Searches for Dark Sector Particles at Belle and Belle II

Sumitted to PubDB: 2024-07-11

Category: Talk, Visibility: Public

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Authors	Doris Kim
Date	July 11, 2024
Belle II Number	BELLE2-TALK-CONF-2024-089
Abstract	The 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.
Conference	IDM 2024