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Home Physics

Bringing new life to ATLAS data

by TimesOfNation
October 23, 2021
in Physics
Bringing new life to ATLAS data
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The ATLAS detector. Credit- CERN

The ATLAS collaboration is breathing new life into its LHC Run 2 dataset, recorded from 2015 to 2018. Physicists will be reprocessing the entire dataset—nearly 18 PB of collision data—using an updated version of the ATLAS offline analysis software (Athena). Not only will this improve ATLAS physics measurements and searches, it will also position the collaboration well for the upcoming challenges of Run 3 and beyond.

Athena converts raw signals recorded by the ATLAS experiment into more simplified datasets for physicists to study. Its new-and-improved version has been in development for several years and includes multi-threading capabilities, more complex physics-analysis functions and improved memory consumption.

“Our aim was to significantly reduce the amount of memory needed to run the software, widen the types of physics analyses it could do and—most critically—allow current and future ATLAS datasets to be analyzed together,” says Zach Marshall, ATLAS Computing Coordinator. “These improvements are a key part of our preparations for future high-intensity operations of the LHC—in particular the High-Luminosity LHC (HL-LHC) run beginning around 2028, which will see ATLAS’s computing resources in extremely high demand.”

This latest version of Athena already makes good headway in reducing the computing resources required for data analysis. For example, the computationally intensive job of taking individual signals from the inner detector and chaining them together to form particle tracks is now two to four times faster. Less disk space is needed to store the results and overall the software runs more smoothly.

The software improvements also feature new ways for physicists to study their data. For example, researchers will now, by default, be able to look for tracks that originate away from the collision point. These could be signatures of particles with long lifetimes and may lead to evidence of exciting beyond-the-Standard-Model physics processes. While such searches were possible with the earlier version of the ATLAS software, the heavy computing resources they required meant they could not always be carried out.

Finally, physicists have also made improvements to the databases containing all of the time-dependent status information of the detector components. These databases—on which Athena runs—now incorporate an improved understanding of the detector’s operation during Run 2. “Every data-taking period is an opportunity for us to learn more about the detector and its subsystems,” says Song-Ming Wang, ATLAS Data Preparation Coordinator. “Revisiting these databases with the benefit of hindsight will allow us to provide even better performance.”

With the new Athena software now up and running, researchers have set out to reprocess the entire Run 2 dataset. This will take several months, as the dataset is quite substantial.

The expected results will be well worth this effort- ATLAS will have a significantly improved dataset that will allow for crisper measurements, more powerful searches and simpler combinations of past and future data.


ATLAS reports first observation of WWW production


Citation–
Bringing new life to ATLAS data (2021, October 22)
retrieved 23 October 2021
from https-//phys.org/news/2021-10-life-atlas.html

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part may be reproduced without the written permission. The content is provided for information purposes only.

(News Source -Except for the headline, this story has not been edited by Times Of Nation staff and is published from a phys.org feed.)

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