NDLI: The ALICE Dimuon Spectrometer High Level Trigger

Content Provider	IEEE Xplore Digital Library
Author	Becker, Bruce Chattopadhyay, Sukalyan Cicalo, Corrado Das, Indranil de Vaux, Gareth Fearick, Roger Lindenstruth, Volker Marras, Davide Sanyal, Abhijit Siddhanta, Sabyasachi Staley, Florent Steinbeck, Timm Szostak, Artur Usai, Gianluca Vilakazi, Zeblon
Copyright Year	2008
Description	Author affiliation: CEA, Saclay, DSM/DAPNIA/SPhN, 91191 Gif-Sur-Yvette, France (Staley, Florent) \|\| INFN, Sezione di Cagliari, Cittadella Universitaria 09042 Monserrato, (CA) Italy (Cicalo, Corrado; Marras, Davide; Siddhanta, Sabyasachi; Usai, Gianluca) \|\| Kirchhoff-Institut fur Physik, Im Neuenheimer Feld 227 D-69120 Heidelberg, Germany (Lindenstruth, Volker; Steinbeck, Timm) \|\| Saha Institute of Nuclear Physics, 1/AF, Bidhannagar Kolkata 700 064, India (Chattopadhyay, Sukalyan; Das, Indranil; Sanyal, Abhijit) \|\| UCT-CERN Research Centre, University of Cape Town, Rondebosch, 7700, South Africa (Becker, Bruce; de Vaux, Gareth; Fearick, Roger; Szostak, Artur; Vilakazi, Zeblon)
Abstract	The ALICE Dimuon Spectrometer High Level Trigger (dHLT) is an on-line processing stage whose primary function is to select interesting events that contain distinct physics signals from heavy resonance decays such as J/ψ and ϒ particles, amidst unwanted background events. It forms part of the High Level Trigger of the ALICE experiment, whose goal is to reduce the large data rate of about 25 GB/s from the ALICE detectors by an order of magnitude, without loosing interesting physics events. The dHLT has been implemented as a software trigger within a high performance and fault tolerant data transportation framework, which is run on a large cluster of commodity compute nodes. To reach the required processing speeds, the system is built as a concurrent system with a hierarchy of processing steps. The main algorithms perform partial event reconstruction, starting with hit reconstruction on the level of the raw data received from the spectrometer. Then a tracking algorithm finds track candidates from the reconstructed hit points. Physical parameters such as momentum are extracted from the track candidates and finally a dHLT decision is made to readout the event based on certain trigger criteria. Various simulations and commissioning tests have shown that the dHLT can expect a background rejection factor of at least 5 compared to hardware triggering alone, with little impact on the signal detection efficiency.
Starting Page	1846
Ending Page	1850
File Size	2551072
Page Count	5
File Format	PDF
ISBN	9781424427147
ISSN	10957863
DOI	10.1109/NSSMIC.2008.4774751
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-19
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Physics Clustering algorithms Signal processing Resonance Event detection Detectors Software performance Fault tolerance Transportation
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The ALICE Dimuon Spectrometer High Level Trigger

Implementation of a hit reconstruction algorithm for the ALICE Dimuon High-Level-Trigger

Event reconstruction performance of the ALICE High Level Trigger for p+p collisions

Trigger detectors for the ALICE muon spectrometer

The ALICE Dimuon Forward Spectrometer

Front-end electronics for the ALICE dimuon trigger RPCs

Application-level fault tolerance in the orbital thermal imaging spectrometer

Benchmarks and implementation of the ALICE high level trigger

Benchmarks and implementation of the ALICE high level trigger

The ALICE Dimuon Spectrometer High Level Trigger

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