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ATLAS E&O 18.06.2013, CERN

www.physicsmasterclasses.org. Report International Masterclasses Uta Bilow, TU Dresden. ATLAS E&O 18.06.2013, CERN. International Masterclasses 2013. 25.2. – 22.3.2013 (22 days) 161 MCs (Fermilab-based: 29) ATLAS W: 55 ATLAS Z: 58 (12) CMS: 38 (17) ALICE: 10

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ATLAS E&O 18.06.2013, CERN

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  1. www.physicsmasterclasses.org Report International Masterclasses Uta Bilow, TU Dresden ATLAS E&O 18.06.2013, CERN

  2. International Masterclasses 2013 • 25.2. – 22.3.2013 (22 days) • 161 MCs (Fermilab-based: 29) • ATLAS W: 55 • ATLAS Z: 58 (12) • CMS: 38 (17) • ALICE: 10 • 37 VCs with CERN (12) • 130 institutes registered (29) + local Masterclasses, teachers´ days • ~ 10 % growth for 2013 • Further growth  extended period

  3. Running in 37 countries! New countries: Romania Turkey Cyprus Palestine Egypt Australia

  4. Video Conferences CERN-based: Test period 4.2. – 15.2. (Vidyo support team) 86 institutes tested (14 new institutes) WG VC preparing: Manuals for VC for local organisers Manual and twiki for moderators Training for mod. at CERN 18.2. Rooms (teachers´ lab, CMS centre) 33 Moderators! Rewarded with a Polar from the CERN shop Vidyo worked well Institutes are clearly better trained in 2013 Still lacking: chat, visual indication of speaker • Fermilab-based: • Crew of 3-4: • Facilitator • Moderator (FNAL/ANL) • Tech • (Featured scientist) • Icebreaker questions • No quiz

  5. New ATLAS W-path with real WW (+H) events Measurement • Wln • W+/W- ratio • WWllnn • Angular distribution between leptons MINERVA event display http://atlas.physicsmasterclasses.org/en/wpath.htm Improvements • 2011 real data: 693 WW/Higgs candidates (from released 1fb-1) mixed with 900 W and 4047 background events, password protected, split up into subsamples • Histogram tool developed • significance of data excess can be calculated with any cut on DF (ll) • spreadsheet and histogram websites connected with database

  6. New ATLAS W-path • W+/W- ratio: 1.25 • WW pairs recognition: quota too low, affects W+/W- ratio! • master thesis in physics didactics running • no new preselection necessary • revise cuts in decision tree for students 6

  7. New ATLAS Zpath M(eemm)=123 GeV M(gg)=125 GeV Data from 2011 • 10.000 l+l- events (password protected, 100 free) • 1.000 fully simulated Z’ events • 13 data groups/directories, 20 subgroups (A-T), and 50 events/mixed sample/2 students • 50% Z, 30% gg, 10% (J/y,U), 5% Z', 5% l+l-l+l- • Higgs candidate events: • 1 fb-1 and cuts according to ATLAS publication • corresponding Higgs MC signals (125 GeV ) HYPATIA event display http://atlas.physicsmasterclasses.org/en/zpath.htm Master the invariant mass technique • categorise events: l+l-, mumu, gg, 4l • to study and measure the Z boson and other resonances (J/y, U) decaying to l+l- • to search for new physics (Z’) • to search for the Higgs boson in gg and l+l-l+l-

  8. New ATLAS Zpath OPloT: • Mll and/or Mgg and/or Mllll • discussed locally and in VC • Invariant mass as a tool to identify particles, to discover new particles, and to search for exotic particles

  9. CMS measurements 9 Measurements J/Y for schools, workshops W/Z for IMC Event display iSpy-online with capabilities to zoom, rotate, switch objects on/off Improvements Better transfer of results Now in 11 languages Add a small number of Higgs candidates (4 leptons only)

  10. ALICE measurements 10 Measurement • Option 1 • Strangeness: decay patterns of V0s: K0s, Λ, anti-Λ from p-p collisions • Option 2 • Measure nuclear suppression factor RAA New and noteworthy • visual analysis: • 30 events (2012) , 15 events (2013) • Samples • Small p-p at 7 TeV • large pb-pb at 2.76 TeV • p-Pb collisions in 2012 • show different result from Pb-Pb samples: evidence of hot plasma?

  11. Organisation, Funding, Support Central organisation at TU Dresden Michael Kobel, Uta Bilow (financed by CERN until 2015), student assistants Coordination Fermilab-based MCs (America, Far East, Australia) Ken Cecire (supported by QuarkNet) WG Video conference (Kate Shaw, Michael Hauschild, Laurenz Widhalm†, Uta Bilow) Steering group(Farid Ould-Saada, Michael Kobel, Ken Cecire, Pete Watkins, Despina Hatzifotiadou, Yiota Foka, Ralf Averbeck, Uta Bilow) Funding from EPS HEPP Division in kind contributions (CERN, Fermilab, Vidyo team, moderators, …) IMC steering group and the IPPOG co-chairs working to establish a document: mandate of group, membership, quality assurance, procedure for new measurements, Currently, measurements from ALICE, ATLAS, CMS LHCb measurement (Lifetime of D0) expected in 2014 – not yet approved by IMC SG TOTEM preparing measurement AMS expressed interest in participation

  12. Summary Measurements and tools improved, better combination, no last-minute aid Very positive feedback, esp. from newcomers „smooth as silk“, „great“, „excellent“ „very nice opportunity to share our science with young students and it also produces some common goals for our team of researchers“ Most feedback on VC: too long / too short, earlier / later

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