11 research outputs found
First Search for Axion-Like Particles in a Storage Ring Using a Polarized Deuteron Beam
Based on the notion that the local dark-matter field of axions or axion-like
particles (ALPs) in our Galaxy induces oscillating couplings to the spins of
nucleons and nuclei (via the electric dipole moment of the latter and/or the
paramagnetic axion-wind effect), we performed the first experiment to search
for ALPs using a storage ring. For that purpose, we used an in-plane polarized
deuteron beam stored at the Cooler Synchrotron COSY, scanning momenta near 970
MeV/c. This entailed a scan of the spin precession frequency. At resonance
between the spin precession frequency of deuterons and the ALP-induced EDM
oscillation frequency there will be an accumulation of the polarization
component out of the ring plane. Since the axion frequency is unknown, the
momentum of the beam and consequently the spin precession frequency were ramped
to search for a vertical polarization change that would occur when the
resonance is crossed. At COSY, four beam bunches with different polarization
directions were used to make sure that no resonance was missed because of the
unknown relative phase between the polarization precession and the axion/ALP
field. A frequency window of 1.5-kHz width around the spin precession frequency
of 121 kHz was scanned. We describe the experimental procedure and a test of
the methodology with the help of a radiofrequency Wien filter located on the
COSY ring. No ALP resonance was observed. As a consequence an upper limit of
the oscillating EDM component of the deuteron as well as its axion coupling
constants are provided.Comment: 25 pages, 24 figures, 7 tables, 67 reference
Electric dipole moments and the search for new physics
Static electric dipole moments of nondegenerate systems probe mass scales for
physics beyond the Standard Model well beyond those reached directly at high
energy colliders. Discrimination between different physics models, however,
requires complementary searches in atomic-molecular-and-optical, nuclear and
particle physics. In this report, we discuss the current status and prospects
in the near future for a compelling suite of such experiments, along with
developments needed in the encompassing theoretical framework.Comment: Contribution to Snowmass 2021; updated with community edits and
endorsement
An implementation of spin-dependent hadron elastic scattering in GEANT4
© 2022, The Korean Physical Society.An implementation of the spin-dependent differential cross-section is discussed for the elastic hadron–nucleus scattering process in the GEANT4. To validate our implementation, real measurement results of proton-carbon cross-section are compared and the results are discussed. This implementation is applied to study a proposed experiment on the proton electric dipole moment in particular the systematic effects of the experiment.11Nsciescopuskc
Evaluation of Anti-Colitic Effect of Chung-Jang-Hwan (C-mix) in Mice
The inhibitory effect of Chung-Jang-Hwan (C-mix) consisted of Geranium nepalense subsp. thunbergii, Saururus chinensis, and Rubus coreanus were investigated in dextran sulfate sodium (DSS)-induced colitic mice by microarray analysis. Treatment with C-mix improved colitic symptoms, including colon shortening and myeloperoxidase activity. Treatment with DSS alone upregulated the expression levels of inflammation-related genes, including IL-1 beta, IL-6, CCL2, CCL4, CCL5, CCL7, CCL8, CCL24, CXCL1, CXCL2, CXCL5, CXCL9 and CXCL10, and other colitis-related genes such as COX-2, PAP, MMP family, S100a8, S100a9 and DEFA1 in mice. However, treatment with C-mix inhibited the expression levels of inflammation-associated genes induced by DSS. The increased expression levels of COX-2 and IL-1 beta, representative inflammatory genes, were confirmed by a quantitative real-time polymerase chain reaction analysis. These results indicate that C-mix may ameliorate colitis by the inhibitory regulation of inflammation-associated genes
First Results from Axion Haloscope at CAPP around 10.7 eV
The Center for Axion and Precision Physics research at the Institute for Basic Science is searching for axion dark matter using ultra-low temperature microwave resonators. We report the exclusion of the axion mass range 10.712610.7186 eV with near Kim-Shifman-Vainshtein-Zakharov (KSVZ) coupling sensitivity and the range 10.1611.37 eV with about 9 times larger coupling at 90 confidence level. This is the first axion search result in these ranges. It is also the first with a resonator physical temperature of less than 40 mK