetrabromo-1,2,4,5 benzene (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 2491-2500 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine Kombination dreier thermoanalytischer Methoden (Hot-stage Polarisationsmikroskop, DSC, Guinier-Lenne) ermöglichte die Bestimmung des polymorphen Verhaltens von Tetra-1,2,4,5-X-benzol (X=Cl, Br). Es wurde eine thermische, kalorimetrische und kristallographische Charakterisierung durchgeführt. Diese Untersuchung wirft ein interessantes Problem auf: dieβ-Phase (P21/a, stabil bei RT) von Tetrachlorbenzol besitzt eine ähnliche Konfiguration wie die zwei Festphasen P21/a von Tetrabromobenzol. Welche dieser beiden Formen ist mit Tetrachlorbenzol isomorph?
    Abstract: Резюме Комбинация трех мето дов термического ана лиза (поляризационная мик роскопия с нагревом, ДСК, Гюнье-Ле нн) позолила установи ть полиморфный характе р 1,2,4,5-тетра-Хбензолов, где X=Сl или Вг. Проведен ы термические, калориметрические и кристаллографическ ие измерения. Проведе нное исследование выявил о интересную проблем у:β-фаза тетрахлорбенз ола (устойчива при ком натной температуре и имеюща я симметрию P2j/a) подобна двум твердот ельным фазам тетрабр омбензола с симметрией Р21/а. Какая из этих двух форм действительно и зоморфна сβ-фазой тетрахлорбензола, тр ебует дальнеших иссл едований.
    Notes: Abstract Combination of three techniques of thermal analysis (hot stage polarising microscope, DSC, Guinier-Lenne) enabled the determination of the polymorphic behaviour of tetra 1,2,4,5-X benzene (X=Cl, Br). Thermal, calorimetric and crystallographic characterizations have been carried out. This study puts forward an interesting problem: theβ phase (P21/a, stable at room temperature) of the tetra chlorobenzene has similar arrangement to the two solid piases P21/a of tetra bromobenzene. Which one of these two forms is actually isomorphic with tetra chlorobenzene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01911913
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  • 9
    Electronic Resource
    Electronic Resource
    A methodology for evaluating a location as a selection site for an international plant breeding program (1989)
    Springer
    Euphytica 43 (1989), S. 165-172 
    Details
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rainfed rice ; Central America ; Mexico ; yield and disease selection ; selection site ; probability of coincidence in selection ; probability of divergence in rejection ; target environments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A method for comparing locations as selection sites based upon their abilities to predict yield and disease reaction over a target region is proposed. The probability of coincidence in selection for a site is defined as the probability for a line selected at the site to be selected at other sites within the region. The probability of divergence in rejection is defined as that associated with regional selection of a line given that is discarded by the site where selection is being conducted. The ideal selection site would maximize the probability of coincidence in selection and minimize the probability of divergence in rejection. The method is illustrated using a set of data from the rice yield nurseries of the International Rice Testing Program for Latin America planted under the rainfed conditions of Central América and México during the period 1978–1984. Five locations were compared for their predictive ability in selecting for the rainfed rice growing region, based on yield and disease reaction. Selection for yield was defined as performance superior to the best check in each location. Selection for disease reaction was based on an index derived from the Standard Evaluation System for Rice for diseases of regional importance. Locations varies 10–15 percent in their selection coincidence with the region for both yield and disease selection criteria applied independently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037909
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  • 10
    Electronic Resource
    Electronic Resource
    Ethanol production from sugarcane bagasse holocellulose. Coupled systems for saccharification, xylose isomerization and yeast fermentation (1988)
    Springer
    World journal of microbiology and biotechnology 4 (1988), S. 383-392 
    Details
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé L'ajout d'une étape d'isomérisation à un système couplé pour la production d'éthanol à partir de bagasse de cane à sucre a permis la fermentation éthanolique tant du xylose que du xylulose parSaccharomyces cerevisiae. Le rendement en g d'éthanol par g de bagasse prétraitée a crû selon la méthode de prétraitement: de 0.185 à 0.24 en cas de prétraitement à la soude caustique, de 0.11 à 0.18 dans le cas de Ca(OH)2 et de 0.26 à 0.29 dans le cas de la méthode combinée Ca(OH)2-NaCl.
    Abstract: Resumen Se estudio la inculsión de una etapa de isomerización en el sistema de columnas acopladas, de producción de etanol a partir del bagazo de caña de azúcar, con el fin de permitir asi la fermentación alcohólica de la xilosa. El rendimiento expresado como g etanol/g bagazo pretratado, aumentó dependiendo del tipo de pretratamiento: 0.185 a 0.24 para el pretratamiento con NaOH; 0.11 a 0.18 para el correspondiente a Ca(OH)2 y 0.26 a 0.29 para un tratamiento combinado de Ca(OH)2-NaCl.
    Notes: Summary Ethanol production from sugarcane bagasse holocellulose. Coupled systems for saccharification, xylose isomerization and yeast fermentation. An isomerization step was added to the coupled system for ethanol production from sugar cane bagasse in order to allow the alcoholic fermentation of xylose as xylulose bySaccharomyces cerevisiae. The yield (g ethanol/g pretreated bagasse) was improved according to the method of pretreatment: 0.185 to 0.24 with NaOH pretreatment, 0.11 to 0.18 for Ca(OH)2 and 0.26 to 0.29 for a combined Ca(OH)2/NaCl method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940162
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