CERN Summer Student Session

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Presentation transcript:

CERN Summer Student Session PH - CMM Università di Torino (Italy) Serena Oggero August 14th, 2007 CERN Summer Student Session

CERN Summer Student Session 2007 Outline The CMS High Level Trigger My physics channel My work on CMS software with MC data First results: efficiency measurements Summary Serena Oggero CERN Summer Student Session 2007

CERN Summer Student Session 2007 The CMS HLT CMS detector (40 MHz) What? CMS online event selection code L1 Trigger (100 kHz) Why? most of events produced at LHC are not interesting the interaction rate is larger than what can be recorded Custom-made Hardware HL Trigger (100 Hz) Pc farm CMS Software How? takes events already accepted by the first level trigger (L1) decides whether the event should be kept, based on sequences of more elaborated algorithms ...so any offline analysis depends on the HLT efficiency… Serena Oggero CERN Summer Student Session 2007

CERN Summer Student Session 2007 My physics channel 140 < MH < 700 GeV One of the most promising channel H  Z Z*  l+l- l+l- and I focused on H  Z Z*  e+e- e+e- How it is seen by the CMS detector: Serena Oggero CERN Summer Student Session 2007

CERN Summer Student Session 2007 My work (I) Event sources (Montecarlo) Set of complete events of: H  Z Z*  l+l- l+l- Higgs mass 170 GeV H  Z Z*  e+e- e+e- Higgs mass 190 GeV Filter Module selection of at least 2 e- and 2 e+ per event acceptance cuts: pt > 5 GeV and |η| < 2.7 to preserve electron reconstruction efficiency Serena Oggero CERN Summer Student Session 2007

CERN Summer Student Session 2007 My work (II) Analyzer module - Offline electron reconstruction in several steps: starting from the SuperCluster using information from pixel detector, tracker, HCAL - Run HLT Egamma paths: each path iterates over a collection of reconstructed physics objects and applies cuts Root Ntuple Serena Oggero CERN Summer Student Session 2007

CERN Summer Student Session 2007 HLT table for L = 1032cm-2s-1 HLT paths used Single Electron Double Electron Relaxed Single Electron Relaxed Double Electron L1 seed A_SingleIsoEG12 A_DoubleIsoEG8 A_SingleEG15 A_DoubleEG10 |η| < 2.5 Et < 15 GeV < 10 GeV < 17 GeV < 12 GeV Tk isol < 0.06 < 0.4 HCAL isol barrel < 3 GeV < 9 GeV HCAL isol endcaps E/P barrel < 1.5 - E/P endcaps < 2.45 ..relaxed paths only differ for Et thresholds that are matched with L1.. Serena Oggero CERN Summer Student Session 2007

Results: efficiency tests Efficiency measured on 2 MC samples (~730 events for mH = 190 GeV and ~370 events for mH = 170 GeV): mH = 170 GeV Single Electron Relaxed Single Electron Double Electron Relaxed Double Electron Logical OR Absolute 96,0% 96,2% 92,2% 95,0% (98,4±0,7)% On L1 seed 93,2% HLT_events L1_events ε = HLT_events All_events ε = Single Electron Relaxed Single Electron Double Electron Relaxed Double Electron Logical OR Absolute 97,6% 97,3% 95,8% 97,4% (98,9±0,4)% On L1 seed 95,9% mH = 190 GeV Serena Oggero CERN Summer Student Session 2007

Main sources of inefficiency L1 double seed (double electrons) Pixel match (single and double electrons) Electron E/p cut (single and double electrons) Checking HLT report: Serena Oggero CERN Summer Student Session 2007

CERN Summer Student Session 2007 Some H  4e plots Pt and eta spectrum for events chosen by my first Filter: Serena Oggero CERN Summer Student Session 2007

Many thanks to Roberta Arcidiacono and Nadia Pastrone! Summary & Outlook Written modules for HLT studies on H4e channel efficiency measured on two different MC samples results look promising… …still to do: improve Ntuple structure for a more detailed study study signal and background rates work with higher statistics and other Higgs mass points Many thanks to Roberta Arcidiacono and Nadia Pastrone! Serena Oggero CERN Summer Student Session 2007