| Issue |
EPJ Web Conf.
Volume 245, 2020
24th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2019)
|
|
|---|---|---|
| Article Number | 02023 | |
| Number of page(s) | 9 | |
| Section | 2 - Offline Computing | |
| DOI | https://doi.org/10.1051/epjconf/202024502023 | |
| Published online | 16 November 2020 | |
https://doi.org/10.1051/epjconf/202024502023
Alignment for the first precision measurements at Belle II
1
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: bilka@ipnp.mff.cuni.cz
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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