Operational experience and performance of the Belle II silicon vertex detector after the first SuperKEKB long shutdown

The Belle II experiment searches for beyond-the-standard-model physics using the Belle II detector and SuperKEKB collider. The silicon vertex detector (SVD) is crucial for particle tracking. After the 1.5-year shutdown from June 2022, Run 2 began in January 2024; Run 2 operation shows stable noise l...

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Veröffentlicht in:Nucl.Instrum.Meth.A 2024-10, Vol.1067, p.169652, Article 169652
Hauptverfasser: Otani, F., Adamczyk, K., Aihara, H., Bacher, S., Bahinipati, S., Baudot, J., Behera, P.K., Bettarini, S., Bilka, T., Bozek, A., Buchsteiner, F., Casarosa, G., Corona, L., Das, S.B., Dujany, G., Finck, C., Forti, F., Friedl, M., Gabrielli, A., Gobbo, B., Halder, S., Hara, K., Hazra, S., Higuchi, T., Irmler, C., Ishikawa, A., Kaleta, M., Kaliyar, A.B., Kang, K.H., Kohriki, T., Kumar, R., Lalwani, K., Lautenbach, K., Leboucher, R., Libby, J., Martel, L., Massaccesi, L., Mohanty, G.B., Mondal, S., Nakamura, K.R., Natkaniec, Z., Onuki, Y., Paladino, A., Paoloni, E., Rao, K.K., Ravindran, K., Ripp-Baudot, I., Rizzo, G., Sato, Y., Schwanda, C., Serrano, J., Shimasaki, T., Suzuki, J., Tanaka, S., Tenchini, F., Thalmeier, R., Tiwary, R., Tsuboyama, T., Uematsu, Y., Vitale, L., Wang, Z., Wiechczynski, J., Yin, H., Zani, L., Zeng, F.
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Sprache:eng
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Zusammenfassung:The Belle II experiment searches for beyond-the-standard-model physics using the Belle II detector and SuperKEKB collider. The silicon vertex detector (SVD) is crucial for particle tracking. After the 1.5-year shutdown from June 2022, Run 2 began in January 2024; Run 2 operation shows stable noise levels, high signal-to-noise ratios, and hit efficiency over 99%. To manage higher beam background from increased luminosity, new techniques such as hit-time selection and cluster grouping are being developed. These methods increase the acceptable level of occupancy by distinguishing hits from triggered collisions and other sources.
ISSN:0168-9002
DOI:10.1016/j.nima.2024.169652