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Systematics studies - inelastic QED Compton M.Moritz

Systematics studies - inelastic QED Compton M.Moritz. Question : Can the QEDC flagged events in DIS MC describe the data? Method : Reject elastic QED Compton events Select events with 2 Sinistra candidates ( e cand ,  cand )

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Systematics studies - inelastic QED Compton M.Moritz

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  1. Systematics studies - inelastic QED Compton M.Moritz • Question: • Can the QEDC flagged events in DIS MC describe the data? • Method: • Reject elastic QED Compton events • Select events with 2 Sinistra candidates (ecand, cand) • Take events with ecand has a track and cand doesn’t (cand must be within CTD acceptance) • Use cuts to extract high purity sample and see how well it is described by the Monte Carlo

  2. Systematics studies - inelastic QED Compton • Cuts: • (cand) > 1 rad • |  (ecand) -  (cand)| > 2.5 rad • Only 1 good track in event • E(ecand) + E(cand) > 25 GeV

  3. Results: - Purity - Efficiency - Data/MC nr. events ~ 1.05% (within stat. errors) Systematics studies - inelastic QED Compton • Conclusions: • High purity sample selected (most additional events flagged as ISR, question of definition in MC). • Cut on one good track only responsible for low efficiency but needed for high purity. • The selected MC sample reproduces the data selected with same method.

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