(Di-) Boson studies at ATLAS

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Presentation transcript:

(Di-) Boson studies at ATLAS A concrete collaborating project between CPPM and USTC Yanwen Liu USTC and CPPM

Outline Electroweak boson production at LHC From Standard Candle to Physics ATLAS electron identification Outlook in place of Conclusion W,Z WW For each 100pb-1 , 1M W->eν, 200 pure leptonic WW! (7 TeV PP) concentrate on ee channel now.

WW Non-zero gauge coupling among bosons

Are you so sure? P-value = 7% arXiv:0912.4500 CDF 3.1 fb-1 Leading

Higgs, of course! Chinese Scholarship Council Let’s check it out at ATLAS Shu LI (thesis student) CPPM/USTC joint-PhD + other PhD students Supporters: CPPM F. Hubaut, P. Pralavorio, E. Monnier USTC Y.Liu, Z. Zhao And Chinese Scholarship Council Combined search for gg->H->WW Bins of each analysis sorted by s/b. CDF Note 10101, D0 Note 6039

CSC results CERN-OPEN-2008-020 Not assessed: W/Z+jets Multi-jets background Two isolated leptons, pT>20 GeV, |η|<2.5 Veto events with a jet of pT>20 GeV, |η|<3. MET > 50 GeV Veto on events with a Z peak. Angular cuts among leptons and MET (different for WW cross section measurement and anomalous coupling sensitivity) . Need re-optimize for 7 TeV 200 pure leptonic WW events in each 100pb-1

Detector for electrons gluon jets electrons from B

Good resolution, good s/b ATLAS test beam Electron beam Efficiencies for electrons from Z: Loose = 88% Tight(isol) = 64% Medium = 77% Tight(TRT) = 62%

Stable operation The “readiness” paper: arXiv:0912.2642 Submitted to EJPC Stable operation Constantly monitored : LAr purity, temperature, HV, pedestals and gains

Electrons in ‘Standard Candles’ 14 TeV MC (performance book) For 7 TeV, expect 1M electrons per 100pb-1 In progress: preparation for the first W,Z observation with 7 TeV data.

“Electrons” in cosmic muons Electron candidates in cosmic-rays Checks at electrons variables Made sure most are truly muons, saw δ-rays >= 2 ID tracks

Electrons in 900 GeV data

Electrons in 900 GeV data

ID material from conversions Brem in TRT SCT 1

One 7 TeV event

Another 7 TeV event

Outlook in place of Conclusion ATLAS is an excellent detector Electron identification promising Exercised whenever we had a chance Looking forward to W/Z Standard Candles Looking forward to exciting physics!