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ATLAS analysis One Lepton Mode SUSY

This study presents a detailed analysis of background estimation techniques in SUSY searches, focusing on lepton events from tt and W processes. Utilizing a dataset of 1fb^-1, control samples with specific mass thresholds and jet criteria are employed to enhance accuracy. Various parameters, including leading jet pT, missing transverse energy (mEt), and the number of jets, are examined. The resulting estimation of backgrounds informs about systematic errors, contributing to improved understanding of SUSY signatures against standard model backgrounds.

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ATLAS analysis One Lepton Mode SUSY

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  1. ATLAS analysisOne Lepton Mode SUSY 2007.7.13 Ginga Akimoto

  2. Background estimation (1fb-1) • SU1-SU4 • tt->bblnln • tt->bblnqq • W • Leading Jet pt • mEt • nJet(Pt>50GeV) • Lep Pt • Control Sample (Mt <100GeV) • renormalize by Event # of mEt=100GeV-200GeV

  3. Mt

  4. # Na(Mt<100Gev ) and Nb(Mt=100-400) • Na(ctrl) Nb(100-) N_over • ttlnln 194.876 197.372 • ttlnqq 1773.54 63.2566 • W 786.222 29.0538 • SU1 172.065 236.283 19.1486 • SU2 22.518 30.9096 2.50596 • SU3 325.83 407.035 36.2607 • SU4 3819.93 3238.3 425.109 • N_over=Na(SUSY)/Na(ttlnqq)*Nb(ttlnln) • Nb(SUSY) >> N_over ～10%

  5. Control Sample = [ MT < 100GeV ]

  6. mEt ( -0- is CTRL estimation )

  7. Jet Pt1

  8. nJet

  9. Lepton Pt ( >20GeV)

  10. Mt > 200GeV • low mEt missing @ high Mt Mt mEt

  11. Mt > 400GeV

  12. BG estimate

  13. systematic error (mEt) • mEt ------> • mEt*1.1

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