M. Ebert
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View article: Data Preservation in High Energy Physics
Data Preservation in High Energy Physics Open
Data preservation significantly increases the scientific output of high-energy physics experiments during and after data acquisition. For new and ongoing experiments, the careful consideration of long-term data preservation in the experime…
View article: The Canadian Belle II Tier1 Raw Data Centre
The Canadian Belle II Tier1 Raw Data Centre Open
We present our innovative design to hosting Canada’s share of the Belle II raw data and the necessary computing infrastructure for its processing. Our approach involves disk-only grid storage solution that utilizes XRootD and ZFS, compleme…
View article: Using S3 storage with XRootD vs Dynafed
Using S3 storage with XRootD vs Dynafed Open
The High Energy Physics Research Computing group at UVic used Dynafed to create federated storage clusters for Belle II and ATLAS that were used by worker nodes deployed on cloud computing facilities around the world. Since the development…
View article: The <i>BABAR</i> Long Term Data Preservation and Computing Infrastructure
The <i>BABAR</i> Long Term Data Preservation and Computing Infrastructure Open
B A B AR stopped data collection in 2008, but its data is still analyzed by the collaboration. In 2021, a new computing system outside the SLAC National Accelerator Laboratory was developed, the new B A B AR Long Term Data Analysis system …
View article: An Implementation of Cloud-based Grid CE and SE For ATLAS and Belle II
An Implementation of Cloud-based Grid CE and SE For ATLAS and Belle II Open
The economies of scale realised by institutional and commercial cloud providers make such resources increasingly attractive for grid computing. We describe an implementation of this approach which has been deployed for Australia’s ATLAS an…
View article: Managing remote cloud resources for multiple HEP VOs with cloudscheduler
Managing remote cloud resources for multiple HEP VOs with cloudscheduler Open
Cloudscheduler is a system to manage resources of local and remote compute clouds and makes those resources available to HTCondor pools. It examines the resource needs of idle jobs, then starts virtual machines (VMs), sized accordingly, on…
View article: <i>BABAR’</i>s Experience with the Preservation of Data and Analysis Capabilities
<i>BABAR’</i>s Experience with the Preservation of Data and Analysis Capabilities Open
The BABAR experiment collected electron-positron collisions at the SLAC National Accelerator Laboratory (SLAC) from 1999-2008. Although data taking has stopped 15 years ago, the collaboration is still actively doing data analyses, publishi…
View article: An Alternative Scheme for Pionless EFT: Neutron-Deuteron Scattering in the Doublet S-Wave
An Alternative Scheme for Pionless EFT: Neutron-Deuteron Scattering in the Doublet S-Wave Open
Using the effective-range expansion for the two-body amplitudes may generate spurious sub-threshold poles outside of the convergence range of the expansion. In the infinite volume, the emergence of such poles leads to the breakdown of unit…
View article: An alternative scheme for pionless EFT: neutron-deuteron scattering in the doublet S-wave
An alternative scheme for pionless EFT: neutron-deuteron scattering in the doublet S-wave Open
Using the effective-range expansion for the two-body amplitudes may generate spurious sub-threshold poles outside of the convergence range of the expansion. In the infinite volume, the emergence of such poles leads to the breakdown of unit…
View article: Integration of low loss vertical slot waveguides on SOI photonic platforms for high efficiency carrier accumulation modulators
Integration of low loss vertical slot waveguides on SOI photonic platforms for high efficiency carrier accumulation modulators Open
Silicon accumulation type modulators offer prospects of high power efficiency, large bandwidth and high voltage phase linearity making them promising candidates for a number of advanced electro-optic applications. A significant challenge i…
View article: High-Throughput Cloud Computing with the Cloudscheduler VM Provisioning Service
High-Throughput Cloud Computing with the Cloudscheduler VM Provisioning Service Open
We describe a high-throughput computing system for running jobs on public and private computing clouds using the HTCondor job scheduler and the cloudscheduler VM provisioning service. The distributed cloud computing system is designed to s…
View article: Cloudscheduler: a VM provisioning system for a distributed compute cloud
Cloudscheduler: a VM provisioning system for a distributed compute cloud Open
We describe a high-throughput computing system for running jobs on public and private computing clouds using the HTCondor job scheduler and the cloudscheduler VM provisioning service. The distributed cloud computing system is designed to s…
