9,514 research outputs found
Non-resonant Collider Signatures of a Singlet-Driven Electroweak Phase Transition
We analyze the collider signatures of the real singlet extension of the
Standard Model in regions consistent with a strong first-order electroweak
phase transition and a singlet-like scalar heavier than the Standard Model-like
Higgs. A definitive correlation exists between the strength of the phase
transition and the trilinear coupling of the Higgs to two singlet-like scalars,
and hence between the phase transition and non-resonant scalar pair production
involving the singlet at colliders. We study the prospects for observing these
processes at the LHC and a future 100 TeV collider, focusing particularly
on double singlet production. We also discuss correlations between the strength
of the electroweak phase transition and other observables at hadron and future
lepton colliders. Searches for non-resonant singlet-like scalar pair production
at 100 TeV would provide a sensitive probe of the electroweak phase transition
in this model, complementing resonant di-Higgs searches and precision
measurements. Our study illustrates a strategy for systematically exploring the
phenomenologically viable parameter space of this model, which we hope will be
useful for future work.Comment: 34 pages + 4 appendices, 13 figures. Comments welcome
An ab initio study of multiple phonon scattering resonances in silicon germanium alloys
We have computed phonon scattering rates and density of states in silicon germanium alloys using Green's function calculations and density functional theory. This method contrasts with the virtual crystal approximation (VCA) used in conjunction with Fermi's golden rule, which cannot capture resonance states occurring through the interaction of substitutional impurities with the host lattice. These resonances are demonstrated by density of states and scattering rate calculations in the dilute limit and show broadening as the concentration increases. Although these deviations become significant from the VCA at high frequencies, the relaxation times obtained for these phonon modes are small in both the full scattering theory and the VCA, resulting in their negligible contribution to thermal transport.United States. Dept. of Energy. Office of Science (Solid-State Solar-Thermal Energy Conversion Center Award DE-SC0001299/DE-FG02-09ER46577
The first successful use of the Levitronix PediMag ventricular support device as a biventricular bridge to transplant in an infant
NumeraciĂłn errĂłnea en el original, se ha corregido
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