Alignment for the first precision measurements at Belle II
Authors: Bilka Tadeas , Abudinen Jesus , Ackermann Karlheinz Georg , Adamczyk Karol Mateusz , Ahlburg Patrick , Aihara Hiroaki , Alonso Oscar , Albalawi Mohammed , Andricek Ladislav , Ayad Rachid , Aziz Tariq , Babu Varghese , Bacher Szymon Grzegorz , Bahinipati Seema , Batignani Giovanni , Baudot Jerome , Behera Prafulla Kumar , Bettarini Stefano , Boronat Marca , Bozek Andrzej , Braun Nils , Buchsteiner Florian , Caldwell Allen , Camien Christian , Casarosa Giulia , Cervenkov Daniel , Chekelian Vladimir , Chen Yeqi , Chilikin Kirill , Corona Luigi , Czank Thomas Rafael , Das Sanjeeda Bharati , Dash Nibedita , de Marino Gaetano , Deschamps Bruno , Dieguez Angel , Dingfelder Jochen , Doležal Zdeněk , Dujany Giulio , Esperante Daniel , Forti Francesco , Fras Markus , Frey Ariane , Friedl Markus , Fuster Juan , Gabriel Miroslav , Gadow Karsten , Ganiev Eldar , Gebauer Uwe , Gessler Thomas , Giakoustidis Georgios , Gioi Luigi Li , Gobbo Benigno , Gomis López Pablo , Greenwald Daniel , Guan Yinghui , Halder Soumen , Hara Koji , Hartbrich Oskar , Hazra Sagar , Heck Martin , Hemperek Tomasz , Hensel Martin , Higuchi Takeo , Hoek Matthias , Huber Stefan , Itoh Ryosuke , Irmler Christian , Ishikawa Akimasa , Jeon Hyebin , Joo Changwoo , Kaleta Mateusz , Kaliyar Abdul Basith , Kandra Jakub , Kang Kookhyun , Kapusta Piotr Julian , Kiesling Christian , Kisielewski Bartlomiej , Kittlinger David , Kleinwort Claus , Klose Daniel , Kodyš Peter , Koffmane Christian , Kohriky T. , Kono Tomoyuki , Konorov Igor , Krivokuca Silvia , Krüger Hans , Kuhr Thomas , Kumar Manish , Kumar Rajeev , Kvasnička Peter , Lacasta Carlos , La Licata Chiara , Lalwani Kavita , Lanceri Livio , Lange Jens Sören , Lautenbach Klemens , Lee Seungcheol , Leis Ulrich , Leitl Philipp , Levit Dmytro , Li Chunhua , Li Y. B. , Libby James Frederick , Liemann Gerhard , Liu Qingyuan , Liu Zhen’An , Lück Thomas , Luetticke Florian , Macharski Lydia , Maity Souvik , Mariñas Carlos , Mayekar Sukant Narendra , Mccarney Sara , Mohanty Gagan Bihari , Mora Grimaldo Johnny Alejandro , Morii Tomoko , Moser Hans-Günther , Moya David , Müller Felix Johannes , Müller Felix , Nakamura Katsuro , Nakao Mikihiko , Natkaniec Zbigniew Marian , Niebuhr Carsten , Ninkovic Jelena , Onuki Yoshiyuki , Ostrowicz Waclaw , Paladino Antonio , Paoloni Eugenio , Park Hwanbae , Park SeokHee , Paschen Botho , Paul Stephan Martin , Peric Ivan , Poblotzki Frauke , Rabusov Andrei , Rao K. K. , Reiter Simon , Richter Rainer Helmut , Ripp-Baudot Isabelle , Ritter Martin , Ritzert Michael , Rizzo Giuliana , Rout Niharika , Sahoo Debashis , Sanchez Javier Gonzalez , Santelj Luka , Sato Nobuhiko , Scavino Bianca , Schaller Gerhard , Schnecke Martina , Schopper Florian , Schreeck Harrison , Schwanda Christoph , Schwenker Benjamin , Sedlmeyer Reinhard , Sfienti Concettina , Simon Frank , Skambraks Sebastian , Soloviev Yuri , Spruck Björn , Stefková Slavomira , Stever Reimer , Stolzenberg Ulf , Suzuki Soh Yamagata , Takahashi Maiko , Tafelmayer Eva , Tanaka Shuji , Tanigawa Hikaru , Thalmeier Richard , Tsuboyama Toru , Uematsu Yuma , Verbycka O. , Vila Ivan , Virto Amparo Lopez , Vitale Lorenzo , Vogt Sven , Vos Marcel , Wan Kun , Wang Boqun , Watanuki Shun , Webb James , Wermes Norbert , Wessel Christian , Wiechczyński Jarosław Paweł , Wieduwilt Philipp , Windel Hendrik , Yamada Satoru , Ye Hua , Yin Hao , Zani Laura , Zhang Tingyu 
Published: November 2020

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.