h y p a t i a hy brid p upil’s a nalysis t ool for i nteractions in a tlas
DESCRIPTION
H Y P A T I A HY brid P upil’s A nalysis T ool for I nteractions in A tlas. http://hypatia.phys.uoa.gr / applet. HYPATIA of Alexandria. First woman mathematician Alexandria, Egypt ( 370-418 A . D . ). Proton – proton Collisions. Beam energy: 3.5, 4 TeV - PowerPoint PPT PresentationTRANSCRIPT
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H Y P A T I A
HYbrid Pupil’s Analysis Tool for Interactions in Atlas
http://hypatia.phys.uoa.gr/applet
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HYPATIA of Alexandria
•First woman mathematician•Alexandria, Egypt (370-418 A.D.)
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Proton – proton Collisions
Beam energy: 3.5, 4 TeV2 x 3.5 TeV = 7 or 8 TeVSome of the particles
produced are unstable and decay instantly
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ATLAS•Particle tracks appear as lines on the detectors•The length of each track is determined by particle type•Each particle leaves a trace only on specific detectors according to its type
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HY.P.A.T.I.A.
CanvasDisplays events in various forms depending on particle type and user preference. Can do zoom, pan, rotate, pick track etc
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HY.P.A.T.I.A.
Track MomentaDisplays the quantities that describe each track (type, momentum, charge, φ, θ)
HistogramsCreated automatically from the tracks of the invariant mass table
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HY.P.A.T.I.A.
Invariant MassMain event analysis window.Displays the user selected tracks from various events. Calculates invariant masses.Creates Histograms.
Η → 4ℓ
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Laboratory Exercise
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Laboratory ExerciseDetection and mass calculation of particles – Real EventsKnown particles:
Z → μ- + μ+ Z → e- + e+
2 tracks, opposite charge, isolated Invariant mass 91,2 GeV Small missing energy ETMiss
J/ψ → μ- + μ+ J/ψ → e- + e+
2 tracks, opposite charge, not diametrical Invariant mass 3 GeV Small missing energy ETMiss<15GeV
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Laboratory ExerciseDetection and mass calculation of particles – Real EventsKnown particles:
Υ → μ- + μ+ Υ → e- + e+
2 tracks, opposite charge Invariant mass 9,5 GeV Small missing energy ETMiss
Background events Usually one lepton (W boson decay) Leptons from quark decays are in jets (non-isolated
tracks) Cosmic rays : diametrical tracks on both detector views Large missing energy ETMiss (because of neutrinos)
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Laboratory ExerciseIdentification of electrons - muons e : charged particles, usually isolated that leave a trace in
the E/M calorimeter μ : charged particles that leave a trace in the muon
chambers
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Laboratory ExerciseDetection and mass calculation of particles- Histogram
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Laboratory ExerciseDetection and mass calculation of particles –Dimuon spectrum
+???
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Discover Higgs!
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Laboratory Exercise“Discover Higgs”H → 2 Z → 4lZ → e- + e+ ή Z → μ- + μ+
H 2 e- + 2 e+
H 2 μ- + 2 μ+
Η e- + e+ + μ- + μ+
Isolated tracks 6 GeV pT Cut Invariant mass of 4 tracks (Z boson pairs)
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Laboratory Exercise“Discover Higgs”H → 2 γ
• Photons do not carry charge• Photons have 0 mass• Photons leave NO tracks• Photons deposit energy on the
E/M Calorimeter• Converted photons
γ e- e+ (Invariant mass ≈ 0)
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Track examples
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Laboratory Exercise
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Recap
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So, what are we looking for?? Z → e- + e+ or Z → μ- + μ+ 91,2 GeV Y → e- + e+ or Y → μ- + μ+ 9,5 GeV J/ψ → e- + e+ or J/ψ → μ- + μ+ 3,1 GeV Unknown particles→ e- + e+ or → μ- + μ+
H → 2 Z → 4l (very few events) ? GeV
For all the above enter tracks which have sum of charge=0
H → 2 γ ? GeV
Background