View article: The Dynafed data federator as a grid site storage element
The Dynafed data federator as a grid site storage element Open
The Dynafed data federator is designed to present a dynamic and unified view of a distributed file repository. We describe our use of Dynafed to construct a production-ready WLCG storage element (SE) using existing grid storage endpoints a…
View article: ATLAS Sim@P1 upgrades during long shutdown two
ATLAS Sim@P1 upgrades during long shutdown two Open
The Simulation at Point1 (Sim@P1) project was built in 2013 to take advantage of the ATLAS Trigger and Data Acquisition High Level Trigger (HLT) farm. The HLT farm provides around 100,000 cores, which are critical to ATLAS during data taki…
View article: Measurement of hadronic cross-sections with the BaBar detector
Measurement of hadronic cross-sections with the BaBar detector Open
A program of measuring the light hadrons production in exclusive $e^+e^-$ to hadrons processes is in place at BaBar with the aim to improve the calculation of the hadronic contribution to the muon $g-2$. We present the most recent results …
View article: Using a dynamic data federation for running Belle-II simulation applications in a distributed cloud environment
Using a dynamic data federation for running Belle-II simulation applications in a distributed cloud environment Open
The dynamic data federation software Dynafed, developed by CERN IT, provides a federated storage cluster on demand using the HTTP protocol with WebDAV extensions. Traditional storage sites which support an experiment can be added to Dynafe…
View article: Sim@P1: Using Cloudscheduler for offline processing on the ATLAS HLT farm
Sim@P1: Using Cloudscheduler for offline processing on the ATLAS HLT farm Open
The Simulation at Point1 (Sim@P1) project was established in 2013 to take advantage of the Trigger and Data Acquisition High Level Trigger (HLT) farm of the ATLAS experiment at the LHC. The HLT farm is a significant compute resource, which…
View article: Integrating a dynamic data federation into the ATLAS distributed data management system
Integrating a dynamic data federation into the ATLAS distributed data management system Open
Input data for applications that run in cloud computing centres can be stored at remote repositories, typically with multiple copies of the most popular data stored at many sites. Locating and retrieving the remote data can be challenging,…
View article: Quasi-online accounting and monitoring system for distributed clouds
Quasi-online accounting and monitoring system for distributed clouds Open
The HEP group at the University of Victoria operates a distributed cloud computing system for the ATLAS and Belle II experiments. The system uses private and commercial clouds in North America and Europe that run OpenStack, Open Nebula or …
View article: Measurement of cos 2β in B⁰ → D(*)h⁰ with D→K⁰[subscript S]π⁺π⁻ decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data
Measurement of cos 2β in B⁰ → D(*)h⁰ with D→K⁰[subscript S]π⁺π⁻ decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data Open
We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B⁰ → D(*)h⁰ with D→K⁰[subscript S]π⁺π⁻ decays, where the light unflavored and neutral hadron h⁰ is a π⁰, η, or ω meson. The analysis uses a combinatio…
View article: Update on the recent progress of the CUORE experiment
Update on the recent progress of the CUORE experiment Open
CUORE is a 741 kg array of 988 TeO$_2$ bolometeric crystals designed to\nsearch for the neutrinoless double beta decay of $^{130}$Te and other rare\nprocesses. CUORE has been taking data since summer 2017, and as of summer 2018\ncollected …
View article: Evaluation of ZFS as an efficient WLCG storage backend
Evaluation of ZFS as an efficient WLCG storage backend Open
A ZFS based software raid system was tested for performance against a hardware raid system providing storage based on the traditional Linux file systems XFS and EXT4. These tests were done for a healthy raid array as well as for a degraded…
View article: Searches for exotica at BaBar
Searches for exotica at BaBar Open
Recent BaBar results for the search for lepton-number violating decay modes and the search for a dark photon are presented. 11 different lepton-number violating B decays have been analyzed and for the modes B+→K−l+l′+, B+→K⁎−l+l′+, and B+→…
View article: Bottomonium spectroscopy and radiative transitions involving the χ[subscript bJ](1P,2P) states at BaBar
Bottomonium spectroscopy and radiative transitions involving the χ[subscript bJ](1P,2P) states at BaBar Open
We use (121 ± 1) million Υ(3S) and (98 ± 1) million Υ(2S) mesons recorded by the BABAR detector at the PEP-II e[superscript +]e[superscript -] collider at SLAC to perform a study of radiative transitions involving the χ[subscript bJ](1P,2P…