Belle II Pixel Detector Commissioning and Operational Experience
March 04, 2020
The Belle II experiment at the Super Flavour Factory SuperKEKB in Tsukuba, Japan, has started regular
operation with its final detector setup in spring 2019. The Belle II vertexing system consists of four layers
of double sided silicon strips (SVD) and two layers of DEPFET pixel sensors (PXD). These inner most pixel layers
are arranged at radii of 14 mm and 22 mm around the beam pipe.
The sensors with pixel sizes down to 50 $\mu$m $\times$ 55 $\mu$m are thinned down to 75 $\mu$m thickness
to minimize multiple scattering. They are most crucial for reconstructing the secondary decay vertices of
short lived B and D mesons with a precision of better than 15 microns. The high luminosity and harsh background
conditions impose challenges on the operation of the detector close to the interaction point.
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