EPJ Web Conf.
Volume 245, 202024th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2019)
|Number of page(s)||9|
|Section||2 - Offline Computing|
|Published online||16 November 2020|
Alignment for the first precision measurements at Belle II
Charles University, Prague, Czech Republic
2 INFN and Univ. Trieste, Italy
3 Max Planck Institut fur Physik Muenchen, Germany
4 Institute of Nuclear Physics PAN, Poland
5 Univ. of Bonn, Germany
6 U-Tokyo, Japan
7 University of Barcelona, Spain
8 Univ. of Tabuk, Saudi Arabia
9 Semiconductor Laboratory of the Max Planck Society, Germany
10 Tata Institute of Fundamental Research, India
11 Deutsches Elektronen-Synchrotron(DESY), Germany
12 Indian Institute of Technology Bhubaneswar, India
13 INFN and Univ. Pisa, Italy
14 Institut Pluridisciplinaire Hubert Curien (IPHC) Strasbourg, France
15 Indian Institute of Technology Madras, India
16 Instituto de Fisica Corpuscular(IFIC), Spain
17 Karlsruhe Institute of Technology(KIT), Germany
18 Institute of High Energy Physics, Austrian Academy of Sciences, Austria
19 Univ. of Science and Technology of China(USTC), China
20 Kavli IPMU (WPI), the University of Tokyo, Japan
21 Malaviya National Institute of Technology Jaipur, India
22 Univ. of Goettingen, Germany
23 Univ. of Giessen, Germany
24 Technical Univ. of Munich(Technische Universitaet Muenchen), Germany
25 University of Cincinnati, U.S.A.
26 High Energy Accelerator Research Organization (KEK), Japan
27 Univ. of Hawaii, U.S.A.
28 Johannes Gutenberg Univ. of Mainz, Germany
29 Kyungpook National Univ.(KNU), South Korea
30 Kitasato University, Japan
31 Ludwig Maximilians Univ. Muenchen(LMU), Germany
32 Panjab Univ., India
33 LiaoNing Normal University(LNNU), China
34 Peking Univ.(PKU), China
35 Fudan Univ., China
36 Institute of High Energy Physics(IHEP), China
37 Instituto de Fisica de Cantabria, Spain
38 Yonsei Univ., South Korea
39 Heidelberg University, Germany
40 Univ. of Ljubljana, Slovenia
41 Laboratoire de L’accelerateur Lineaire (LAL) Orsay, France
42 Univ. of Melbourne, Australia
43 Lebedev Physical Institute of the Russian Academy of Sciences, Russian Federation
* e-mail: firstname.lastname@example.org
Published online: 16 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.
© The Authors, published by EDP Sciences, 2020
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