We report new constraints on the spin-dependent (SD) WIMP-proton cross section using the COSINE-100 experiment at the Yangyang Underground Laboratory. This analysis achieves a pioneering detection threshold of 3 and 4 pulse clusters corresponding to the measured photoelectrons. This allows us to access the unstudied few-photoelectron regime, significantly below the previous 8-photoelectron...
The search for neutrinoless double electron capture (0ν2EC) is a powerful probe for lepton-number violation and the Majorana nature of neutrinos. We report on a search for the 0ν2EC decay of 40Ca using the AMoRE-I cryogenic detector array, which utilizes metallic magnetic calorimeters (MMCs) and 48depl.Ca100MoO4 crystals. Analyzing a total...
Dark matter (DM) can be gravitationally captured around a massive compact object, forming a dense halo. If primordial black holes (PBHs) exist, surrounding dark matter particles can be accreted through gravitational attraction, leading to the formation of a DM halo with a steep spike profile near the PBH.
If the dark matter consists of axions or axion-like particles (ALPs), the high number...
In 2023, Belle II collaboration announced the observarion of the B→K+νν decay channel for the first time. This decay channel provides a clean signal with high precision in theoretical calculation. However, we encounter 2.8σ deviation from the Standard Model prediction. To resolve this excess, we study scalar dark matter model with local discrete Z 3 Z 3 symmetry. Considering dark Higgs mass...
