Vertex Fitting Progress and Performance Analysis in FCCee Software
In this April 2021 report from Italy, Franco Bedeschi of INFN outlines the progress in vertex fitting using the Garfield/Heed checks. Performance examples with specific event details are provided, showcasing the capabilities of the FCCee software. The report also details the way forward, including potential additional features and improvements to the vertex fitting routine. Various images and data visualizations accompany the findings, illustrating key concepts such as track clustering, K/ ratios for different particle types, and comparisons of gases. The report covers topics such as track length calculations, track parameter updates, and the setup for tertiary vertices. Plans for incorporating these advancements into the latest version of DELPHES are discussed, showcasing a comprehensive overview of the vertex fitting processes and developments in the field.
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Presentation Transcript
Vertex fitting Franco Bedeschi, INFN FCCee software - Italy April 2021 OUTLINE Vertex fitting progess Garfield/Heed checks 1 FCCee SW-Italy, April 2021 F. Bedeschi, INFN-Pisa
Performance (1) Example: 100,000 events, 3 tracks, RV (0-1.5 cm), pt (0.5-1.0 GeV) 2 FCCee SW-Italy, April 2021 F. Bedeschi, INFN-Pisa
Performance (2) Example: 100,000 events, 2 tracks, RV (0-1.5 cm), pt (0.5-1.0 GeV) 3 FCCee SW-Italy, April 2021 F. Bedeschi, INFN-Pisa
Way forward Can turn routine into a class with additional features: Included in latest version of DELPHES Adding/removing individual tracks (easy) Can do simple PR for vertices External vertex constraint (easy): useful for primary vertex Easy but harder to test Calculate updated track parameters and their error matrix Large matrix with correlations (easy), but currently not needed Setup for tertiary vertices (more complex) Calculate total vertex momentum /covariance Allow for vertices with neutral tracks 4 FCCee SW-Italy, April 2021 F. Bedeschi, INFN-Pisa
N clusters from Garfield # clusters/cm from Garfield/Heed See details from Gianfranco/Margherita Calculation of track length inside chamber Extract nr. clusters with Poisson distribution Included in DELPHES class TrkUtil 5 FCCee SW-Italy, April 2021 F. Bedeschi, INFN-Pisa
Example K/ for 90 tracks High end does not match analytic calculation Pions Kaons Rin = 35 cm Rout = 200 cm 6 FCCee SW-Italy, April 2021 F. Bedeschi, INFN-Pisa
Comparison of gases (Heed) 7 FCCee SW-Italy, April 2021 F. Bedeschi, INFN-Pisa
