4,527 research outputs found
Associated Production of Fermionic Dark Matter and Neutrino at the Future Lepton Colliders
In light of the fermionic dark matter absorption on electron target that can
be observed by direct detection experiments, we study its complementary
searches at the future colliders such as CEPC, FCC-ee, ILC, and CLIC.
Two typical processes, the mono-photon and electron-positron pair production
associated with missing energy, can serve the purpose. While the mono-photon
search prevails at CEPC, FCC-ee, and ILC, the channel
has more significant contributions at CLIC with much higher collision energy
. The beam polarizations can help further suppressing the SM
backgrounds to enhance the signal significance while differential cross
sections can distinguish the Lorentz structure of various effective operators.
The combined sensitivity can reach well above 1 TeV at CEPC/FCC-ee and ILC
while it further touches 30 TeV at CLIC. Comparing with the updated results
from the dark matter direct detection experiments (XENON1T, PandaX-II,
PandaX-4T, LZ, and XENONnT), astrophysical observations, and
cosmological constraints, the collider searches can not just provide better
sensitivity for light dark matter mass but also scan much wider mass range.Comment: 34pages, 17 captioned figure
Interlayer Coupling of Co/NM/FM(NiFe and Co) Nano-Sandwich Films
AbstractCu/Co, Cu/NiFe, Ta/NiFe bilayers and Co/Cu/Co, Co/Cu/NiFe, Co/Ta/NiFe sandwich films were deposited by a magnetron sputtering method. Magnetic properties were evaluated by VSM and spin valve magnet oresistance was investigated by a four-probe method to study the interlayer coupling of the two magnetic layers. It has been found that the interlayer coupling depended not only on the layer thickness of the nonmagnetic spacer but also on the nature of the spacer. The interlayer coupling was reduced as the spacer layer thickness increased. The result was consistent with those from observations of the magnetic domain for the trilayers by means of Lorentz Electron Microscope. The trilayers with Cu spacer layer have shown a stronger coupling than those with Ta spacer layer
The roles of SMYD4 in epigenetic regulation of cardiac development in zebrafish
SMYD4 belongs to a family of lysine methyltransferases. We analyzed the role of smyd4 in zebrafish development by generating a smyd4 mutant zebrafish line (smyd4L544Efs*1) using the CRISPR/Cas9 technology. The maternal and zygotic smyd4L544Efs*1 mutants demonstrated severe cardiac malformations, including defects in left-right patterning and looping and hypoplastic ventricles, suggesting that smyd4 was critical for heart development. Importantly, we identified two rare SMYD4 genetic variants in a 208-patient cohort with congenital heart defects. Both biochemical and functional analyses indicated that SMYD4(G345D) was pathogenic. Our data suggested that smyd4 functions as a histone methyltransferase and, by interacting with HDAC1, also serves as a potential modulator for histone acetylation. Transcriptome and bioinformatics analyses of smyd4L544Efs*1 and wild-type developing hearts suggested that smyd4 is a key epigenetic regulator involved in regulating endoplasmic reticulum-mediated protein processing and several important metabolic pathways in developing zebrafish hearts
Topological surface electronic states in candidate nodal-line semimetal CaAgAs
We investigate systematically the bulk and surface electronic structure of
the candidate nodal-line semimetal CaAgAs by angle resolved photoemission
spectroscopy and density functional calculations. We observed a metallic,
linear, non--dispersive surface band that coincides with the
high-binding-energy part of the theoretical topological surface state, proving
the topological nontriviality of the system. An overall downshift of the
experimental Fermi level points to a rigid-band-like -doping of the samples,
due possibly to Ag vacancies in the as-grown crystals.Comment: 6 pages, 5 figure
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