Speaker
Description
An automated bandwidth division has been deployed, in the LHCb HLT1, since 2024. This procedure uses adaptive moment estimation to determine the optimal selection criteria while satisfying constraints such as the total HLT1 output rate and thresholds shared between common trigger categories. The bandwidth division is now widely available to the collaboration for development and testing of new trigger lines via Continuous Integration (CI) on GitLab, providing information about exclusive and inclusive rates per trigger line, trigger efficiencies for each simulation sample included, and inclusive rate overlap between trigger lines. A goal is to develop the bandwidth division CI into allowing pseudo-real-time tunings, by integrating it with the existing LHCb infrastructure. This will enable the end-users to study and monitor the effect of selection criteria on the trigger rate for the study and monitoring of trigger performance. Studies for introducing an anti-correlation penalty term in the minimisation figure of merit have been performed, to increase stability and the monotonicity of the optimised HLT1 selection thresholds across a range of output rates. This talk will present the bandwidth division algorithm, and the development towards having a pseudo-real-time bandwidth division for LHC Run 4.
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