12/14/201211/30/2012

Lailin Xu 1

mono-Z: MC comparison

Tiesheng Dai1), Ed. Diehl1), Dan Levin1), Jianbei Liu1),Shawn McKee1), Lailin Xu1,2), Bing Zhou1) , Zhengguo Zhao2)

1)The Univ. of Michigan2)The Univ. of Sci. and Tech. of China

12/14/201211/30/2012

Lailin Xu 2

MC samples

• mono-Z samples:– mc12_8TeV.158938.MadgraphPythia8_AU2MSTW2008LO_WimpPair_D1_DM1

0.merge.NTUP_SMWZ.e1629_a159_a171_r3549_p1067/– mc12_8TeV.158942.MadgraphPythia8_AU2MSTW2008LO_WimpPair_D5_DM1

0.merge.NTUP_SMWZ.e1629_a159_a171_r3549_p1067/– mc12_8TeV.158951.MadgraphPythia8_AU2MSTW2008LO_WimpPair_ZZxx_DM

50.merge.NTUP_SMWZ.e1629_a159_a171_r3549_p1067/– mc12_8TeV.158946.MadgraphPythia8_AU2MSTW2008LO_WimpPair_D9_DM1

0.merge.NTUP_SMWZ.e1629_a159_a171_r3549_p1067/

• SM ZZ samples– mc12_8TeV.126949.PowhegPythia8_AU2CT10_ZZllnunu_ee_mll4.merge.NTUP_SM

WZ.e1280_s1469_s1470_r3752_r3549_p1067– mc12_8TeV.126950.PowhegPythia8_AU2CT10_ZZllnunu_mm_mll4.merge.NTUP_S

MWZ.e1280_s1469_s1470_r3542_r3549_p1067

Effective Theory of DM

12/14/201211/30/2012

Lailin Xu 3

12/14/201211/30/2012

Lailin Xu 4

MC truth event selections

• Select 2l2n events at MC truth level: – mono-Z: qq->Z, Z->ee/mm/tt– SM ZZ: qq->ZZ->ll

• Z mass line shape with following filter:– D1,D5,D9: |mll - mZ| < 37 GeV (Madgraph, ATLFAST II)– D10: zero width approximation (Madgraph, ATLFAST II)– SM ZZ: mll > 4 GeV (Powheg+pythia8)

• Use a preselection for the kinematics comparison– |mll-mZ| < 25 GeV

12/14/201211/30/2012

Lailin Xu 5

Leading lepton pT/Eta

12/14/201211/30/2012

Lailin Xu 6

Dilepton pT/mass

12/14/201211/30/2012

Lailin Xu 7

MET/Aixal-MET

12/14/201211/30/2012

Lailin Xu 8

Jet multiplicity

12/14/201211/30/2012

Lailin Xu 9

Summary

• Kinematics comparison among different DM model operators with the SM ZZ background

• Discussion:– Only ALTFAST (II) simulations, should we produce full

simulation samples ?– Not enougth statisics: D1/D5/D9: 10k; D10: 5K

12/14/201211/30/2012

Lailin Xu 10

12/14/201211/30/2012

Lailin Xu 11

12/14/201211/30/2012

Lailin Xu 12

12/14/201211/30/2012

Lailin Xu 13

12/14/201211/30/2012

Lailin Xu 14

12/14/201211/30/2012

Lailin Xu 15

12/14/201211/30/2012

Lailin Xu 16