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Constraints for Rare Electron-Capture Decays Mimicking Detection of Dark-Matter Particles in Nuclear Transitions.
Phys Rev Lett
December 2024
Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea.
We give for the first time theoretical estimates of unknown rare electron-capture (EC) decay branchings of ^{44}Ti, ^{57}Co, and ^{139}Ce, relevant for searches of (exotic) dark-matter particles. The nuclear-structure calculations have been done exploiting the nuclear shell model with well-established Hamiltonians and an advanced theory of β decay. In the absence of experimental measurements of these rare branches, these estimates are of utmost importance for terrestrial searches of dark-matter particles, such as axionic dark matter in the form of axionlike particles, anapole dark matter, and dark photons in nuclear transitions.
View Article and Find Full Text PDFNew Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector.
Phys Rev Lett
November 2024
Physics Department, University of Patras, Patras, Greece.
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching for solar axions via their back conversion to x-ray photons in a 9-T 10-m long magnet directed toward the Sun. We report on an extended run with the International Axion Observatory pathfinder detector, doubling the previous exposure time.
View Article and Find Full Text PDFSupernova Axions Convert to Gamma Rays in Magnetic Fields of Progenitor Stars.
Phys Rev Lett
November 2024
Berkeley Center for Theoretical Physics, University of California, Berkeley, California 94720, USA and Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
It has long been established that axions could have been produced within the nascent proto-neutron star formed following the type II supernova SN1987A, escaped the star due to their weak interactions, and then converted to gamma rays in the Galactic magnetic fields; the nonobservation of a gamma-ray flash coincident with the neutrino burst leads to strong constraints on the axion-photon coupling for axion masses m_{a}≲10^{-10} eV. In this Letter, we use SN1987A to constrain higher mass axions, all the way to m_{a}∼10^{-3} eV, by accounting for axion production from the Primakoff process, nucleon bremsstrahlung, and pion conversion along with axion-photon conversion on the still-intact magnetic fields of the progenitor star. Moreover, we show that gamma-ray observations of the next Galactic supernova, leveraging the magnetic fields of the progenitor star, could detect quantum chromodynamics axions for masses above roughly 50 μeV, depending on the supernova.
View Article and Find Full Text PDFSearch for Dark Matter Axions with Tunable TM_{020} Mode.
Phys Rev Lett
November 2024
Department of Physics, KAIST, Daejeon 34141, Republic of Korea.
Article Synopsis
- As the search frequency for axions increases, detection efficiency drops due to reduced cavity volume, although higher-order resonant modes could help maintain volume.
- A new tuning method using auxetic materials was introduced to improve detection, successfully applied to a specific mode, leading to new limits on axion-photon coupling strength in a targeted mass range.
Phenomenology of photons-enriched semi-visible jets.
Eur Phys J C Part Fields
November 2024
ETH Zürich, Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland.
Article Synopsis
- This letter proposes a new method for identifying confining dark sectors at the LHC through the detection of semi-visible jets resulting from collisions involving dark quarks from a hidden sector.
- It explains how these semi-visible jets can produce non-isolated photons and stable/unstable dark bound states, which may not align with current search strategies at the LHC.
- The authors suggest using a deep neural network to differentiate these exotic jets from background noise by analyzing their unique substructure, allowing for potential discoveries of heavy bosons with masses up to 5 TeV using data from the LHC's Run 2.
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