First Look at the Time-Dependent $CP$ Violation Using Early Belle II Data

Sumitted to PubDB: 2020-01-27

Category: Proceeding, Visibility: Public

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Authors	Vladimir Chekelian
Date	Jan. 27, 2020
Belle II Number	BELLE2-CONF-PROC-2020-002
Abstract	The Belle~II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider started the first physics run in March 2019 at a center of mass energy corresponding to the mass of the $\Upsilon(4S)$. A first look at the time-dependent $CP$ violation is presented, utilising an early data set comprising 2.6 fb$^{-1}$ of total luminosity. A new concept of time-dependent fits based on a weighting technique applied to an {\it assistive} MC sample of events is presented as well.