000004430 001__ 4430
000004430 005__ 20240711150618.0
000004430 037__ $$aBELLE2-TALK-CONF-2024-089
000004430 041__ $$aeng
000004430 088__ $$aBELLE2-TALK-DRAFT-2024-100
000004430 100__ $$aDoris Yangsoo Kim
000004430 245__ $$aSearches for Dark Sector Particles at Belle and Belle II
000004430 260__ $$aIDM 2024$$c2024-07-11
000004430 300__ $$amult. p
000004430 500__ $$a16 min + 4 min Q & A
000004430 520__ $$aThe Belle and Belle II experiment have collected samples of e+ e- collision data at centre-of-mass energies near the Upsilon(nS) resonances. These data have constrained kinematics and low multiplicity, which allow searches for dark sector particles in the mass range from a few MeV to 10 GeV. Using a 426/fb sample collected by Belle II, we search for a light dark photon that could explain the ATOMKI anomaly and a Z' boson that decays invisibly. Using a 711/fb sample collected by Belle, we search for B to h + invisible decays, where h is a pi, K, D, D_s, or p, and B to K a, where a is an axion-like particle.
000004430 6531_ $$adark sector
000004430 6531_ $$aBelle
000004430 6531_ $$aBelle II
000004430 8560_ $$fdorisykim@soongsil.ac.kr
000004430 8564_ $$uhttps://docs.belle2.org/record/4430/files/BELLE2-TALK-CONF-2024-089.pdf