D. Britton
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View article: Recent results from the NA62 experiment at CERN
Recent results from the NA62 experiment at CERN Open
The NA62 experiment at CERN SPS is designed to study the $K^+\to\pi^+\nu\bar\nu$ decay. After collecting data in 2016, 2017, and 2018, the experiment has resumed data taking in 2021 and has received approval for operations until the onset …
View article: Taking on RISC for Energy-Efficient Computing in HEP
Taking on RISC for Energy-Efficient Computing in HEP Open
In pursuit of energy-efficient solutions for computing in High Energy Physics (HEP) we have extended our investigations of non-x86 architectures beyond the ARM platforms that we have previously studied. In this work, we have taken a first loo…
View article: Heterogeneous Computing and Power Efficiency in HEP
Heterogeneous Computing and Power Efficiency in HEP Open
The Glasgow ScotGrid facility is now a truly heterogeneous site, with over 4,000 ARM cores representing about 20% of our compute capacity, which has enabled large-scale testing by the experiments and more detailed investigations of perform…
View article: Carbon Compromises: Minimising the Carbon-Cost and Power-Use of Grid Sites
Carbon Compromises: Minimising the Carbon-Cost and Power-Use of Grid Sites Open
This paper presents an overview of ways to reduce the carbonimpact of the Worldwide LHC Computing Grid (WLCG) along with specific results demonstrating the potential benefits of CPUs based on the ARM architecture. The choice of CPUs during…
View article: Latest results from precision measurements at the NA62 experiment
Latest results from precision measurements at the NA62 experiment Open
Then NA62 experiment at CERN collected the world's largest dataset of charged Kaons, the main goal being the measurement of the $\mathcal{B}(K^+ \rightarrow \pi^+ \nu \bar{\nu})$. New results from the analyses of rare kaon and piondecays u…
View article: HEP Benchmark Suite: Enhancing Efficiency and Sustainability in Worldwide LHC Computing Infrastructures
HEP Benchmark Suite: Enhancing Efficiency and Sustainability in Worldwide LHC Computing Infrastructures Open
As the scientific community continues to push the boundaries of computing capabilities, there is a growing responsibility to address the associated energy consumption and carbon footprint. This responsibility extends to the Worldwide LHC C…
View article: NLOPS off-shell effects in precise determinations of the top-quark mass and width at the LHC
NLOPS off-shell effects in precise determinations of the top-quark mass and width at the LHC Open
The precise measurement of the properties of the top quark are among the most important goals of the LHC. The signature o\ f top quarks can only be measured through their decay products, which are almost exclusively a W-boson and a b-quark…
View article: Physics Beyond the Standard Model with the NA62 experiment at CERN
Physics Beyond the Standard Model with the NA62 experiment at CERN Open
The first measurement of the branching ratio of the ultra-rare $K^+ \to \pi^+\nu\bar\nu$ decay and the searches for production of feebly interacting particles predicted by dark scalar models from the NA62 experiment at CERN are presented. …
View article: A holistic study of the WLCG energy needs for the LHC scientific program
A holistic study of the WLCG energy needs for the LHC scientific program Open
The WLCG infrastructure provides the compute power and storage capacity needed by the Large Hadron Collider (LHC) experiments at CERN. The infrastructure is distributed across over 170 data centres in more than 40 countries. The amount of …
View article: ARMing HEP for the future Energy Efficiency of WLCG sites (ARM vs. x86)
ARMing HEP for the future Energy Efficiency of WLCG sites (ARM vs. x86) Open
We present a case for ARM chips as an alternative to standard x86 at WLCG sites to help reduce power consumption. New measurements are presented on the performance and energy consumption of two machines (one ARM and one x86), that were oth…
View article: Measurement of the very rare $K^+ \to \pi^+ \nu \bar\nu$ decay
Measurement of the very rare $K^+ \to \pi^+ \nu \bar\nu$ decay Open
The decay K+→π+νν¯
\n, with a very precisely predicted branching ratio of less than 10−10
\n,
\nis among the best processes to reveal indirect effects of new physics.
