Search for RPV at the LHC with Razor Variables. Sung Bong Chun
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1 Search for RPV at the LHC with Razor Variables Sung Bong Chun
2 Presentation Outline Introduction Background: SUSY? RPV? LHC? Razor Variables? Target Event Event Selection Criteria Bin Shape Ratio Charge Shape Ratio Conclusion Backup 2
3 Introduction - Background SUSY? Relates one elementary particle to another differing only in ½ unit of spin, its superpartner. RPV? R = 2S + 3B + L R-parity = (-1) R = 1 for SM, -1 for SUSY particles RPV: Decay of a superpartner to SM particles 3
4 Introduction - Background LHC? pp collider at CERN currently operating at CM energy level 8 TeV CMS? Compact Muon Solenoid A detector surrounded by muon chambers at LHC or the group using it as a chief experimental device CMS data and MC samples 4
5 Introduction - Background Razor Variables Formulae: 5
6 Introduction Target Event* RPV decay superpartner Involves 2 light quarks, 4 b-quarks, 2 neutrinos, and 2 leptons upon pair production of gluinos. *C. Csáki, Y. Grossman, and B. Heidenreich, Minimal flavor violation supersymmetry: A natural theory for r-parity violation, Phys. Rev. D., vol. 85, p , May
7 Event Selection Criteria Target Event: Involves 2 light quarks, 4 b-quarks, 2 neutrinos, and 2 leptons upon pair production of gluinos. Goal: To suppress SM background as much as possible, Except for SM decays resembling target decay chain, such as pair production and tt T1 tttt 7
8 Event Selection Criteria Target Event: Involves 2 light quarks, 4 b-quarks, 2 neutrinos, and 2 leptons upon pair production of gluinos. Primitive Selection Criteria: 1 reconstructed vertex 4 PFJets with p T > 30GeV & η < 3 1 b-jet Two leptons (muon or electron) 8
9 Primitive Selection (MuMu Channel, M R ) 9
10 Primitive Selection (MuMu Channel, R 2 ) 10
11 Event Selection Criteria Further Restrictions: Baseline cut in M R >100 GeV and R 2 > 0.05 Angular separation of jets from leptons R ( ) 2 ( ) Tighter b-jet ID in leading 4 jets Z-mass window veto m Z 10GeV M m 10GeV ll Z Veto 11
12 Primitive Selection (MuMu Channel, M R ) 12
13 M R, R 2 cut (MuMu Channel, M R ) 13
14 ΔR Isolation - (MuMu Channel, M R ) 14
15 Tighter b-jet ID - (MuMu Channel, M R ) 15
16 Z-mass window - (MuMu Channel, M R ) 16
17 Event Selection Criteria Event Selection Criteria Developed: 1 reconstructed vertex 4 PFJets separated from leptons by ΔR > 0.5 with p T > 30GeV & η < 3 1 b-jet in leading 4 jets with tighter b-jet ID Two leptons (muon or electron) M R > 100GeV, R 2 > 0.05 Veto on M M GeV ll z 10 17
18 Bin Shape Ratio In the absence of signal event, higher bins in b-jet multiplicity are contributed chiefly through migration of lower bin events due to b-jet misidentification SM MC samples, there s no signal event Shape ratio independent of Razor variables (in principle) 18
19 Bin Shape Ratio (MuMu Channel, M R ) 19
20 Bin Shape Ratio (MuMu Channel, M R ) 20
21 Charge Shape Ratio If background is correctly characterized as pair production, lepton charges will be opposite Same charge (SS) events are chiefly migrated events from opposite charge (OS) events, due to lepton charge mistagging tt 21
22 SS/OS Ratio (MuMu Channel, M R ) SS/OS = 116/6580(~1.8%) SS/OS = 19/4934(~0.38%) SS/OS = 9/2350(~0.38%) SS/OS = 2/386(~0.52%) SS/OS ratio is ~4 times higher in 1b bin in MuMu box 22
23 SS/OS Ratio (MuMu Channel, R 2 ) SS/OS = 116/6580(~1.8%) SS/OS = 19/4934(~0.38%) SS/OS = 9/2350(~0.38%) SS/OS = 2/386(~0.52%) 23
