Performance Studies of the Belle II Silicon Vertex Detector

Lalwani, Kavita; Aihara, H.; Aziz, T.; Bacher, S.; Bahinipati, S.; Barberio, E.; Baroncelli, Ti.; Baroncelli, To.; Basith, A. K.; Batignani, G.; Bauer, A.; Behera, P. K.; Bertacchi, V.; Bettarini, S.; Bhuyan, B.; Bilka, T.; Bosi, F.; Bosisio, L.; Bozek, A.; Buchsteiner, F.; Caria, G.; Casarosa, Giulia; Ceccanti, M.; Červenkov, D.; Czank, T.; Dash, N.; Nuccio, M. De; Doležal, Z.; Forti, F.; Friedl, M.; Gobbo, B.; A., J.; Grimaldo, M.; Hara, K.; Higuchi, T.; Irmler, C.; Ishikawa, A.; Jeon, H. B.; Joo, C.; Kaleta, M.; Kandra, Jakub; Kang, K. H.; Kodyš, P.; Kohriki, T.; Komarov, I.; Kumar, M.; Kumar, R.; Kvasnička, P.; Licata, C.; Lanceri, L.; Lee, J.; Lee, S. C.; Li, Y.; Libby, J.; Lueck, T.; Mammini, P.; Martini, A.; Mayekar, S. N.; Mohanty, G. B.; Morii, T.; Nakamura, K. R.; Natkaniec, Z.; Onuki, Y.; Ostrowicz, W.; Paladino, A.; Paoloni, E.; Park, H.; Prasanth, K.; Profeti, A.; Rao, K. K.; Rashevskaya, I.; Resmi, P. K.; Rizzo, G.; Rozanska, M.; Sahoo, D.; Sasaki, J.; Sato, N.; Schultschik, S.; Schwanda, C.; Stypula, J.; Suzuki, J.; Tanaka, S.; Tanigawa, H.; Taylor, G. N.; Thalmeier, R.; Tsuboyama, T.; Urquijo, P.; Vitale, L.; Wan, K.; Watanabe, M.; Watanuki, S.; Watson, I. J.; Webb, J.; Wiechczynski, J.; Williams, S.; Yin, H.; Zani, Laura; On behalf of the BELLE II SVD collaboration,

doi:10.22323/1.348.0052

Abstract

The Belle II experiment at the SuperKEKB asymmetric-energy $e ^{+} e^{−}$ collider in KEK, Japan will operate at an instantaneous luminosity of $8 \times 10^{35} cm^{−2} s^{−1}$, which is about 40 times larger than that of its predecessor, Belle. It is built with the aim of collecting a huge amount of data corresponding to an integrated luminosity of about $50 ab^{−1}$ by 2025 for precise measurements of CP violation and searches for new physics, such as flavor-changing neutral currents, probing
charged Higgs, new sources of CP violation, lepton-flavour violating decays, and searches for a dark photon. At this high luminosity, Belle II will face harsh backgrounds. To validate the performance of a key component of Belle II, the silicon vertex detector (SVD), in such a high rate and background environment, a detailed systematic performance study is essential using the offline reconstruction software. In this work, the performance of the Belle II SVD is validated using commissioning data for each double-sided silicon strip sensor. These studies help us to optimize the operation parameters of the SVD.