scholarly journals The Performance of Belle II High Level Trigger in the First Physics Run

2020 ◽  
Vol 245 ◽  
pp. 01040
Author(s):  
R. Itoh ◽  
N. Braun ◽  
C. Li ◽  
M. Nakao ◽  
S. Yamada ◽  
...  
Keyword(s):  
B Meson ◽  
New Physics ◽  
Reduction Factor ◽  
Pixel Detector ◽  
Time Data ◽  
High Background ◽  
Level Trigger ◽  
Belle Ii ◽  
High Level ◽  
New Generation

The Belle II experiment is a new generation B-factory experiment at KEK in Japan aiming at the search for New Physics in a huge sample of B-meson decays. The commissioning of the accelerator and the detector for the first physics run has started from March this year. The Belle II High Level Trigger (HLT) is fully working in the beam run. The HLT is now operated with 1600 cores clusterized in 5 units, which is 1/4 of the full configuration. The software trigger is performed using the same offline reconstruction code, and events are classified into a set of physics categories. Only the events in the categories of interest are finally sent out to the storage. Live data quality monitoring is also performed on HLT. For the selected events, the reconstructed tracks are extrapolated to the surface of the pixel detector (PXD) and quickly fed back to the readout electronics for the real time data reduction by sending only the associated hits. The maximum trigger rate in the first physics run was 3.5kHz, and the Belle II data acquisition system was stably operated. There were several problems in the HLT operation, but they have successfully been fixed during the data taking period. The HLT reduction factor is measured to be 8 which is still higher than the design because of the high background environment.

scholarly journals Belle-II High Level Trigger at SuperKEKB

2012 ◽  
Vol 396 (1) ◽  
pp. 012029
Author(s):  
S Lee ◽  
R Itoh ◽  
T Higuchi ◽  
M Nakao ◽  
S Y Suzuki ◽  
...  
Keyword(s):  
Level Trigger ◽  
Belle Ii ◽  
High Level

scholarly journals Design and Performance of the Belle II High Level Trigger

2021 ◽  
Author(s):  
Markus Tobias Prim ◽  
N. Braun ◽  
Y. Guan ◽  
O. Hartbrich ◽  
R. Itoh ◽  
...  
Keyword(s):  
Level Trigger ◽  
Belle Ii ◽  
And Performance ◽  
High Level

scholarly journals Development of High Level Trigger Software for Belle II at SuperKEKB

2011 ◽  
Vol 331 (2) ◽  
pp. 022015 ◽  
Author(s):  
S Lee ◽  
R Itoh ◽  
N Katayama ◽  
S Mineo
Keyword(s):  
Level Trigger ◽  
Belle Ii ◽  
High Level

Data Flow and High Level Trigger of Belle II DAQ System

2013 ◽  
Vol 60 (5) ◽  
pp. 3720-3724 ◽  
Author(s):  
R. Itoh ◽  
T. Higuchi ◽  
M. Nakao ◽  
S. Y. Suzuki ◽  
S. Lee
Keyword(s):  
Data Flow ◽  
Level Trigger ◽  
Belle Ii ◽  
High Level

scholarly journals A real-time FPGA-based cluster finding algorithm for LHCb silicon pixel detector

2021 ◽  
Vol 251 ◽  
pp. 04016
Author(s):  
Giovanni Bassi ◽  
Luca Giambastiani ◽  
Federico Lazzari ◽  
Michael J. Morello ◽  
Tommaso Pajero ◽  
...  
Keyword(s):  
Real Time ◽  
Heterogeneous Computing ◽  
Clustering Algorithm ◽  
General Purpose ◽  
Pixel Detector ◽  
Promising Alternative ◽  
Level Trigger ◽  
High Level ◽  
High Degree ◽  
Algorithm Implementation

Starting from the next LHC run, the upgraded LHCb High Level Trigger will process events at the full LHC collision rate (averaging 30 MHz). This challenging goal, tackled using a large and heterogeneous computing farm, can be eased addressing lowest-level, more repetitive tasks at the earliest stages of the data acquisition chain. FPGA devices are very well-suited to perform with a high degree of parallelism and efficiency certain computations, that would be significantly demanding if performed on general-purpose architectures. A particularly time-demanding task is the cluster-finding process, due to the 2D pixel geometry of the new LHCb pixel detector. We describe here a custom highly parallel FPGA-based clustering algorithm and its firmware implementation. The algorithm implementation has shown excellent reconstruction quality during qualification tests, while requiring a modest amount of hardware resources. Therefore it can run in the LHCb FPGA readout cards in real time, during data taking at 30 MHz, representing a promising alternative solution to more common CPU-based algorithms.

Data flow and high level trigger of belle II DAQ system

2012 ◽  
Author(s):  
R. Itoh ◽  
T. Higuchi ◽  
M. Nakao ◽  
S.Y. Suzuki ◽  
S. Lee
Keyword(s):  
Data Flow ◽  
Level Trigger ◽  
Belle Ii ◽  
High Level

scholarly journals Tau polarimetry in B meson decays

2019 ◽  
Author(s):  
Rodrigo Alonso ◽  
Jorge Martin Camalich ◽  
Susanne Westhoff
Keyword(s):  
B Meson ◽  
New Physics ◽  
B Meson Decays ◽  
Meson Decays ◽  
Tau Decays ◽  
Decay Products ◽  
Recent Developments ◽  
Belle Ii ◽  
Polarization Observables ◽  
Hadronic Tau

This article summarizes recent developments in B\to D^{(\ast)}\tau\nuB→D(*)τν decays. We explain how to extract the tau lepton’s production properties from the kinematics of its decay products. The focus is on hadronic tau decays, which are most sensitive to the tau polarizations. We present new results for effects of new physics in tau polarization observables and quantify the observation prospects at BELLE II.

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