1 W/Zstatus report Standard Model meeting, Jun 22th 2011 Al Goshaw (1) , Andrea Bocci (1) , Miaoyuan Liu (1) Zongjin Qian (1), Joshua Loyal (1) Song-Ming Wang (2) , Suen Hou (2) , Dong Liu (2) , Zhili Weng (2) Ming-hui Liu (3) Evgeny Soldatov (4) , Stephen Gibson (5) , Jianrong Deng (6) , Louis Helary (7) , Joao Barreiro Guimaraes Da Costa (8) Zhijun Liang (9), , Shih-Chieh hsu (10) , Kristian Gregersen (1) Duke University (2) Academia Sinica (3) University of Science and Technology of China (4) Moscow Engineering Physics Institute (5) CERN (6) Universities of California, Irvine (7) LAPP-Laboratoire d'Annecy-le-Vieux de Physique des Particules (8) Harvard University (9) University of Oxford (10) LBL
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Baseline simple method for ATGC limit setting• Plan to extract ATGC coupling limit• C_W(C_Z): calculate efficiency factor as of photon pT
– Efficiency Correction factor shows no dependence on ATGC coupling parameter.
Less than 5% difference between SM sample and ATGC sample One full simulation is enough to calculate C_W[pT], Don’t need full simulation for every ATGC grid points.
• A_W(A_Z):– Show strong dependence on ATGC parameter. Need to re-calculate for each ATGC points, need lots of generation
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Baseline simple method for ATGC limit setting(Minghui)
• σ[pT]: LO and NLO cross section for ATGC points. • Key point is to control k factor uncertainty in high pT
region
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ME re-weighting for ATGC study– A_W(A_Z) need lots of generation with normal method.– Kristian have tried ME weighting on this issue. – All contributoins 2->3 Wγ, 2->4 (Wγ+gluon jet ) 2->4
(Wγ+quark jet ) agrees well using re-weighting method– Discrepancy in Low M(photon;lepton) and low photon pT
region due to FSR contribution is included in Baur– Low Mass/PT are not used in TGC study any way
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M(γ;lepton)
pT(γ)
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• Two group meetings per week, have ramped up to full speed for EPS • Plan to write CONF note for EPS in two weeks. • 690pb-1 data(up to G5) data have been studied. • Lepton / Photon pT control plots have good agreement between
data/MC .• MET/Jets distributions are better understood, data driven BG shape
seems to work. • Angular distribution between lepton and photon have reasonable
agreement between data/MC, electron/muon channel. • Two methods for ATGC limit :
– Simple approach by breaking down observable( N_obs) into Acceptance , efficiency factor , cross section for ATGC 2D parameter grid
– ME re-weighting , try to generate the observable ( N_obs) for the whole 2D parameter grid using a full simulated ATGC sample in one go.