Kavli Affiliate: T. Higuchi
| First 5 Authors: G. Dujany, K. Adamczyk, L. Aggarwal, H. Aihara, T. Aziz
| Summary:
In 2019 the Belle II experiment started data taking at the asymmetric
SuperKEKB collider (KEK, Japan) operating at the Y(4S) resonance. Belle II will
search for new physics beyond the Standard Model by collecting an integrated
luminosity of 50~ab$^{-1}$. The silicon vertex detector (SVD), consisting of
four layers of double-sided silicon strip sensors, is one of the two vertex
sub-detectors. The SVD extrapolates the tracks to the inner pixel detector
(PXD) with enough precision to correctly identify hits in PXD belonging to the
track. In addition the SVD has standalone tracking capability and utilizes
specific ionization to enhance particle identification in the low momentum
region. The SVD is operating reliably and with high efficiency, despite
exposure to the harsh beam background of the highest peak-luminosity collider
ever built. High signal-to-noise ratio and hit efficiency have been measured,
as well as the precise spatial resolution; all these quantities show excellent
stability over time. Data-simulation agreement on cluster properties has
recently been improved through a careful tuning of the simulation. The precise
hit-time resolution can be exploited to reject out-of-time hits induced by beam
background, which will make the SVD more robust against higher levels of
background. During the first three years of running, radiation damage effects
on strip noise, sensor currents and depletion voltage have been observed, as
well as some coupling capacitor failure due to intense radiation bursts. None
of these effects cause significant degradation in the detector performance.
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