CMS Masterclass. It’s the dawn of an exciting age of new discovery in particle physics! At CERN, the LHC and its experiments are underway. ATLAS and.

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Presentation transcript:

CMS Masterclass

It’s the dawn of an exciting age of new discovery in particle physics! At CERN, the LHC and its experiments are underway. ATLAS and CMS, the Compact Muon Solenoid, have been taking data. The first job is to confirm how the detector data corresponds to our understanding we call the Standard Model. Secondly, the task is to look for new phenomena. The LHC and New Physics

The LHC is buried ~100 m below the surface near the Swiss-French border. The LHC and New Physics where beams cross and some particles collide

Generic Design Cylinders wrapped around the beam pipe From inner to outer... Tracking Electromagnetic calorimeter Hadronic calorimeter Magnet* Muon chamber * location of magnet depends on specific detector design Detector Design

Detector Tracks Web Version

If each beam proton has energy 3.5 TeV.... The total collision energy is 2 x 3.5 TeV = 7 TeV. But each particle inside a proton shares only a portion. So a newly created particle’s mass must be smaller than the total energy. Energy & Particle Mass

Particle Decays The collisions create new particles that promptly decay. Decaying particles always produce lighter particles. Conservation laws allow us to see patterns in the decays. Try to name some of these conservation laws. film

Background Events Often, quarks are scattered by proton collisions. As they separate, the binding energy between them converts to sprays of new particles called jets. Electrons and muons may be included in jets. Software can filter out events with jets beyond our current interest.

W and Z Particles We are looking for the mediators of the weak interaction: electrically charged W + boson, the negative W - boson, the neutral Z boson. Unlike electromagnetic forces carried over long distances by massless photons, the weak force is carried by massive particles which restricts interactions to very tiny distances.

The W bosons are responsible for radioactivity by transforming a proton into a neutron, or the reverse. Z bosons are similarly exchanged but do not change electric charge. Collisions of sufficient energy can create W and Z or other particles. W and Z Particles

The W bosons are responsible for radioactivity by transforming a proton into a neutron, or the reverse. Z bosons are similarly exchanged but do not change electric charge. Collisions of sufficient energy can create W and Z or other particles. W and Z Particles

W and Z Decays Because W and Z only travel a tiny distance before decaying, CMS does not “see” W or Z bosons directly. CMS can detect : electrons muons CMS can infer: neutrinos from “missing energy”

iSpy-online

Use new data from the LHC in iSpy to test performance of CMS: Can we distinguish W from Z candidates? Today’s Task

Can we calculate the e/  ratio? Today’s Task

Can we calculate a W+/W- ratio for CMS? Today’s Task

Can we make mass plot of Z candidates? Today’s Task

Try some real events Open iSpy-online with: -Firefox ver 5 or greater -Chrome -Safari Open iSpy-dvd with: - Firefox ver 7 or greater

Recording event data

Histogram Review What do these histograms tell us? Turn data into a histogram: Spreadsheet Paper, chalkboard, or whiteboard

“Science is nothing but developed perception, interpreted intent, common sense rounded out and minutely articulated.” George Santayana Indirect observations and imaginative, critical, logical thinking can lead to reliable and valid inferences. Therefore: work together, think (sometimes outside the box), and be critical of each other’s results to figure out what is happening. Form teams of two. Each team analyzes 100 events. Talk with physicists about interpreting events. Pool results. Keep in Mind...

Additional Slides follow More

Masterclass 2012 Analysis PowerPoint Oct 2011 initial thoughts: update 2011 version where data and tasks have changed Nov 4 version 1: Changes from J/psi to W/Z, new histogram tools, new event display Nov 6 version 2: New task description, revise content for W/Z, simplify screens wherever possible, make headers more descriptive Nov 14 version 3: Ken’s edits. Jan 2012 version 4: further edits beta version