1 Simulation study of e + e - W H + W H - Introduction Observable to be measured Analysis framework Event selection Results Rei Sasaki (Tohoku Univers ity) with LCWS08 at Chicago 2008/11/18 <Theorist> S.Matsumoto (Toyama Univ.) M.Asano (ICRR) <Experimentalist> K.Fuji (KEK) Y.Takubo (Tohoku Univ.) T.Kusano (Tohoku Univ.)
LCWS08 at Chicago 2008/11/18. Simulation study of e + e - W H + W H -. Introduction Observable to be measured Analysis framework Event selection Results. Rei Sasaki (Tohoku University) with. K.Fuji (KEK) Y.Takubo (Tohoku Univ.) T.Kusano (Tohoku Univ.). - PowerPoint PPT Presentation
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Simulation study of e+e-WH+WH
-
Introduction Observable to be measured Analysis framework Event selection Results
AAHH and WWHH±± can be searched by ILC (1TeV1TeV).
<Mass>
f : Breaking scalemh : Higgs mass
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Introduction
ee++ee-- W WHH++WWHH
-- is the best one to investigate the property of the dark matter predicted in the model.
mass spinWH 368.2(GeV) 1AH 81.85(GeV) 1
<Property> <Mass spectrum>
SM LHT
<Mode>e+e- WH
+WH-
(WH±AHW± with 100% ratio)
- Large cross section- Dark matter (AH) appears
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Observable to be measured1) Energy edges of W± lead to masses of WH
± and AH bosons
2) Production angle of WH±
lead to spin of WH± boson
3) Angular distribution of reconstructed jets from associated W± boson decays lead to helicity of W± boson
e-
e+WH
+
WH-
W±j
j
e-
e+WH
+W+
AH
WH-
AH
W-
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Analysis framework<Event generation>
MadGraph : for LHT processPhyssim : for Standard Model process - helicity amplitude calculation - gauge boson polarization effect - phase space integration and generation of parton 4-momenta<Hadronization>
<Detector simulation>
PYTHIA - parton showering and hadronization
JSFQuickSimulator - create vertex-detector hits - smear charged-track parameters in central tracker - simulate calorimeter signals as from individual segments