monte-carlo event generation for cepc 1 xin mo institute of high energy physics oct. 19, 2015...
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Monte-Carlo event generation for CEPC
1
Xin Mo Institute of High Energy Physics
Oct. 19, 2015
Monte-Carlo event generation for the CEPC
Outline
2Monte-Carlo event generation for
the CEPC
Introduction of CEPC generation work Basic information Higgs physics
NLO plans Electroweak & QCD Sample & validation
Basic information
3Monte-Carlo event generation for
the CEPC
Generator Matrix element: Whizard1.95 Shower & hadronization: Pythia6.4
Sample information:CM energy: 250GeVLuminosity: 5000fb-1 Polarization: unpolarizedISR: on Beamstrahlung: off
Workflow
4Monte-Carlo event generation for
the CEPC
Stdhep
5Monte-Carlo event generation for
the CEPC
Root
Marlin
Whizard, Pythia
Geant4, Mokka
Stdhep
Physics
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Signal part (Higgs)
SM Background
Monte-Carlo event generation for the CEPC
• 2 fermions
• 4 fermions
Higgs signal
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Vector boson fusion
Higgs-strahlung
Monte-Carlo event generation for the CEPC
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WW type
Classification of 4 fermions
Monte-Carlo event generation for the CEPC
ZZ type
Single W typeSingle Z type
e ee e
Single mixing
type
Mixing type
Summary table
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240GeV 250GeV
qq 54662 50216
μ+μ- 4685 4405
single Z 4538 4734
single W 5086 5144
W+W- 16004 15484
ZZ 1079 1033
ZH 203 212
W fusion 5.36 6.72
Z fusion 0.50 0.63
Cross sections [fb]
Monte-Carlo event generation for the CEPC
Number of events
10Monte-Carlo event generation for
the CEPC
NLO process
11Monte-Carlo event generation for
the CEPC
Leading order:
Next-to-Leading order:
Radiation Vertex correction Loop correction
Omega
Openloops
Interfaces
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OpenLoops for one-loop calculation; QCD correction
Powheg for shower matching
stdhep, lcio, lhe outputs
Monte-Carlo event generation for the CEPC
Cross sections
13Monte-Carlo event generation for
the CEPC
NLO LOuu 11121 10760dd 10227 9829cc 11068 10459ss 10100 9902bb 10237 9822
250GeV ISR & beamstrahlung
LO vs NLO
NLO event generation
14Monte-Carlo event generation for
the CEPC
Whizard
Pythia8LHEF
PowhegOpenloops
HepMC
Loop calculation
Matching
Hadronize
Validation
15Monte-Carlo event generation for
the CEPC
Monte-Carlo truth level
Fast simulation
Full simulation
Invariant mass check
16Monte-Carlo event generation for
the CEPC
Monte-Carlo truth LO vs NLO
Some plans for future
17Monte-Carlo event generation for
the CEPC
Validation for benchmark samples
A cross check Madgraph, Powheg
My Email address: [email protected]: Main building room B229 in IHEP
Thanks
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Thanks for attention!
Monte-Carlo event generation for the CEPC
Backup
19Monte-Carlo event generation for
the CEPC
Backup