20,818 research outputs found
The LHCb prompt charm triggers
The LHCb experiment has fully reconstructed close to 10^9 charm hadron
decays---by far the world's largest sample. During the 2011-2012 running
periods, the effective proton-proton beam crossing rate was 11-15 MHz while the
rate at which events were written to permanent storage was 3-5 kHz. Prompt
charm candidates (produced at the primary interaction vertex) were selected
using a combination of exclusive and inclusive high level (software) triggers
in conjunction with low level hardware triggers. The efficiencies, background
rates, and possible biases of the triggers as they were implemented will be
discussed, along with plans for the running at 13 TeV in 2015 and subsequently
in the upgrade era.Comment: To appear in the proceedings of The 6th International Workshop on
Charm Physics (CHARM 2013
Real-Time Data Processing With Lambda Architecture
Data has evolved immensely in recent years, in type, volume and velocity. There are several frameworks to handle the big data applications. The project focuses on the Lambda Architecture proposed by Marz and its application to obtain real-time data processing. The architecture is a solution that unites the benefits of the batch and stream processing techniques. Data can be historically processed with high precision and involved algorithms without loss of short-term information, alerts and insights. Lambda Architecture has an ability to serve a wide range of use cases and workloads that withstands hardware and human mistakes. The layered architecture enhances loose coupling and flexibility in the system. This a huge benefit that allows understanding the trade-offs and application of various tools and technologies across the layers. There has been an advancement in the approach of building the LA due to improvements in the underlying tools. The project demonstrates a simplified architecture for the LA that is maintainable
- …