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Granularity study on bb muX samples

This study by Erik van der Kraaij at CERN LCD explores granularity changes impacting muon samples, efficiency, and purity. Updates in Marlin version improve reconstruction times and define muon matching criteria. The results highlight the impact of cell size on efficiency and purity in the detector design.

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Granularity study on bb muX samples

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  1. Granularity study on bbmuX samples Erik van der Kraaij CERN LCD

  2. Changes since last results • Marlin version updated with several fixes.(still v01-11-pre02) and using latest steering file • Long reconstruction times gone: this was due to too many hits in the FTDs. Fixed by changing the cone-size • Crashes are also gone now  each sample has 9k events • A matching muon is now defined by looking at the track energy: • E_cut_Transverse = 0.05*(EMCT)2 Erik van der Kraaij, CERN LCD

  3. Averaged efficiency & purity • Still some jobs crashed  not all samples have equal #muons • Muon acceptancy cuts: • E > 7.5 GeV • Theta > 8° Erik van der Kraaij, CERN LCD

  4. Averaged efficiency & purity Erik van der Kraaij, CERN LCD

  5. Granularity 30,40,50,60,90 Efficiency vs theta Purity vs theta Efficiency vs energy Purity vs energy Erik van der Kraaij, CERN LCD

  6. Granularity 30,40,50,60,90 Same as previous slide with more bins • For some reason the 50x50 performs worse over full range. Efficiency vs theta Purity vs theta Efficiency vs energy Purity vs energy Erik van der Kraaij, CERN LCD

  7. Conclusion on cell size • Efficiency worsen with bigger cells, purity is not affected • From the bad results for 50x50: either fluctuation, or this size “fits badly” with the overall detector design parameters. • 40x40 mm2 is a safe choice, going to 60x60 mm2 seems also ok. Erik van der Kraaij, CERN LCD

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