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  • 1
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    Self-coupling of the Higgs boson in the processes pp→ZHHH+X and pp→WHHH+X (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-06-08
    Description: Author(s): Duane A. Dicus, Chung Kao, and Wayne W. Repko To gain some sense about the likelihood of measuring the Higgs boson quartic coupling, we calculate the contribution to the triple Higgs production cross section from the subprocesses q q ¯ → Z H H H and q q ¯ ′ → W H H H . Our results illustrate that determining this coupling, or even providing experimental eviden… [Phys. Rev. D 93, 113003] Published Mon Jun 06, 2016
    Keywords: Electroweak Interactions
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Comparison of H→ℓℓ¯γ and H→γZ,Z→ℓℓ¯ including the ATLAS cuts (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-02-26
    Description: Author(s): Duane A. Dicus, Chung Kao, and Wayne W. Repko A precise comparison is made between the Dalitz decay H→ℓℓ¯γ and the two-body decay H→γZ, Z→ℓℓ¯ for electrons and for muons including experimental cuts appropriate for the ATLAS detector. The widths for these two processes differ by 8% for electrons and 3% for muons. Given that there remain uncertai... [Phys. Rev. D 89, 033013] Published Tue Feb 25, 2014
    Keywords: Electroweak Interactions
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Dalitz decay H→ff¯γ as a background for H→γγ (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-05-14
    Description: Author(s): Duane A. Dicus and Wayne W. Repko The Dalitz decay H→ff¯γ is calculated for very small ff¯ invariant masses where the ff¯ pair could be mistaken for a photon in the analysis of H→γγ decays. Using the ATLAS cuts and the full Dalitz decay amplitude, we estimate this fraction to be 7.06%. [Phys. Rev. D 89, 093013] Published Tue May 13, 2014
    Keywords: Electroweak Interactions
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Interference effects and the use of Higgs boson pair production to study the Higgs trilinear self-coupling (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-11-06
    Description: Author(s): Duane A. Dicus, Chung Kao, and Wayne W. Repko We show that the dominant channel proposed for the determination of the Higgs boson trilinear coupling, p p → H H + X via gluon fusion, exhibits an interference structure that is independent of the collider energy for collider energies in the range 8     TeV ≤ s ≤ 100     TeV and is almost maximally destructive. Th… [Phys. Rev. D 92, 093003] Published Wed Nov 04, 2015
    Keywords: Electroweak Interactions
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Bounds on dark matter in solar orbit (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The possibility is considered that a spherical distribution of dark matter (DM), matter not visible with current instruments, is trapped in the sun's gravitational field. Bounds are placed from the motion of Uranus and Neptune, on the amount of DM that could be so trapped within the radius of those planets' orbits, as follows: from the Voyager 2, Uranus-flyby data new, more accurate ephemeris values are generated. Trapped DM mass is bounded by noting that such a distribution would increase the effective mass of the sun as seen by the outer planets and by using the new ephemeris values to bound such an increase.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 342; 539-544
    Format: text
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  • 6
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    X-ray spectral signatures of photoionized plasmas (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Plasma emission codes have become a standard tool for the analysis of spectroscopic data from cosmic X-ray sources. However, the assumption of collisional equilibrium, typically invoked in these codes, renders them inapplicable to many important astrophysical situations, particularly those involving X-ray photoionized nebulae. This point is illustrated by comparing model spectra which have been calculated under conditions appropriate to both coronal plasmas and X-ray photoionized plasmas. It is shown that the (3s-2p)/(3d-2p) line ratios in the Fe L-shell spectrum can be used to effectively discriminate between these two cases. This diagnostic will be especially useful for data analysis associated with AXAF and XMM, which will carry spectroscopic instrumentation with sufficient sensitivity and resolution to identify X-ray photoionized nebulae in a wide range of astrophysical environments.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 350; L37-L40
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  • 7
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    X-ray emission-line spectra of photoionized plasmas - Density sensitivity of the Fe L-shell series (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The circumsource environments of accretion-powered X-ray sources are likely to support relatively dense (greater than 10 exp 11/cu cm) photoionized X-ray emission-line regions. The Fe L-shell ions provide a versatile class of plasma diagnostics in this regime, their multielectron structures resulting in diverse spectral phenomena. Attention is given to the spectral response of Fe L-shell ions to variations in electron density over the range 10 exp 11 to 10 exp 16/cu cm. It is found that density-sensitive line ratios exist in the wavelength interval 12-17 A for the ions Fe XVII-XXI. The prominent role of radiative recombination in the population kinetics distinguishes the density-sensitive Fe lines in photoionized plasmas from those which operate in coronal equilibrium plasmas. The results of detailed atomic modeling of these ions are presented and applications to spectroscopic observations of accretion-driven X-ray sources are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 391; 1 Ma; 306-317
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