PoS - Proceedings of Science
Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T12: Detector R&D and Data Handling
New Results from the Silicon Vertex Detector of the Belle II Experiment
L. Corona*, K. Adamczyk, L. Aggarwal, H. Aihara, T. Aziz, S. Bacher, S. Bahinipati, G. Batignani, J. Baudot, P.K. Behera, S. Bettarini, T. Bilka, A. Bozek, F. Buchsteiner, G. Casarosa, T. Czank, S.B. Das, G. Dujany, C. Finck, F. Forti, M. Friedl, A. Gabrielli, E. Ganiev, B. Gobbo, S. Halder, K. Hara, S. Hazra, T. Higuchi, C. Irmler, A. Ishikawa, H.B. Jeon, Y. Jin, C. Joo, M. Kaleta, A.B. Kaliyar, J. Kandra, K.H. Kang, P. Kapusta, P. Kodyš, T. Kohriki, M. Kumar, R. Kumar, C. La Licata, K. Lalwani, R. Le Boucher, S.C. Lee, J. Libby, L. Massacesi, S.N. Mayekar, G.B. Mohanty, T. Morii, K.R. Nakamura, Z. Natkaniec, Y. Onuki, W. Ostrowicz, A. Paladino, E. Paoloni, H. Park, L. Polat, K.K. Rao, I. Ripp-Baudot, G. Rizzo, D. Sahoo, C. Schwanda, J. Serrano, J. Suzuki, S. Tanaka, H. Tanigawa, R. Thalmeier, R. Tiwari, T. Tsuboyama, Y. Uematsu, O. Verbycka, L. Vitale, K. Wan, Z.M. Wang, J. Webb, J. Wiechczynski, H. Yin and L. Zaniet al. (click to show)
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Abstract
The Silicon Vertex Detector (SVD) consists of four layers of double-sided silicon strip sensors.
The SVD is one of the two vertex subdetectors within Belle II. Since the start of data taking in 2019
at the Super-KEKB collider (KEK, Japan), which has the highest peak-luminosity ever recorded,
the SVD is operated reliably and with high efficiency, despite exposure to harsh beam background.
Measurements using data show that the SVD has both high signal-to-noise ratio and hit efficiency,
as well precise spatial resolution. Further these properties are stable over time. Recently the
simulation has been tuned, using data, to improve the agrement between data and MC for cluster
properties. The good hit-time resolution can be exploited to further improve the robustness against
the higher levels of background expected as the instantaneous luminosity increases in the next
years of running. First effects of radiation damage on strip noise, sensor currents and depletion
voltage have been measured, although they do not have any detrimental effect on the performance
of the detector.
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