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ICHEP 2020

July 28, 2020 to August 6, 2020
virtual conference
Europe/Prague timezone

Performance and background expectations of the Belle II pixel vertex detector at SuperKEKB

Jul 30, 2020, 11:55 AM
15m
virtual conference

virtual conference

Talk 12. Operation, Performance and Upgrade of Present Detectors

Speaker

Slavomira Stefkova (DESY)

Description

The Belle II experiment aims to collect 50 ab$^{-1}$ of e$^{+}$e$^{-}$ collision data at the SuperKEKB collider in Japan. The first collisions with the full Belle II detector were recorded in Spring 2019. Excellent performance of the innermost pixel vertex detector (PXD) is crucial for many high profile B-decay measurements, namely those which rely heavily on precise knowledge of decay vertices. Therefore, PXD performance parameters, such as the intrinsic resolution and hit efficiency, are being monitored continuously throughout data taking. As SuperKEKB approaches its design luminosity, Belle II will have to cope with significantly higher backgrounds. Understanding the composition and spatial dependence of the different background sources provides indispensable information for possible background mitigation. The comparison of dedicated measurements with the corresponding simulations allows for projecting background levels to design luminosity, which tests the PXD readiness for the runs to come.