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Published byMaximillian Clement Parrish Modified over 9 years ago
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Caroline Fletcher Advisor: Dan Karmgard
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Astrophysics Compact Muon Solenoid
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Observational Astronomy Telescope alignment Celestron 8-inch. Image taking SBIG ST-8XECCD camera and attached it to the Celestron CPC800 11-inch Schmidt-Cassegrain telescope.
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Cartoon Muon Solenoid Program : Components: Image This is a three dimensional image of the Compact Muon Solenoid (CMS) detector. Can rotate and view every inch of the detector while studying the variety of events. CMS
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Graphic Controls Controls the transparency of each detector part. Detectable Path This is the actual physics. (The vector sum of Transverse momentum in the x-y plane) CMS
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Event type EM: Electrons/Positrons/Photons These stop in the Ecal HD: Charged pions/neutral kaons These stop in the Hcal Mu: Muons/Neutrions These travel through the entire detector. Charge Determines the shape of the track. 0 = straight line -1/+1 bend in the opposite direction. P x /P y /P z The charge determines the direction and the momentum determines the amount of curvature. This will only occur in the x-y plane due to the solenoid being oriented along the z-axis. Vertex Where the collision occurred (0 cm) CMS
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Underlying Event This allows you to see EVERYTHING!! (HELP ME) Avg Bkg The average background value is used as the average of a flat distribution. Lower number = less realistic P t Cut This filter allows you to concentrate on the transverse momentum. Higher momentum = less tracks Track Number assigned to each track. Color This enables you to “pin-point” the exact track you wish to study when concentrating on momentum. Help and Home Self explanatory! CMS
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Color Code Since tracks are generated without your interaction, colors have been assigned to particle type Electrons = Green Photons = Light Blue Hadrons = Yellow Muons = Red Neutrinos = Dark Blue CMS
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Track information Hold shift and left mouse together, and a box will appear. p z = Momentum on the z-axis p T = Transverse Momentum φ = Angular displacement ɳ = Efficiency VTX = Vertex M = Mass E = Energy ID = Particle CMS
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Hard Quantum Chromodynamics (QCD) Hadron-Hadron collisions and predicted by the perturbation theory. Fragment into jets. pT Cut (MeV) = 0 pT Cut (GeV) = 5
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Top Quark The heaviest of all six which makes it very short lived. The been has to be at least 7 TeV. Decay into W-boson and a bottom quark. pT Cut (GeV) = 5 pT Cut (MeV) = 0
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LeptoQuark Hypothetical Particle (Do I need to say more?) pp collisions with energies around 7 TeV. Being heavy, these particles decay very quickly into one of three generations. pT Cut (GeV) = 5 pT Cut (MeV) = 0
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Standard Model (SM) Higgs This particle has no spin, electric charge, or color change with mass around 125 GeV/c 2. Unstable = Quick Decay Many believe that this particle explains why some particles are massive and others mass-less. Most probable decays: b-quark-b-antiquark, charmed quark-charmed antiquark, or tau-anti-tau. Other possibilities: WW and ZZ, although these particles will also undergo another stage of decay (lepton-anti-lepton, neutron-anti- neutron, quark-anti-quark)
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pT Cut (MeV) = 0 pT Cut (GeV) = 5
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Prompt Photons pp collisions and are detected in the eCal. Because they do not fragment into jets, we can achieve a more accurate picture of these photons. Two processes Low p T The quark gluon Compton Scattering process dominates. High p T Quark anti-quark annihilation dominates. As the curves steepness decreases, the p T will increases.
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pT Cut (MeV) = 0 pT Cut (GeV) = 5
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Weak Boson Exchange W and Z particles that are the carrier of the electromagnetic force. We only see the decay particles! There are 24 possibilities with only 21 that are visible. Most common: quark-antiquark pair which you can see as jets.
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pT Cut (MeV) = 0 pT Cut (GeV) = 5
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pT Cut (MeV) = 0 pT Cut (GeV) = 5
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pT Cut (MeV) = 0 pT Cut (GeV) = 5
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pT Cut (MeV) = 0 pT Cut (GeV) = 5
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CMS public data (The REAL thing!!!!) How to choose your data set Select data file: Choose which type of event you would like to research. Event: Public released data usually in sequential order. Muon Filters: Tracker is the inner most part of the detector, and the muons that are detected in this section produce ambiguous results in all other parts of the detector. Stand Alone: This type of muon is detected in the spectrometer and has no detection in the tracker. These muons are more than likely produced from a decay and are also accompanied with a jet. Global: This type of muon is measured in all sections of the detector.
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Jet cones: The cones indicate that there are many particles traveling together in the same direction away from the same source. This is also a sign that a quark collision may have just occurred. You may check this box for on/off view. Jet Hadrons: Quarks or Gluons have been knocked out of the proton.
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CMS
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