74,679 research outputs found
Comment on "Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn"
Recently, Rourke et al. reported point-contact spectroscopy results on the
heavy-fermion superconductor CeCoIn [1]. They obtained conductance spectra
on the c-axis surfaces of CeCoIn single crystals. Their major claims are
two-fold: CeCoIn has i) d-wave pairing symmetry and ii) two coexisting
order parameter components. In this Comment, we show that these claims are not
warranted by the data presented. [1] Rourke et al., Phys. Rev. Lett. 94, 107005
(2005).Comment: accepted for publication in Phys. Rev. Lett., final for
Beyond the Dark matter effective field theory and a simplified model approach at colliders
Direct detection of and LHC search for the singlet fermion dark matter (SFDM)
model with Higgs portal interaction are considered in a renormalizable model
where the full Standard Model (SM) gauge symmetry is imposed by introducing a
singlet scalar messenger. In this model, direct detection is described by an
effective operator m_q \bar{q} q \bar{\chi} \chi as usual, but the full
amplitude for monojet + \not E_T involves two intermediate scalar propagators,
which cannot be seen within the effective field theory (EFT) or in the
simplified model without the full SM gauge symmetry. We derive the collider
bounds from the ATLAS monojet + \not E_T as well as the CMS t\bar{t} + \not E_T
data, finding out that the bounds and the interpretation of the results are
completely different from those obtained within the EFT or simplified models.
It is pointed out that it is important to respect unitarity, renormalizability
and local gauge invariance of the SM.Comment: 7 pages, 3 figures, version published in Phys. Lett.
What are the New and Emerging Areas of HR and Talent Management Practices to Enhance the Productivity and the Business Outcome?
Question: What are the new and emerging areas of HR and talent management practices that we need to start paying attention to in order to enhance the productivity and the business outcome
Van der Waals density-functional theory study for bulk solids with BCC, FCC, and diamond structures
Proper inclusion of van der Waals (vdW) interactions in theoretical
simulations based on standard density functional theory (DFT) is crucial to
describe the physics and chemistry of systems such as organic and layered
materials. Many encouraging approaches have been proposed to combine vdW
interactions with standard approximate DFT calculations. Despite many vdW
studies, there is no consensus on the reliability of vdW methods. To help
further development of vdW methods, we have assessed various vdW functionals
through the calculation of structural prop- erties at equilibrium, such as
lattice constants, bulk moduli, and cohesive energies, for bulk solids,
including alkali, alkali-earth, and transition metals, with BCC, FCC, and
diamond structures as the ground state structure. These results provide
important information for the vdW-related materials research, which is
essential for designing and optimizing materials systems for desired physical
and chemical properties.Comment: 10 pages, 6 Figures, 3 Table
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