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Call for Acceptance challenge in W/Z+gamma analysis 2011

Zhijun Liang. Call for Acceptance challenge in W/Z+gamma analysis 2011. Introduction. Base line cuts are being setup. Wiki: First important task is to converge on Acceptance challenge on DATA/MC. Welcome more new people to join this analysis

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Call for Acceptance challenge in W/Z+gamma analysis 2011

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  1. Zhijun Liang Call for Acceptance challenge in W/Z+gamma analysis 2011

  2. Introduction • Base line cuts are being setup. • Wiki: • First important task is to converge on Acceptance challenge on DATA/MC. • Welcome more new people to join this analysis • Stephen Gibson (CERN), Elzbieta show interested in electron channel. • Marcos shows interested in muon channel. • Jianrong Deng shows interested in new channel Z(nunu)+gamma https://twiki.cern.ch/twiki/bin/view/AtlasProtected/BaslinecutsforWZgammaforEPS2011

  3. Event Selection

  4. Definition of Medium plus plus electron ID cut: https://svnweb.cern.ch/cern/wsvn/atlasoff/Reconstruction/egamma/egammaAnalysis/egammaAnalysisUtils/trunk/src/IsEMPlusPlusDefs.cxx

  5. Backup

  6. Data Cut Flow(177pb-1) 7

  7. Electron isolation(177pb-1) • WW analysis proposed is too hard for W/Z+gamma analysis • Not proposed to use isolation cut for electron before more understanding Z+gamma W+gamma

  8. Photon isolation(177pb-1) Blue curve : cut threshold used 2011 Red curve : proposed cut threshold W+gamma Z+gamma

  9. Photon pT distributionv W+gamma Z+gamma

  10. Radiation zero signal in W+gamma (177pb-1) Phys Rev Lett. 2008 Jun 20;100(24):241805 MT(e;nu;gamma)>100GeV No cuts on MT

  11. Two dimensional mass in Z(ee)+gamma(177pb-1) ISR FSR

  12. Summary • Based line cuts have been setup. • More people are joining this analysis . • First look into the W/Z+gamma candidates in data.

  13. Introduction TGC • W+ production ISR FSR s-channel u/t-channel • W measurement can probe WW triple gauge boson coupling (TGC) vertex •  from s-channel tends to have higher Pt • If presence of anomalous TGC from new physics, could enhance W production rate, particularly at the high  Pt region. • Analysis : select events with 1 isolated lepton (e,) , 1 isolated photon, large ETmiss • Main background: • W+jets (jet fakes as ) • Z+/jets (one lepton not Id, jet mis-Id as ) • ttbar production : ATLAS note on MC simulation of W production ATL-COM-PHYS-2010-296 14

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