W - TGCs at a γγ – collider at TESLA K.Mönig, J.Sekaric DESY-Zeuthen ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Two couplings, κγ in dim-4 and λγ in dim-6 operators Introduction Dominating diagram for γγ W+W- TGC Two couplings, κγ in dim-4 and λγ 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 : (cosθ1,2,φ1,2) ↔ (-cosθ1,2,φ1,2+π) WBACKWARD y 1 x 2 x 1 z 2 z y WFORWARD q ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Denner, Dittmaier, Schuster, hep-ph/9503442 ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Denner, Dittmaier, Schuster, hep-ph/9503442 ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Total Cross-Section - Whizard ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Deviation effects of WLL’s in presence of anomalous coupling Differential Cross-Section Deviation effects of WLL’s in presence of anomalous coupling ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Deviation effects of WLL’s in presence of anomalous coupling Differential Cross-Section Deviation effects of WLL’s in presence of anomalous coupling ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Analysis Signal (γγ→WW) sample for JZ=0(±±),2(± ) (WHIZARD – W. Kilian, 100% polarized photon beams, fixed beam energy) σhad(0)=35pb; σhad(2)=31pb Response of a detector simulated with SIMDET V4 Ws are reconstructed from hadronic final states MW=(60-100) GeV; θnenflo>7º; NENFLO>10; NCT>5; pile-up (no track rejection) 1.8 ev/BX Estimated errors of measurement of and parameters, obtained by binned Likelihood fit ± ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
WFORWARD WFORWARD WBACKWARD MW1 [GeV] WFORWARD WBACKWARD ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Monte Carlo Fit Each event described with 5 kinematical variables (sensitive to TGC) : - W production angle, cosθ of forward W-boson - W polar decay angles, cosθ1,2 (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-O’Mega) weights to reweight SM events (Δκγ=0, Δλγ=0) as functions of anomalous TGC by Weight/event: R(,) = 1 + A· + B·()2 + C· + D·()2 + E · ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
ND=NSM- data sample (SM), NMC- Monte Carlo sample [NSM·R(,)], L – error on luminosity measurement ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Likelihood (normalized) DETECTOR LEVEL MW1,2=(60 – 100) GeV 2 Parameter Fit Results – JZ=0 JZ=0 3D/5D (φ=0-2π) ECM = 400 GeV, L = 110 fb-1 , FBE Likelihood (normalized) DETECTOR LEVEL MW1,2=(60 – 100) GeV L 1% 0.1% accurate ·10-4/10-4 26.0/14.4 6.2/5.4 3.8/2.6 ·10-4/10-4 14.4/3.0 13.7/3.0 ·10-4 +pileup 15.4 5.4 2.6 ·10-4 +pileup 3.8 3D 5D decreases the error in ; in significantly ! Pile-up distorts the φ-distribution increase of error in for ~20% dependences on normalization ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Likelihood (normalized) DETECTOR LEVEL MW1,2=(60 – 100) GeV 2 Parameter Fit Results – JZ=2 JZ=2 3D/5D (φ=0-2π) ECM = 400 GeV, L = 110 fb-1 , FBE Likelihood (normalized) DETECTOR LEVEL MW1,2=(60 – 100) GeV L 1% 0.1% accurate ·10-4/10-4 29.0/19.9 6.2/6.2 3.9/3.8 ·10-4/10-4 1.8/1.5 1.6/1.5 ·10-4 +pileup 23.2 6.3 3.9 ·10-4 +pileup 2.0 3D 5D no influences in the error estimations Pile-up distorts the φ-distribution increase of error in for ~25% dependences on normalization ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
Conclusions JZ =0,2 are sensitive to the anomalous couplings to the possible scenarios of EWSB φ distribution important for JZ=0 Pileup influences on λγ measurement (~25%) Promising channel for κγ - λγ measurements Δκγ, Δλγ ~ 10-4 FUTURE to include the possible backgrounds, variable beam energy rejection of bad tracks from pileup ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen
ANALYTIC FORMULA γγ WW Backup Dominated WTT fraction σWHIZARD scaled to the σFORMULA WHIZARD γγ WW ANALYTIC FORMULA γγ WW ECFA, Sept. 04, UK Sekaric Jadranka DESY-Zeuthen