Reinstallation and performance of the Belle II Silicon Vertex Detector

Corona, Luigi; Adamczyk, Karol; Aihara, Hiroaki; Bacher, Szymon Grzegorz; Bahinipati, Seema; Baudot, Jerome; Behera, Prafulla Kumar; Bettarini, Stefano; Bilka, Tadeas; Bozek, Andrzej; Buchsteiner, Florian; Casarosa, Giulia; Dujany, Giulio; Finck, Christian; Forti, Francesco; Friedl, Markus; Gabrielli, Alice; Gobbo, Benigno; Halder, Soumen; Hara, Koji; Hazra, Sagar; Higuchi, Takeo; Irmler, Christian; Ishikawa, Akimasa; Kaleta, Mateusz; Kaliyar, Abdul Basith; Kang, Kookhyun; Kohriki, Takashi; Kumar, Rajesh; Lalwani, Kavita; Lautenbach, Klemens; Leboucher, Robin; Libby, James Frederick; Martel, Lucas; Massaccesi, Ludovico; Mohanty, Gagan Bihari; Mondal, Suryanrayan; Nakamura, Katsuro; Natkaniec, Zbigniew Marian; Onuki, Yoshiyuki; Otani, Fumiaki; Paladino, Antonio; Paoloni, Eugenio; Rao, Kameswara Kodali; Ravindran, Krishnakumar; Ripp-baudot, Isabelle; Rizzo, Giuliana; Sato, Yo; Schwanda, Christoph; Serrano, Justine; Shimasaki, Tomoyuki; Suzuki, Junichi; Tanaka, Shuji; Tenchini, Francesco; Thalmeier, Richard; Tiwary, Rahul; Tsuboyama, Toru; Uematsu, Yuma; Vitale, Lorenzo; Wang, Zihan; Wiechczynski, Jaroslaw; Yin, Hao; Zani, Laura; Zeng, Fanli; Das, Sanjeeda Bharati; Null, Null

doi:10.22323/1.476.0855

At the beginning of 2024, the data taking of the Belle II experiment resumed after the long-shutdown 1, required to install a new two-layer DEPFET detector (PXD) and upgrade accelerator components. The whole silicon tracker (VXD) was extracted, the two halves of the outer strip detector (SVD) were split for the PXD insertion and reconnected again. The new VXD was commissioned for the start of the new run. We will describe the challenges of this VXD upgrade and report on the operational experience and the SVD performance obtained with this first-year data. We then introduce the various improvements in the reconstruction procedure, that exploit the excellent SVD hit-time resolution to enhance beam-induced background rejection and reduce track fake-rate, crucial aspects for the higher luminosity regime.

Reinstallation and performance of the Belle II Silicon Vertex Detector / Corona, Luigi; Adamczyk, Karol; Aihara, Hiroaki; Bacher, Szymon Grzegorz; Bahinipati, Seema; Baudot, Jerome; Behera, Prafulla Kumar; Bettarini, Stefano; Bilka, Tadeas; Bozek, Andrzej; Buchsteiner, Florian; Casarosa, Giulia; Dujany, Giulio; Finck, Christian; Forti, Francesco; Friedl, Markus; Gabrielli, Alice; Gobbo, Benigno; Halder, Soumen; Hara, Koji; Hazra, Sagar; Higuchi, Takeo; Irmler, Christian; Ishikawa, Akimasa; Kaleta, Mateusz; Kaliyar, Abdul Basith; Kang, Kookhyun; Kohriki, Takashi; Kumar, Rajesh; Lalwani, Kavita; Lautenbach, Klemens; Leboucher, Robin; Libby, James Frederick; Martel, Lucas; Massaccesi, Ludovico; Mohanty, Gagan Bihari; Mondal, Suryanrayan; Nakamura, Katsuro; Natkaniec, Zbigniew Marian; Onuki, Yoshiyuki; Otani, Fumiaki; Paladino, Antonio; Paoloni, Eugenio; Rao, Kameswara Kodali; Ravindran, Krishnakumar; Ripp-baudot, Isabelle; Rizzo, Giuliana; Sato, Yo; Schwanda, Christoph; Serrano, Justine; Shimasaki, Tomoyuki; Suzuki, Junichi; Tanaka, Shuji; Tenchini, Francesco; Thalmeier, Richard; Tiwary, Rahul; Tsuboyama, Toru; Uematsu, Yuma; Vitale, Lorenzo; Wang, Zihan; Wiechczynski, Jaroslaw; Yin, Hao; Zani, Laura; Zeng, Fanli; Das, Sanjeeda Bharati; Null, Null. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - (2025), pp. 1-6. ( 42nd International Conference on High Energy Physics (ICHEP2024) Prague, Czech Republic 18-24 July 2024) [10.22323/1.476.0855].