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Electroweak Electroweak UnificationUnification

ByBy

Mark Hilton, Mark Hilton, Yee-Ting LiYee-Ting Li, John Loizides,, John Loizides,

Jayesh Ramanlal, Mo Man Yue, Khadija Jayesh Ramanlal, Mo Man Yue, Khadija MuhiddinMuhiddin

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IntroductionIntroduction

Understanding of TheoryUnderstanding of Theory Analysis of DataAnalysis of Data Event DisplayEvent Display WebpageWebpage

Outline of ProjectOutline of Project

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HERAHERA Hadron-Lepton AcceleratorHadron-Lepton Accelerator ZEUS DetectorZEUS Detector Use of ZEUS in our ProjectUse of ZEUS in our Project

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Deep Inelastic ScatteringDeep Inelastic Scattering

IntroductionIntroduction Neutral and Charged Current EventsNeutral and Charged Current Events

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Neutral Current EventsNeutral Current Events

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Charged Current EventsCharged Current Events

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Background Events 1Background Events 1

IntroductionIntroduction TypesTypes

P-gasP-gas Photo-productionPhoto-production MuonMuon Fake ElectronsFake Electrons

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Photo-productionPhoto-production

P-GasP-Gas

Background Events 2Background Events 2

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Background Events 3Background Events 3 MuonMuon

Fake ElectronsFake Electrons

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ThresholdsThresholds

E’e >25GeVE’e >25GeV Missing transverse momentum < Missing transverse momentum <

2 2 Et Et 38GeV< 38GeV< <65GeV <65GeV -50cm < Zvtx < 50cm-50cm < Zvtx < 50cm Xvtx + Yvtx < 8.5cmXvtx + Yvtx < 8.5cm ye <0.95 ye <0.95 0.7 < Q2e /Q2DA <1.20.7 < Q2e /Q2DA <1.2 Q2DA >400GeVQ2DA >400GeV Number of muon tracks < 3Number of muon tracks < 3

Neutral Current EventsNeutral Current Events Charged Current EventsCharged Current Events

• Missing transverse momentum > Missing transverse momentum > 12GeV12GeV

• MMissing transverse momentum > issing transverse momentum > 2 2 EtEt

<38GeV<38GeV

• -50cm < Zvtx < 50cm-50cm < Zvtx < 50cm

• X vtx + Yvtx < 8.5cmX vtx + Yvtx < 8.5cm

• Q2JB >400GeVQ2JB >400GeV

• Number of muon tracks < 3Number of muon tracks < 3

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Electroweak Unification 1Electroweak Unification 1

IntroductionIntroduction Differential Cross Sections (DCS)Differential Cross Sections (DCS)

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Electroweak Unification 2Electroweak Unification 2

Detection of NC/CC EventsDetection of NC/CC Events Collisions of lepton-protonsCollisions of lepton-protons All variables stored in ‘ntuple’All variables stored in ‘ntuple’ ThresholdsThresholds

Relation of Events with Differential Cross SectionRelation of Events with Differential Cross Section

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1

dQA

C

L

dN

dQ

d rad

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Electroweak Unification 3Electroweak Unification 3

Project ResultsProject Results

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Event DisplayEvent Display

IntroductionIntroduction Graphical interpretation of collisionGraphical interpretation of collision Aid to collaborationAid to collaboration

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WebpageWebpage

AudienceAudience History of the Web - CERNHistory of the Web - CERN Public Project Website (www.vhp.org.uk)Public Project Website (www.vhp.org.uk)

LayoutLayout FeaturesFeatures NavigationNavigation ContentContent

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SummarySummary

AchievementsAchievements

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Questions & Questions & CommentsComments