1. Gluon Gluon to jpsi jpsi
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2. Typical Feynman diagrams of pair production in p p collision at leading order in color-singlet scheme
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3. Typical Feynman diagrams of pair production in p p collision at leading order in color-singlet scheme
The generator is on the basis of FDC system(arXiv: hep-ph/ ), and the generator could generate events in color-singlet and –octet scheme, respectively.
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4. Comparison between theoretical cross-section calculations and the results of my generator (see arxiv v3 for mathematica results)
Down limit
(2jpsi)
( )
Theoretical calculations in Mathematica
Generator results
Single-color
Octet-color
5GeV
1.08pb
1.15pb
1.329pb
1.492pb
6GeV
0.37pb
0.74pb
0.402pb
0.908pb
7GeV
0.14pb
0.49pb
0.144pb
0.583pb
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5. Signals
If set the down limit of Pt of double jpsi at 5GeV，because if Pt of jpsi was lower than 5GeV, the c quark fragmentation is not appropriate.
cross-section of single-color model is 1.125pb;
cross-section of octet-color model is 1.131pb.
(10 TeV)
This result has included branching ratio of jpsi to mumu:5.6% for each jpsi
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6. CMSSW_3_1_1, 10 TeV Model Pre-selection Color-singlet (100,000 events)
93030
Color-octet (100,000 events)
88249
Pre-selection: dimuon with different charge, Pt >0.7, |eta|<2.5, invariant mass (3.0, 3.2)
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7. Recomuon Number (trackermuon)
Octet
Singlet
Singlet
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8. Inva_mass fitting 2 Cut the first di-muon mass: 2.9-3.3;
Two vertex fitting, chi-square<100.
Fitting area
6566
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9. (pt<3&&fabs(eta)<1)||(pt<3-(1. 5/0. 2
(pt<3&&fabs(eta)<1)||(pt<3-(1.5/0.2*(fabs(eta)-1))&&fabs(eta)<1.2&&fabs(eta)>1)
||(pt<1.5-(0.8/1.3*(fabs(eta)-1.2))&&fabs(eta)<2.5&&fabs(eta)>1.2))
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10. Muon +track Cut the first di-muon mass: 2.9-3.3;
Two vertex fitting, chi-square<100.
Fitting area
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11. Octet 2D_pt Bin:0-4,4-7,7-10,10-15,15-25 CMS Meeting 8-20
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12. General Efficiency
Trig is efficiency of trigger path to select events.
Final-parti-reco is efficiency of final particles like muon, photon, jet, etc.
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