24 Conclusion Event Selection Criteria Developed: 1 reconstructed vertex 4 PFJets separated from leptons by ΔR > 0.5 with p T > 30GeV & η < 3 1 b-jet in leading 4 jets with tighter b-jet ID Two leptons (muon or electron) M R > 100GeV, R 2 > 0.05 Veto on Mll M z 10GeV 24
25 Conclusion Bin Shape Ratio Excess in lower bin in b-jet multiplicity at lower p T Current b-tagging algorithm shows efficiency dependent on p T Charge Shape Ratio Observed overall SS/OS ratio greater than known lepton charge mistagging probabilities Dependence on Razor variables 25
26 End of Presentation questions? comments? or any blame? 26
27 Backup Slides Razor Variables Details on Selection Criteria Event Selection All three dilepton channels (MuEle, MuMu, EleEle) Bin Shape Ratio Charge Shape Ratio 27
28 1. Razor Variables Razor Variables Estimates CM rest mass of a reconstructed vertex when Missing Transverse Energy (MET) is involved. Razor frame is the longitudinally boosted frame in which two visible jets have equal magnitude of momenta. When more than two jets are visible in the final state, megajets are construced by summing all jets in hemispheres. The choice of partition is such that the sum of the rest mass of the two megajets are minimized 28
29 1. Razor Variables Razor Variables Formulae: 29
30 2. Details on Criteria Dilepton channel assignment 1 Muon, 1 Electron MuEle channel 2 Muon, no Electron MuMu channel 2 Electron, no Muon EleEle channel b-jet multiplicity bin determination Exclusive, hierarchical assignment of channels 2 loose, 1 medium, 1 tight b-jets bin# = 4 1 loose, 1 medium, 1 tight b-jets bin# = 3 1 medium, 1 tight b-jets bin# = 2 1 tight b-jets bin# =1 Exclusive, hierarchical assignment of bin#s 30
31 3. Event Selection Plots for All 3 Dilepton Channels 31
32 Primitive Selection (MuEle Channel, M R ) 32
33 Primitive Selection (MuEle Channel, R 2 ) 33
34 M R, R 2 cut (MuEle Channel, M R ) 34
35 M R, R 2 cut (MuEle Channel, R 2 ) 35
36 ΔR Isolation (MuEle Channel, M R ) 36
37 ΔR Isolation (MuEle Channel, R 2 ) 37
38 Tighter b-jet ID (MuEle Channel, M R ) 38
39 Tighter b-jet ID (MuEle Channel, R 2 ) 39
40 Z-mass window (MuEle Channel, M R ) 40
41 Z-mass window (MuEle Channel, R 2 ) 41
42 Primitive Selection (MuMu Channel, M R ) 42
43 Primitive Selection (MuMu Channel, R 2 ) 43
44 M R, R 2 cut (MuMu Channel, M R ) 44
45 M R, R 2 cut (MuMu Channel, R 2 ) 45
46 ΔR Isolation (MuMu Channel, M R ) 46
47 ΔR Isolation (MuMu Channel, R 2 ) 47
48 Tighter b-jet ID (MuMu Channel, M R ) 48
49 Tighter b-jet ID (MuMu Channel, R 2 ) 49
50 Z-mass window (MuMu Channel, M R ) 50
51 Z-mass window (MuMu Channel, R 2 ) 51
52 Primitive Selection (EleEle Channel, M R ) 52
53 Primitive Selection (EleEle Channel, R 2 ) 53
54 M R, R 2 cut (EleEle Channel, M R ) 54
55 M R, R 2 cut (EleEle Channel, R 2 ) 55
56 ΔR Isolation (EleEle Channel, M R ) 56
57 ΔR Isolation (EleEle Channel, R 2 ) 57
58 Tighter b-jet ID (EleEle Channel, M R ) 58
59 Tighter b-jet ID (EleEle Channel, R 2 ) 59
60 Z-mass window (EleEle Channel, M R ) 60
61 Z-mass window (EleEle Channel, R 2 ) 61
62 4. Bin Shape Ratio Plot (MuEle Channel) 62
63 4. Bin Shape Ratio Plot (MuMu Channel) 63
64 4. Bin Shape Ratio Plot (EleEle Channel) 64
65 5. SS/OS Ratio Plot (MuEle Channel, M R ) 65
66 5. SS/OS Ratio Plot (MuEle Channel, R 2 ) 66
67 5. SS/OS Ratio Plot (MuMu Channel, M R ) 67
68 5. SS/OS Ratio Plot (MuMu Channel, R 2 ) 68
69 5. SS/OS Ratio Plot (EleEle Channel, M R ) 69
70 5. SS/OS Ratio Plot (EleEle Channel, R 2 ) 70
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