Particle Physics
Enhanced Precision in CKM Angle Gamma Measurement Through a Joint LHCb-BESIII Analysis
This research presents a novel, unbinned, model-independent approach to precisely measure the CKM angle gamma. By jointly analyzing data from LHCb and BESIII experiments, the study combines charge-parity violating observables from B-meson decays with strong-phase parameters from D-meson decays. This…
TM020 Cavity Mode Achieves 1.7x KSVZ Axion Sensitivity at 21 μeV
Researchers utilized the TM020 mode in a cylindrical cavity haloscope with an innovative tuning mechanism to search for axion dark matter at masses around 21 μeV, extending beyond the conventional <10 μeV range. This approach delivered sensitivity 1.7 times better than the KSVZ benchmark across a…
CAPP Sets Record Exclusion Limits on Axion-Photon Coupling Above 1 GHz with Optimized Haloscope
CAPP's Main Axion eXperiment conducted a high-sensitivity search for axion dark matter in the 1.025–1.185 GHz (4.24–4.91 μeV) range using a 37-liter copper cavity in a 12 T Nb3Sn/NbTi magnet. Innovations include a dilution refrigerator achieving <40 mK core temperature and quantum-limited readout…
Multi-Cell Cavity Haloscope Excludes KSVZ Axions in 21.86-22.00 μeV Mass Range
Theoretical models from multiple groups converge on dark matter axion masses between 20-30 μeV. A multi-cell cavity haloscope in a 12 T magnetic field searched for axion-induced microwave signals in the 21.86-22.00 μeV range. The experiment ruled out KSVZ axions as dark matter at 90% confidence leve…
CAPP Achieves Record-Low 200 mK Noise and 10x Better Sensitivity in 9.5 μeV Axion Search
CAPP's axion dark matter experiment reached a system noise temperature of 200 mK using a flux-driven Josephson parametric amplifier in phase-insensitive mode, the lowest among published cavity haloscope searches. A two-stage scanning method increased scan speed by 26%. This enabled exclusion of QCD …