Sumitted to PubDB: 2018-07-23

Category: Proceeding, Visibility: Public

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Authors	Giacomo De Pietro
Date	2018-07-21
Belle II Number	BELLE2-CONF-PROC-2018-012
Abstract	Belle II is a major upgrade of the Belle experiment that operates at the $B$-factory SuperKEKB in Japan. Since SuperKEKB has a design luminosity of 8$\times$10${}^{35}$ cm${}^{-2}$s${}^{-1}$, about 40 times larger that of KEKB, Belle II aims to collect $50$ ab${}^{-1}$ of data over a period of 8 years. The first data taking runs for physics analyses have started in April 2018, with a lower luminosity than the designed one for commissioning purposes. Even with the early dataset (having an integrated luminosity up to 20 fb${}^{-1}$), Belle II can improve the searches for Dark Sector candidates. In this paper we will present the expected sensitivity of Belle II for invisibly decaying Dark Photons, for Axion-Like Particles and for invisibly decaying $Z^{\prime }$ assuming a $L_{\mu }-L_{\tau }$ model.

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