Periodic Reporting for period 2 - BoostDiscovery (Boosting the discovery using τs in the ATLAS detector at the Large Hadron Collider)
Berichtszeitraum: 2022-07-01 bis 2023-12-31
The program, BoostDiscovery, is expected not only to shed light on one of the biggest open questions in physics, but also to introduce novel techniques for boosted τ+τ− as well as for triggers in collider physics. This new methodology will then be used to have better precision measurements involved τs and to renovate other objects’ triggers.
1. Run2: tagger algorithm is final, validation using ATLAS run2 data is under Editorial Board approval (paper has been written and will be circulated soon).
2. Run3: ATLAS study has been started and dedicated Monte-Carlo samples are being prepared.
Trigger:
1. Boosted ditaus - the new boosted DiTau L1 and HLT triggers have been fully validated in terms of rate and cost and have been officially approved by the ATLAS Trigger Expert.
2. single tau phase 1 - BDT algorithm has been approved and under HW final validations (will be working for the next data year).
3. single tau phase 2 - different NNs have been tried both at the SW and the HW levels. More studies are still needed.
4. Single tau POC paper have been uploaded to the arxiv: Comparing machine learning models for tau triggers (2306.06743).
Analyses:
1. ttX analysis - aiming for unblinding soon - under Editorial Board review).
2. H->xx->yytautau - analysis strategy is final and Editorial Board will form in the next month.
3. The group has joined the Run2 search for resonance decaying to ditau with mass around 95GeV (due to the CMS peak).
Discovering new physics will rely heavily on those advanced algorithms.