\nThe NA62 experiment at CERN SPS is designed to study the K+→π+νν¯
\n d…
View article: Measurement of the very rare K+→π+νν decay at the NA62 experiment at CERN
Measurement of the very rare K+→π+νν decay at the NA62 experiment at CERN Open
The NA62 experiment reports the branching ratio measurement $BR(K^+\\to\\pi^+\\nu\\bar\\nu)$ at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the …
View article: Search for K+ decays to a lepton and invisible particles
Search for K+ decays to a lepton and invisible particles Open
Searches for heavy neutral leptons N
\n in the K+→e+N
\n and K+→μ+N
\n decay channels using the dataset collected by the NA62 experiment at CERN between 2016-2018 are presented. Upper limits on the corresponding mixing matrix elements are …
View article: Learning from the Pandemic: the Future of Meetings in HEP and Beyond
Learning from the Pandemic: the Future of Meetings in HEP and Beyond Open
The COVID-19 pandemic has by-and-large prevented in-person meetings since March 2020. While the increasing deployment of effective vaccines around the world is a very positive development, the timeline and pathway to "normality" is uncerta…
View article: Search for Heavy Neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) Decay and Status of Lepton Universality Test in the PIENU Experiment
Search for Heavy Neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) Decay and Status of Lepton Universality Test in the PIENU Experiment Open
In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays \\(\\pi ^{ + } \\to \\mu ^{ + }\\nu \\). No evidence for extra peak was found in the muon kinetic energy spectrum and 90% confidence level upper limits…
View article: Rituximab and obinutuzumab differentially hijack the B cell receptor and NOTCH1 signaling pathways
Rituximab and obinutuzumab differentially hijack the B cell receptor and NOTCH1 signaling pathways Open
The anti-CD20 monoclonal antibodies rituximab and obinutuzumab differ in their mechanisms of action, with obinutuzumab evoking greater direct B cell death. To characterize the signaling processes responsible for improved B cell killing by …
View article: A hybrid system for monitoring and automated recovery at the Glasgow Tier-2 cluster
A hybrid system for monitoring and automated recovery at the Glasgow Tier-2 cluster Open
We have deployed a central monitoring and logging system based on Prometheus, Loki and Grafana that collects, aggregates and displays metrics and logs from the Tier-2 ScotGrid cluster at Glasgow. Bespoke dashboards built on Prometheus metr…
View article: Search for lepton number violation and other exotic processes at NA62
Search for lepton number violation and other exotic processes at NA62 Open
NA62 is a fixed target experiment at CERN, with the main goal of measuring the branching ratio of the very rare decay $K$$^{+}$ → $\\pi$$^{+}$$\\nu$$\\bar{\\nu}$ However, the wide physics program covered by the experiment allows the search…
View article: Search for the rare decays ${\pi}^+{\rightarrow}{\mu}^+{\nu}_{\mu}{\nu}\bar{\nu}$ and ${\pi}^+{\rightarrow}e^+{\nu}_{e}{\nu}\bar{\nu}$.
Search for the rare decays ${\pi}^+{\rightarrow}{\mu}^+{\nu}_{\mu}{\nu}\bar{\nu}$ and ${\pi}^+{\rightarrow}e^+{\nu}_{e}{\nu}\bar{\nu}$. Open
The rare pion decays ${\pi}^+{\rightarrow}{\mu}^+{\nu}_{\mu}{\nu}\bar{\nu}$ and ${\pi}^+{\rightarrow}e^+{\nu}_{e}{\nu}\bar{\nu}$ are allowed in the Standard Model but highly suppressed. These decays were searched for using data from the PI…
View article: Using Continous Deployment techniques to manage software change at a WLCG Tier-2
Using Continous Deployment techniques to manage software change at a WLCG Tier-2 Open
Continuous Integration (CI) and Continuous Development (CD) are common techniques in software development. Continuous Integration is the practice of bringing together code from multiple developers into a single repository, while Continuous…
View article: Caching technologies for Tier-2 sites: A UK perspective
Caching technologies for Tier-2 sites: A UK perspective Open
Pressures from both WLCG VOs and externalities have led to a desire to "simplify" data access and handling for Tier-2 resources across the Grid. This has mostly been imagined in terms of reducing book-keeping for VOs, and total replicas ne…
View article: Using the Autopilot pattern to deploy container resources at a WLCG Tier-2
Using the Autopilot pattern to deploy container resources at a WLCG Tier-2 Open
Containers are becoming ubiquitous within the WLCG, with CMS announcing a requirement for its sites to provide Singularity during 2018. The ubiquity of containers means it is now possible to reify the combination of an application and its …