Measurement of the Jet Energy Scale in the CMS experiment ... - IIHE
Measurement of the Jet Energy Scale in the CMS experiment ... - IIHE
Measurement of the Jet Energy Scale in the CMS experiment ... - IIHE
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66 CHAPTER 4: Reconstruct<strong>in</strong>g and Select<strong>in</strong>g Physics Eventt¯t t¯t W+jets Z+jets t QCD→ e + jets → o<strong>the</strong>r → l + jets → l + l − + jets → l + jets multijetsInitial 2333.0 13417.0 3131400.0 304800.0 3293.0 5.6E+8Pre-Selection 1917.3 5449.0 12961.9 4909.2 565.0 6681710.1PV 1916.5 5446.5 12958.5 4907.6 564.8 6680208.7One Electron 1053.0 360.6 5369.9 2121.1 154.2 12280.22 nd Electron Veto 1021.9 310.0 5313.9 1045.4 149.1 12135.3Muon Veto 1019.2 221.7 5308.0 1039.5 146.0 12120.3Four <strong>Jet</strong>s 405.9 50.5 241.0 28.1 19.1 379.2One B <strong>Jet</strong> 307.8 39.1 30.2 4.5 13.5 35.6Selection Efficiency (%) 13.2 0.3 0.0 0.0 0.4 0.0Table 4.6: Table <strong>of</strong> event selection cuts. The numbers are equivalent to an <strong>in</strong>tegrated lum<strong>in</strong>osity <strong>of</strong> 100pb −1 . Also shown <strong>in</strong><strong>the</strong> last row <strong>of</strong> <strong>the</strong> table, is <strong>the</strong> efficiency <strong>of</strong> <strong>the</strong> selection cuts which is def<strong>in</strong>ed as <strong>the</strong> survived number <strong>of</strong> events divided by <strong>the</strong><strong>in</strong>itial number <strong>of</strong> events before apply<strong>in</strong>g any cuts. The selection cuts ma<strong>in</strong>ly keep <strong>the</strong> e+jets t¯t events while reject<strong>in</strong>g <strong>the</strong> diversebackgrounds.