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

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.

doi:10.1016/j.nima.2024.169652

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.

Operational experience and performance of the Belle II silicon vertex detector after the first SuperKEKB long shutdown / 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.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - 1067:(2024), pp. 1-2. ( 16th Pisa Meeting on Advanced Detectors La Biodola - Isola d'Elba (Italy) May 26, 2024 to June 1, 2024) [10.1016/j.nima.2024.169652].