strong electroweak symmetry breaking
DESCRIPTION
Strong Electroweak Symmetry Breaking. P.Krstonosic. Work done by : K. M önig, W.Killian, P.Krstonosic, M. Beyer, E. Schmidt, H. Schröder. Introduction. All possible weak boson scattering processes and sensitivity to the quartic anomalous couplings. deff. remark. Processes. - PowerPoint PPT PresentationTRANSCRIPT
LHC / ILC interplay 1
Strong Electroweak Symmetry Breaking
P.Krstonosic
Work done by : K. Mönig, W.Killian, P.Krstonosic, M. Beyer, E. Schmidt, H. Schröder
LHC / ILC interplay 2
Introduction Introduction
ee ee 4 5 6 7 10
WWWW WWWW + +
ZZWW + + + +
ZWZW ZWZW + + + +
ZZZZ ZZZZ + + + + +
• deff. remark
• All possible weak boson scattering processes and sensitivity to the quartic anomalous couplings
VVtrVVtrL 2
44
16
LHC / ILC interplay 3
ProcessesProcesses
Channel ee
qqqqWW eeee
qqqqZZ eeee
)(backgroundqqqq
qqqqeZWe
qqqqeeWWee
qqqqeeZZee
Xtt
qqqqWW
qqqqZZ
qqeWe
qqeeZee
Channel ee
qqqqWW eeee
qqqqeZWe ee
qqqqeeWWee
qqqqeeZZee
qqeWe ee
qqeeZee
Xttee
• Polarization 80%L for e- , 40%R for e+ for the beams
new
• Initial state radiation taken into account • single weak boson production as background • e- e- option considered
LHC / ILC interplay 4
• dependence of the total cross section on anomalous couplings( only one varied at a time) , and sensitivity of variables used in the fit ( total mass , absolute production and decay angle )
Sensitive variables Sensitive variables
LHC / ILC interplay 5
• Matrix element calculation with
lkji
MClkji
lkji
MClkji
DATAlkji NNNL )log(
jiijiiji EDCBAR 221),(
Simulation & Fit Simulation & Fit
• Full 1ab-1 event sample generated with
WHIZARD
• Hadronization with PYTHIA followed by SIMDET fast simulation
O'mega used for calculating
event weights in the form :
where R is the ratio of the matrix element to the SM one • Sensitivity is evaluated with Binned Likelihood Fit
DATAN SM sample, RNN DATAMC • After separate analysis for signal processes double counted events were assigned to one sample according to mass distance from M(V)+M(V) mass (V=W or Z)
LHC / ILC interplay 6
ISRISR
• example of ISR influence on result
( 800GeV W+W- )
Fit for only signal process
( no background)
LHC / ILC interplay 7
1TeV e+e-1TeV e+e-
• two parameter contours
( full line 70%Cl, dotted line 90%Cl)
LHC / ILC interplay 8
1TeV e+e-1TeV e+e-
• Results from 1ab-1 sample
• 2D case ( ) 01076 • and a full 5D fit
LHC / ILC interplay 9
1TeV e+ e-1TeV e+ e-
2D 1σ Error
1.41 1.38
1.16 1.09
4
5
5D 1σ Error
-2.72 2.37
-2.46 2.35
-3.93 5.53
-3.22 3.31
-5.55 4.55
4
5
6
7
10
• result for a 1ab-1 sample from e+e- processes at 1TeV
LHC / ILC interplay 10
1TeV e-e- and combined 1TeV e-e- and combined
•in red 1ab-1 e+e- & 350fb-1 e- e-
•in blue 2ab-1 e+e-
LHC / ILC interplay 11
standard modelbackground
Triple weak boson production Triple weak boson production
LHC / ILC interplay 12
• momenta• 3 particles x 4 components 12• energy momentum conservation - 4 • on-shell condition - 3• axial invariance (-dependence) - 2
– e.g. eZ plane, ZW plane
• total 3• kinematical variables:
M(ww), M(wz),θ(Z)
• spins, 2 d.o.f
Three-body kinematicsThree-body kinematics
LHC / ILC interplay 13
5
4
preliminary
Confidence level contoursConfidence level contours
70%Cl 90%Cl
WWZ 80% e-right, 60% e+left ZZZ unpolarized
WWZ 80% e-right polarizationWWZ unpolarized
LHC / ILC interplay 14
LHC / ILC interplay 15
LHC / ILC interplay 16
LHC / ILC interplay 17
LHC / ILC interplay 18
LHC / ILC interplay 19
Current status
LHC ILC
Analysis Analysis
Result ResultCombine
assumptions
assumptions
Contour Number
Number Contour X
LHC / ILC interplay 20
ILC
Examples
• Limited use .. Just to make a nice plot ( increase authors citation index ) .. No use for another study
LC-PHSM-2001-038
LHC / ILC interplay 21
What we want
LHC ILC
Analysis Analysis
Result
assumptions
LHC / ILC interplay 22
SummarySummary
• Major step towards a full and consistent set of limits done
• Triple weak boson production still to come
• Interpretation of results in specific physic scenarios in plan
• waiting for results of LHC analysis