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Alignment for the first precision measurements at Belle II

2020; EDP Sciences; Volume: 245; Linguagem: Inglês

10.1051/epjconf/202024502023

2101-6275

T. Bilka, Jesus Abudinen, K. Ackermann, K. Adamczyk, P. Ahlburg, H. Aihara, Oscar Alonso, Mohammed Albalawi, L. Andricek, R. Ayad, Tariq Aziz, Varghese Babu, S. Bacher, S. Bahinipati, Giovanni Batignani, J. Baudot, P. K. Behera, S. Bettarini, M. Boronat, A. Bożek, N. Braun, F. Buchsteiner, A. Caldwell, C. Camien, G. Casarosa, D. Červenkov, V. Chekelian, Yeqi Chen, Kirill Chilikin, L. Corona, T. Czank, S. Das, N. Dash, G. de Marino, B. Deschamps, Á. Diéguez, J. Dingfelder, Z. Doležal, G. Dujany, D. Esperante Pereira, F. Forti, M. Fras, A. Frey, M. Friedl, J. Fuster, Miroslav Gabriel, K. Gadow, E. Ganiev, U. Gebauer, Thomas Geßler, G. Giakoustidis, L. Li Gioi, B. Gobbo, P. Gomis, D. Greenwald, Y. Guan, S. Halder, K. Hara, O. Hartbrich, S. Hazra, Martin Heck, T. Hemperek, Martin Hensel, T. Higuchi, M. Hoek, S. Huber, Ryosuke Itoh, C. Irmler, A. Ishikawa, Hyebin Jeon, C. Joo, M. Kaleta, A. B. Kaliyar, J. Kandra, K. H. Kang, P. Kapusta, C. Kiesling, B. Kisielewski, D. Kittlinger, C. Kleinwort, Daniel Klose, P. Kodyš, Christian Koffmane, T. Kohriky, Tomoyuki Kono, I. Konorov, S. Krivokuca, H. Krüger, T. Kuhr, Manish Kumar, R. Kumar, P. Kvasnička, C. Lacasta, Chiara La Licata, K. Lalwani, L. Lanceri, J. S. Lange, K. Lautenbach, S. C. Lee, U. Leis, P. Leitl, D. Levit, Chunhua Li, Yao Li, James Frederick Libby, Gerhard Liemann, Qingyuan Liu, Zhi Liu, Thomas Lück, F. Luetticke, L. Macharski, S. Maity, C. Mariñas, S.N. Mayekar, S. Mccarney, G. B. Mohanty, J. A. Mora Grimaldo, T. Morii, Hans-Günther Moser, David Moya, Felix Johannes Müller, Felix Müller, K. R. Nakamura, Mikihiko Nakao, Z. Natkaniec, C. Niebuhr, J. Ninković, Y. Onuki, W. Ostrowicz, A. Paladino, E. Paoloni, H. Park, S.-H. Park, B. Paschen, S. Paul, I‎. ‎Perić, Frauke Poblotzki, Andrei Rabusov, K. Rao, S. Reiter, Rainer Richter, I. Ripp-Baudot, M. Ritter, M. Ritzert, G. Rizzo, N. Rout, D. Sahoo, J. González Sánchez, L. Šantelj, Nobuhiko Sato, B. Scavino, Gerhard Schäller, M. Schnecke, F. Schopper, H. Schreeck, C. Schwanda, B. Schwenker, R. Sedlmeyer, C. Sfienti, F. Simon, S. Skambraks, Yuri Soloviev, B. Spruck, S. Stefkova, R. Stever, U. Stolzenberg, S. Suzuki, M. Takahashi, E. Tafelmayer, Shuji Tanaka, H. Tanigawa, Richard Thalmeier, T. Tsuboyama, Y. Uematsu, O. Verbycka, I. Vila, Amparo Lopez Virto, L. Vitale, S. Vogt, M. Vos, Kun Wan, Qingji Wang, Shun Watanuki, J. Angus Webb, N. Wermes, C. Wessel, J. Wiechczynski, P. Wieduwilt, H. Windel, S. Yamada, H. Ye, Hao Yin, L. Zani, Tingyu Zhang,

Astrophysics and Cosmic Phenomena

On March 25th 2019, the Belle II detector recorded the first collisions delivered by the SuperKEKB accelerator. This marked the beginning of the physics run with vertex detector. The vertex detector was aligned initially with cosmic ray tracks without magnetic field simultaneously with the drift chamber. The alignment method is based on Millepede II and the General Broken Lines track model and includes also the muon system or primary vertex position alignment. To control weak modes, we employ sensitive validation tools and various track samples can be used as alignment input, from straight cosmic tracks to mass-constrained decays. With increasing luminosity and experience, the alignment is approaching the target performance, crucial for the first physics analyses in the era of Super-BFactories. We will present the software framework for the detector calibration and alignment, the results from the first physics run and the prospects in view of the experience with the first data.