Sekaric Jadranka

1
W - TGCs at a ?? collider at TESLA
K.Mönig, J.Sekaric DESY-Zeuthen
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Introduction
Dominating diagram for ?? ? WW-
TGC
Two couplings, ?? in dim-4 and ?? in dim-6
operators
Deviations from SM TGC values ? test of EW
theory, probe of some possible extensions ? new
physics beyond the SM
q
?
Ambiguities (cos?1,2,f1,2) ?
(-cos?1,2,f1,2p)
y
WBACKWARD
?1
x
x
?1
?2
z
?2
z
?
y
WFORWARD
q
?
3
Denner, Dittmaier, Schuster, hep-ph/9503442
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Denner, Dittmaier, Schuster, hep-ph/9503442
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Total Cross-Section - Whizard
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Differential Cross-Section
Deviation effects of WLLs in presence of
anomalous coupling
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Differential Cross-Section
Deviation effects of WLLs in presence of
anomalous coupling
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Analysis

• Signal (???WW) sample for JZ0(),2( ) (WHIZARD
  W. Kilian, 100 polarized photon beams, fixed
  beam energy)
• shad(0)35pb shad(2)31pb
• Response of a detector simulated with SIMDET V4
• Ws are reconstructed from hadronic final states
• MW(60-100) GeV ?nenflogt7º NENFLOgt10 NCTgt5
• pile-up (no track rejection) 1.8 ev/BX
• Estimated errors of measurement of ?? and ??
  parameters, obtained by binned Likelihood fit

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WFORWARD
MW1 GeV
WFORWARD
WBACKWARD
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(No Transcript)
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Monte Carlo Fit

• Each event described with 5 kinematical variables
  (sensitive to TGC)
• - W production angle, cos? of forward W-boson
• - W polar decay angles, cos?1,2 (sensitive to the
  different W helicity states) of higher energetic
  jet
• azimuthal decay angles, ?1,2 (sensitive to the
  interference between different W helicity states)
  of higher energetic jet

Matrix element calculations (WHIZARD-OMega) ?
weights to reweight SM events (???0, ???0) as
functions of anomalous TGC by
Weight/event R(???,???) 1 A??? B(???)2
C??? D(???)2 E ??? ???
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NDNSM- data sample (SM), NMC- Monte Carlo
sample NSMR(???,???), ?L error on luminosity
measurement
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2 Parameter Fit Results JZ0
3D ? 5D decreases the error in ?? in ??
significantly ! Pile-up distorts the
f-distribution ? increase of error in ?? for
20 ?? dependences on normalization
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2 Parameter Fit Results JZ2
3D ? 5D no influences in the error
estimations Pile-up distorts the f-distribution ?
increase of error in ?? for 25 ?? dependences
on normalization
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Conclusions

• JZ 0,2 are sensitive to the anomalous couplings
  ? to the possible scenarios of EWSB
• f distribution important for JZ0
• Pileup influences on ?? measurement (25)
• Promising channel for ?? - ?? measurements
• ???, ??? 10-4
• FUTURE
• to include the possible backgrounds, variable
  beam energy
• rejection of bad tracks from pileup

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Backup
Dominated WTT fraction
sWHIZARD scaled to the sFORMULA
WHIZARD ?? ? WW
ANALYTIC FORMULA ?? ? WW