The Software Framework of the Belle II Silicon Vertex Detector and its Development for the 2016 Test-Beam at DESY

G Caria ,Ti Baroncelli,T Bilka,T Kawasaki,Z Doležal,J Stypula,S Bettarini,I J Watson,C La Licata,B Bhuyan,T Higuchi,P Mammini,H B Jeon,A Profeti,K H Kang,W Ostrowicz,T Tsuboyama,J Lettenbicher,I Rashevskaya,M M Kolwalkar,T Morii,M Watanabe,L Zani,T Lueck,V Babu,To Baroncelli,G B Mohanty,L Lanceri,H Park,J Libby,T Horiguchi,Z Natkaniec,J Wiechczynski,A Paladino,S N Mayekar,K Adamczyk,T Kohriki,F Buchsteiner,S R Chendvankar,L Bosisio,S Uozumi,Y Onuki,R Thalmeier,G Rizzo,S Schultschik,C Schwanda,L Vitale,G N Taylor,B Würkner,F Forti,G Casarosa,S Bacher,E Paoloni,N Dash,Y Seino,S T Divekar,D Červenkov ,N Sato ,A Bożek ,M Friedl ,P K Behera ,H Yin ,P Kodyč ,Nobuhiro Shimizu ,S Watanuki ,Naoshige Kambara ,H Yamamoto ,Kun Wei ,G De Pietro ,T Bergauer ,A Ishikawa ,F Bosi ,Raj Kumar ,C Joo ,G Batignani ,S T Koike ,D Dutta ,S Williams ,R Thomas ,Hiroyuki Aihara ,M Ceccanti ,C Angelini ,S Tanaka ,E Barberio ,F Pilo ,M Różańska ,J Kandra ,J Sasaki ,P K Resmi ,S Bahinipati ,Anton J Bauer ,P Kvasnička ,C Irmler ,T Yoshinobu ,S Mohanty ,K K Rao ,K R Nakamura ,K Hara ,T Aziz ,Abdul Basith ,Jun‐Ichi Suzuki ,P Urquijo ,M Maki ,Lukas Bulla ,J C Webb

doi:10.22323/1.287.0060

Abstract

The Silicon Vertex Detector of Belle II will be fundamental not only for the reconstruction of B meson vertices, but also for the reconstruction of neutral particles like K shorts, and the tracking of low-pt particles like slow pions associated with the decays of the abundant D* mesons. As a consequence great importance is given to the performance of the software that deals with the simulation and reconstruction of the SVD events. The Belle II experiment is the successor to Belle, one of the two experiments that first observed CP violation in the decay of B mesons. The SuperKEKB collider will deliver 40 times more luminosity than its predecessor KEKB, which requires major upgrades to the detector hardware. This also poses new challenges not only for the data collection and storage, but also for the software framework which is used to process and analyse the experimental data. In this article we present in detail the SVD software framework together with its development for the test of the Vertex Detector system, which took place at DESY in April 2016 using an electron beam.

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