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Monte-Carlo event generation for CEPC

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Presentation on theme: "Monte-Carlo event generation for CEPC"— Presentation transcript:

1 Monte-Carlo event generation for CEPC
Xin Mo Institute of High Energy Physics Nov. 20, 2015 Monte-Carlo event generation for the CEPC

2 Monte-Carlo event generation for the CEPC
Outline Introduction of CEPC generation work 250GeV 350GeV NLO plans Monte-Carlo event generation for the CEPC

3 Monte-Carlo event generation for the CEPC
Basic information Sample information: CM energy: 250GeV Luminosity: 5000fb-1 Polarization: unpolarized ISR: on Beamstrahlung: off Generator Matrix element: Whizard1.95 Shower & hadronization: Pythia6.4 Monte-Carlo event generation for the CEPC

4 Monte-Carlo event generation for the CEPC
Workflow Monte-Carlo event generation for the CEPC

5 Monte-Carlo event generation for the CEPC
Stdhep Root Marlin Whizard, Pythia Geant4, Mokka Stdhep Monte-Carlo event generation for the CEPC

6 Monte-Carlo event generation for the CEPC
Physics Signal part (Higgs) SM Background 2 fermions 4 fermions 6 fermions(350GeV) Monte-Carlo event generation for the CEPC

7 Monte-Carlo event generation for the CEPC
Higgs signal Higgs-strahlung Vector boson fusion Monte-Carlo event generation for the CEPC

8 Classification of 4 fermions
WW type Mixing type ZZ type Single W type Single mixing type Single Z type Monte-Carlo event generation for the CEPC

9 Workshop on Monti-Carlo for CEPC CFHEP
Cuts Default cuts Applied on the invariant mass of colored or charged particle pairs, on the energy of emitted photons or gluons, and on the momentum transfer to exchanged photons or gluons. M ≥10GeV Workshop on Monti-Carlo for CEPC CFHEP

10 Monte-Carlo event generation for the CEPC
Summary table Cross sections [fb] 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 Monte-Carlo event generation for the CEPC

11 Monte-Carlo event generation for the CEPC
Number of events Monte-Carlo event generation for the CEPC

12 Monte-Carlo event generation for the CEPC
350GeV sample Sample information e+e-  ZH; SM backgrounds; ttbar; 350GeV; 1000fb-1; ISR on; format: stdhep Topology Monte-Carlo event generation for the CEPC

13 Monte-Carlo event generation for the CEPC
6fermions ttbar consisting of down type quarks and two virtual W bosons tt_dtdtutdtutdt, tt_dtdtutdtlv, tt_dtdtlvlv ZWW consisting of one virtual Z(excluding down types) and two virtual W bosons named with prefix zww, 9 sub-processes ZZZ consisting of three virtual Z bosons(excluding up-down pairs) named with prefix zzz, 12 sub-processes Monte-Carlo event generation for the CEPC

14 Cross sections(6fermions)
Process σ(fb-1) tt_dtdtlvlv 11.656 tt_dtdtutdtlv 45.566 tt_dtdtutdtutdt 43.106 zww 10-1~1 zzz ~10-2 Monte-Carlo event generation for the CEPC

15 Monte-Carlo event generation for the CEPC
NLO process Leading order: Omega Next-to-Leading order: Openloops Radiation Vertex correction Loop correction Monte-Carlo event generation for the CEPC

16 Monte-Carlo event generation for the CEPC
NLO event generation Openloops Matching Whizard Powheg Loop calculation HepMC LHEF Pythia8 Hadronize Monte-Carlo event generation for the CEPC

17 Monte-Carlo event generation for the CEPC
Cross sections 250GeV ISR & beamstrahlung NLO LO uu 11121 10760 dd 10227 9829 cc 11068 10459 ss 10100 9902 bb 10237 9822 LO vs NLO Monte-Carlo event generation for the CEPC

18 Monte-Carlo event generation for the CEPC
Validation Monte-Carlo truth level Fast simulation Full simulation Monte-Carlo event generation for the CEPC

19 Monte-Carlo event generation for the CEPC
Summary Mass production 250GeV signal and SM backgrounds 350GeV 6fermions backgrounds NLO Beginning for NLO study Validation and cross check Monte-Carlo event generation for the CEPC

20 Monte-Carlo event generation for the CEPC
Thanks Thanks for attention! Monte-Carlo event generation for the CEPC

21 Monte-Carlo event generation for the CEPC
Backup Backup Monte-Carlo event generation for the CEPC

22 Monte-Carlo event generation for the CEPC
Interfaces OpenLoops for one-loop calculation; QCD correction Powheg for shower matching stdhep, lcio, lhe outputs Monte-Carlo event generation for the CEPC


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