Journal article
Global decay chain vertex fitting at Belle II
J-F Krohn, F Tenchini, P Urquijo, F Abudinen, S Cunliffe, T Ferber, M Gelb, J Gemmler, P Goldenzweig, T Keck, I Komarov, T Kuhr, L Ligioi, M Lubej, F Meier, F Metzner, C Pulvermacher, M Ritter, U Tamponi, A Zupanc
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | ELSEVIER | Published : 2020
Abstract
In this paper we report the implementation of a global vertex fitting algorithm within the Belle II analysis software environment, which was originally developed for BaBar (Hulsbergen, 2005). We explore the impact of global vertex fitting algorithms for flavour physics analyses with the Belle II detector at the SuperKEKB collider, such as in the reconstruction of final states with neutral particles, and in fits with geometrical constraints from SuperKEKB’s nano-beam interaction region. The algorithm is compared to the standard vertex fitting algorithm employed by the Belle experiment. We have developed the fitting framework to utilise the EIGEN library for linear algebra operations, reducin..
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Funding Acknowledgements
This work was made possible by the Belle II collaboration and funding from ARC (Australia), ARRS (Slovenia), BMBF (Germany), EXC153 (Germany), HGF (Germany), INFN (Italy), MSMT (Czech Republic), NSERC (Canada) and U.S. DOE. We would like to thank Wouter Hulsbergen for his input.