491 research outputs found
Measurement of electroweak WZ boson production and search for new physics in WZ plus two jets events in pp collisions at root s=13 TeV
No full textA measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZ -> l nu l'l', where l, l' = e, mu. The analysis is based on a data sample of proton-proton collisions at root s = 13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb(-1) . The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented. (C) 2019 The Author(s). Published by Elsevier B.V
Measurement of electroweak WZ boson production and search for new physics in WZ + two jets events in pp collisions at s=13TeV
No full textA measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZ→ℓνℓ′ℓ′, where ℓ,ℓ′=e,μ. The analysis is based on a data sample of proton-proton collisions at s=13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb−1. The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented. © 2019 The Author(s
Measurement of electroweak WZ boson production and search for new physics in WZ plus two jets events in pp collisions at root s=13 TeV
Full text linkA measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZ -> l nu l'l', where l, l' = e, mu. The analysis is based on a data sample of proton-proton collisions at root s = 13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb(-1) . The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented. (C) 2019 The Author(s). Published by Elsevier B.V
Measurement of electroweak WZ boson production and search for new physics in WZ plus two jets events in pp collisions at root s=13 TeV
Full text linkA measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZ -> l nu l'l', where l, l' = e, mu. The analysis is based on a data sample of proton-proton collisions at root s = 13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb(-1) . The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented. (C) 2019 The Author(s). Published by Elsevier B.V.Peer reviewe
Measurement of the WZ production cross section in pp collisions at s=13 TeV
No full textThe WZ production cross section in proton–proton collisions at s=13 TeV is measured with the CMS experiment at the LHC using a data sample corresponding to an integrated luminosity of 2.3 fb−1. The measurement is performed in the leptonic decay modes WZ→ℓνℓ′ℓ′, where ℓ,ℓ′=e,μ. The measured cross section for the range 60<mℓ′ℓ′<120 GeV is σ(pp→WZ)=39.9±3.2(stat) (syst)−3.1+2.9±0.4(theo)±1.3(lumi) pb, consistent with the standard model prediction. © 2017 The Author(s
Period changes of two contact binaries: DF Hya and WZ And
Full text link33rd International Physics Congress of the Turkish-Physical-Society (TPS) -- SEP 06-10, 2017 -- Bodrum, TURKEYOrbital period variations of two contact binaries DF Hya and WZ And are analyzed with the least-squares method by using all available minima times. It is shown that the period variations of these systems are due mainly to the LightTime Effect (LITE) due originates from gravitational influence of a third body. New LITE elements such as, orbital periods and minimum masses of possibility third bodies are given.Turkish Phys So
Observation of WZ production
Full text linkWe report the first observation of the associated production of a W boson and a Z boson. This result is based on 1.1 fb(-1) of integrated luminosity from p (p) over bar collisions at root s=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. We observe 16 WZ candidates passing our event selection with an expected background of 2.7 +/- 0.4 events. A fit to the missing transverse energy distribution indicates an excess of events compared to the background expectation corresponding to a significance equivalent to 6 standard deviations. The measured cross section is sigma(p (p) over bar -> WZ)=5.0(-1.6)(+1.8) pb, consistent with the standard model expectation
Defect-Induced Nucleation and Epitaxy: A New Strategy toward the Rational Synthesis of WZ-GaN/3C-SiC Core–Shell Heterostructures
No full textIn this work, we demonstrate
a new strategy to create WZ-GaN/3C-SiC heterostructure nanowires,
which feature controllable morphologies. The latter is realized by
exploiting the stacking faults in 3C-SiC as preferential nucleation
sites for the growth of WZ-GaN. Initially, cubic SiC nanowires with
an average diameter of ∼100 nm, which display periodic stacking
fault sections, are synthesized in a chemical vapor deposition (CVD)
process to serve as the core of the heterostructure. Subsequently,
hexagonal wurtzite-type GaN shells with different shapes are grown
on the surface of 3C-SiC wire core. In this context, it is possible
to obtain two types of WZ-GaN/3C-SiC heterostructure nanowires by
means of carefully controlling the corresponding CVD reactions. Here,
the stacking faults, initially formed in 3C-SiC nanowires, play a
key role in guiding the epitaxial growth of WZ-GaN as they represent
surface areas of the 3C-SiC nanowires that feature a higher surface
energy. A dedicated structural analysis of the interfacial region
by means of high-resolution transmission electron microscopy (HRTEM)
revealed that the disordering of the atom arrangements in the SiC
defect area promotes a lattice-matching
with respect to the WZ-GaN phase, which results in a preferential
nucleation. All WZ-GaN crystal domains exhibit an epitaxial growth
on 3C-SiC featuring a crystallographic relationship of [12̅10]<sub>WZ‑GaN</sub> //[011̅]<sub>3C‑SiC</sub>, (0001)<sub>WZ‑GaN</sub>//(111)<sub>3C‑SiC</sub>, and d<sub>WZ‑GaN(0001)</sub> ≈ 2d<sub>3C‑SiC(111)</sub>. The approach to utilize
structural defects of a nanowire core to induce a preferential nucleation
of foreign shells generally opens up a number of opportunities for
the epitaxial growth of a wide range of semiconductor nanostructures
which are otherwise impossible to acquire. Consequently, this concept
possesses tremendous potential for the applications of semiconductor
heterostructures in various fields such as optics, electrics, electronics,
and photocatalysis for energy harvesting and environment processing
Measurement of electroweak WZ boson production and search for new physics in WZ+ two jets events in pp collisions at √s=13TeV
Full text linkA measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZ→lνl′l′, where l,l′=e,μ. The analysis is based on a data sample of proton-proton collisions at s=13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb−1. The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented
Orbital period changes in WZ Sagittae
Full text link“This is an author-created, un-copyedited version of an article accepted for publication in Publications of the Astronomical Society of the Pacific. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at [10.1088/1538-3873/aaa7e7].We report a long-term (1961-2017) study of the eclipse times in the dwarf novae WZ Sagittae, in an effort to learn its rate of orbital-period change. Some wiggles with a timescale of 20-50 years are apparent, and a connection with the ~23 year interval between dwarf-nova eruptions is possible. These back-and-forth wiggles dominate the O-C diagram, and prevent a secure measurement of the steady rate of orbital-period change.National Science Foundation (NSF) grants AST12-11129 y AST16-15456Ciencias Integrada
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