TY - JOUR
T1 - Level 1 trigger system for the Belle II experiment
AU - Iwasaki, Yoshihito
AU - Cheon, Byung Gu
AU - Won, Eunil
AU - Gao, Xin
AU - Macchiarulo, Luca
AU - Nishimura, Kurtis
AU - Varner, Gary
N1 - Funding Information:
Manuscript received June 30, 2010; revised December 02, 2010, February 10, 2011; accepted February 17, 2011. Date of publication March 28, 2011; date of current version August 17, 2011. This work was supported by the National Research Foundation of Korea under Grant No. 2009-0076449.
PY - 2011/8
Y1 - 2011/8
N2 - The super-KEKB B factory, currently under construction at the KEK High Energy Accelerator Research Organization in Japan, has a goal of producing 50 ab -1 of integrated luminosity, thus allowing the Belle II experiment to study rare decays of B mesons, D mesons, and τ leptons. Such large statistics on these decays provide an experimental probe of physics beyond the Standard Model. An online trigger system is indispensable to Belle II to reduce the number of beam background events associated with high electron and positron beam currents, as well as to enhance physics-oriented events. For this purpose, we have designed the Belle II online trigger system with two kinds of primary Level 1 trigger components: a track trigger and an energy trigger. The track trigger is composed of 2-dimensional and 3-dimensional tracking algorithms, and the energy trigger implements algorithms based on total energy, isolated clusters, and identification of Bhabha events. In addition, precise event trigger timing and muon tagging information are provided by the time-of-propagation detector and iron flux return muon detector, respectively.
AB - The super-KEKB B factory, currently under construction at the KEK High Energy Accelerator Research Organization in Japan, has a goal of producing 50 ab -1 of integrated luminosity, thus allowing the Belle II experiment to study rare decays of B mesons, D mesons, and τ leptons. Such large statistics on these decays provide an experimental probe of physics beyond the Standard Model. An online trigger system is indispensable to Belle II to reduce the number of beam background events associated with high electron and positron beam currents, as well as to enhance physics-oriented events. For this purpose, we have designed the Belle II online trigger system with two kinds of primary Level 1 trigger components: a track trigger and an energy trigger. The track trigger is composed of 2-dimensional and 3-dimensional tracking algorithms, and the energy trigger implements algorithms based on total energy, isolated clusters, and identification of Bhabha events. In addition, precise event trigger timing and muon tagging information are provided by the time-of-propagation detector and iron flux return muon detector, respectively.
KW - Belle II experiment
KW - Level I hardware trigger
KW - super-KEKB factory
UR - http://www.scopus.com/inward/record.url?scp=84860388848&partnerID=8YFLogxK
U2 - 10.1109/TNS.2011.2119329
DO - 10.1109/TNS.2011.2119329
M3 - Article
AN - SCOPUS:84860388848
SN - 0018-9499
VL - 58
SP - 1807
EP - 1815
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
IS - 4 PART 1
M1 - 5740389
ER -