A few ways to bring particles into your classes and to your students

  • Published on

  • View

  • Download


A few ways to bring particles into your classes and to your students. With thanks to Ken Cecire from QuarkNet . QuarkNet.fnal.gov has been around since some time. About this breakout session. Why : you are the best ambassadors of particle physics, as you knead the dough of the future. - PowerPoint PPT Presentation


<p>PowerPoint Presentation</p> <p>A few ways to bring particles into your classes and to your studentsWith thanks to Ken Cecire from QuarkNet.April 2014a.david@cern.ch - #CERNPhil20141QuarkNet.fnal.gov has been around since some timeApril 2014a.david@cern.ch - #CERNPhil20142</p> <p>About this breakout sessionWhy: you are the best ambassadors of particle physics, as you knead the dough of the future.What: introduce you to particle physics resources and activities that you can do with your students.How: go through two QuarkNet activities.Introduction 10Quark puzzle activity 40Plotting LHC discovery activity 40Perchance chat with Ken.April 2014a.david@cern.ch - #CERNPhil20143ResourcesThe International Particle Physics Outreach Group (IPPOG): http://ippog.web.cern.ch/QuarkNet: http://quarknet.fnal.gov/</p> <p>April 2014a.david@cern.ch - #CERNPhil20144What we will look at todayQuark Puzzlestudents fit quark "pieces" togetheruse to learn about quark combination rules to form mesons and baryons with electrical charge, color charge, matter-antimaterpuzzle "workbench" and pieces (must be cut out) at http://leptoquark.hep.nd.edu/~kcecire/mclib/files2012/QW_puzzle.pdf instructions at http://leptoquark.hep.nd.edu/~kcecire/mclib/files2012/Quark_Instructions.pdf Plotting LHC Discoverystudents construct J/Psi mass plot from data, identify peak and backgroundstudents then examine a discovery plot from LHC (e.g. 4 July 2012) and pick out similar featuresdescription for students at http://quarknet.us/library/upload/7/73/Discoveryplots_student.pdfdescription for facilitator at http://quarknet.us/library/upload/0/0e/Discoveryplots_tchr.pdf</p> <p>April 2014a.david@cern.ch - #CERNPhil20145Quark puzzleConcepts:Compositeness of matter at the lowest levels.Hadrons: mesons vs. baryons.Symmetries imply rules for composition.Charges come in many flavours.</p> <p>April 2014a.david@cern.ch - #CERNPhil20146Pieces to put togetherApril 2014a.david@cern.ch - #CERNPhil20147</p> <p>Quark puzzleHands-on partApril 2014a.david@cern.ch - #CERNPhil20148April 2014a.david@cern.ch - #CERNPhil20149</p> <p>April 2014a.david@cern.ch - #CERNPhil201410</p> <p>Plotting LHC discoveryConcepts:Peaks imply correlations.Quantities that are invariant.Discoveries are declared at some level of significance.April 2014a.david@cern.ch - #CERNPhil201411</p> <p>This is not pretend scienceOn November 10, 1974, SLAC's Burton Richter and colleagues found evidence for a particle they called the (the Greek letter Psi). Meanwhile on the east coast of the United States, Samuel Ting and his colleagues found comparable evidence for a particle they called the J.Both were the same particle and papers from both groups were published in Physical Review Letters on 2 December, 1974, as the first evidence for what is now known as the J/. Richter and Ting were jointly awarded the Nobel Prize in Physics in 1976 for the discovery, a mere two years after the work was done.April 2014a.david@cern.ch - #CERNPhil201412http://cern.ch/go/S8S7</p> <p>Its the dawn of an exciting age of new discovery in particle physics! </p> <p>At CERN, the LHC and its experiments are tuning up.</p> <p>CMS the Compact Muon Solenoid has been taking data. Our job is to understand how the detector responds to data from a known Standard Model particle in the 7 TeV run from 2010.The LHC and New Physics13The LHC is buried ~100 m below the surface near the Swiss-French border.</p> <p>The LHC and New Physics14Generic DesignCylinders wrapped around the beam pipeFrom inner to outer . . . Tracking Electromagnetic calorimeter Hadronic calorimeter Magnet*Muon chamber</p> <p>* location of magnet depends on specific detector design Detectors</p> <p>1515 Detectors21st April 2008Fergus Wilson, RAL16</p> <p>The beam particles each have a total energy of 3.5 TeV:2 x 3.5 TeV = 7 TeV*The individual particles that make up the proton only have a fraction of this energy. New particles made in the collision always have a mass smaller than that energy.</p> <p>Proton Interactions* This was the energy in the 2010 run. It has since been increased to 8 TeV.1717Particle DecaysThe collisions create new particles that promptly decay. Decaying particles always produce lighter particles. </p> <p>Conservation laws allow us to see patterns in the decays.</p> <p>Can you name some of these conservation laws?</p> <p>Particle DecaysOften, quarks are scattered in collisions. </p> <p>As they separate, the binding energy between them converts to sprays of new particles called jets. Muon signals can come from jets.</p> <p>They are not what we are looking for.</p> <p>We are studying the J/Y, a particle with no charge that decays into two muons.</p> <p>What do we know about the charges of the muons? What is the charge of the J/Y?</p> <p>Particle Decays</p> <p>Particle DecaysAn event with two oppositely charged muons might be a decay of the particle that we are interested in.</p> <p>It might also be something else. </p> <p>CMS Mass Plot of Z boson</p> <p>Histogram ReviewWell-defined peak Outliers: lower frequency Where is the peak?What is the width?Is the mass precise?</p> <p>Histogram ReviewWhere is the peak?What is the width?Where are the outliers?Not all histograms have same precision</p> <p>Histogram ReviewTwin peaks: Poor definition of one signal orTwo signalsIn particle physics, could be:Two separate particles orLarge signal as "background" and smaller bump showing actual particle under study.</p> <p>Higgs at LHCApril 2014a.david@cern.ch - #CERNPhil201426</p> <p>Another peak: B0s+-April 2014a.david@cern.ch - #CERNPhil201427</p> <p>Context for plot at: http://www.flickr.com/photos/uslhc/8182573711/ .The materialsApril 2014a.david@cern.ch - #CERNPhil201428</p> <p>Plotting LHC discoveryHands-on partApril 2014a.david@cern.ch - #CERNPhil201429More activitiesCMS Data Expressa "short form" of the CMS masterclass measurement that can be accomplished in 1-2 hours and is relatively easy to usehttps://quarknet.i2u2.org/document/cms-data-express </p> <p>CMS e-Labrather more involved; users can make mass plots and other histograms from relatively large sets of CMS data; login as guest; I can create accounts for those who want to get investigate further for use with students. http://www.i2u2.org/elab/cms</p> <p>April 2014a.david@cern.ch - #CERNPhil201430Wrap-upThere are lots of resources out there to inspire your students.If you want to know more about this, drop us a line.Ken is available to help you with the materials/activities: kcecire@nd.eduApril 2014a.david@cern.ch - #CERNPhil201431</p>