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1 st Ringberg LHC Olympics

1 st Ringberg LHC Olympics. Dr. Petra Haefner Max-Planck-Institut f ür Physik.

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1 st Ringberg LHC Olympics

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  1. 1st Ringberg LHC Olympics Dr. Petra Haefner Max-Planck-Institut für Physik

  2. „Im Namen aller Wettkämpfer gelobe ich, dass wir im Geiste der Sportlichkeit, zum Ruhme der Physik und zur Ehre unserer Gruppen an diesen Olympischen Spielen teilnehmen und dabei die Regeln, die für sie gelten, achten und befolgen und uns einer Physik ohne Doping und Datenfälschung verpflichtet fühlen.“ „In the name of all the competitors I promise that we shall take part in these Olympic Games, respecting and abiding by the rules which govern them, committing ourselves to physics without doping and data fraud, in the true spirit of sportsmanship, for the glory of physics and the honour of our groups.“ Schwur der Athleten Petra Haefner

  3. „Bei meiner Ehre erkläre ich, dass ich mich als Kampfrichter nur vom Geiste der sportlichen Fairness und der Würde der Physik leiten lassen werde. Ich verpflichte mich, die gezeigten Leistungen ohne Rücksicht auf die Person oder die Kollaboration gewissenhaft zu beurteilen.“ „In the name of all the judges and officials, I promise that we shall officiate in these Olympic Games with complete impartiality, respecting and abiding by the rules which govern them in the true spirit of sportsmanship.“ Schwur der Kampfrichter Petra Haefner

  4. Team Setup • Please write your name and team on the results sheet • Teams • A ATLAS • E Experimentalists (not ATLAS) • S String Theorists • T Theorists (not String) Petra Haefner

  5. The Ancient Olympics 1989 - 2000 A.C. 776 B.C. - 393 A.C.

  6. Z0 Decays 2 electrons 2 muons 2 tau leptons (2 neutrinos) (20%) 2 quarks 2 quarks + 1 gluon 2 quarks + n gluons W Decays electron + neutrino muon + neutrino tau + neutrino quark + anti-quark Vector Boson Decays Petra Haefner

  7. The Challenge • Measure the branching ratios of Z0 @ Delphi • List the following decays • ee •  •  • 2 jets (qq) • 3 jets (qqg) • 4+ jets (qqgg…) • The goal • Measure the strong coupling constant s via • s= k · N3jets / N2jets • with d = 5 GeV/c Petra Haefner

  8. since 2009 The Modern Olympics since 1896

  9. Top Pair Decays • Each top decays into W+b • Signature depends on W decays • allhadronic (bqq bqq) • semileptonic (bqq bl) • dileptonic (blbl) • Dileptonic decays are background to Zll • tT  ee  + jets • tT   + jets • tT  e + jets Petra Haefner

  10. The Challenge • Analyse Z0 decays @ ATLAS • Classify the events into the following categories • Zee • Z • tTee + … • tT + … • in ATLAS jargon tT stands for tt Petra Haefner

  11. Decathlon

  12. Marathon&Sprint

  13. The Higgs Hunter‘s Guide to Discovery Petra Haefner

  14. The Higgs Boson • Already predicted in 1964 by Peter Higgs • Searched for ever since • No evidence so far • A real Marathon! Petra Haefner

  15. Higgs Production & Decay • Different possible production mechanisms • Many different decay channels (mass dependent) • A lot of different signatures • Very high background cross sections Petra Haefner

  16. The „Golden“ Decay Channel • HZZ4l • Very clean signature (4e, 4, 2e+2) • Easy to identify particles • Moderate backgrounds (good mass separation) • Good discovery potential Petra Haefner

  17. The Challenge Find the 4 muon tracks in this Higgs event: Petra Haefner

  18. The Beginners

  19. The muons are high energetic.

  20. High energetic particles have straight tracks.

  21. The perspective is the key.

  22. Straight tracks can be best identified from a small angle.

  23. The Professionals

  24. Modern Pentathlon

  25. The Challenge • You are an expert in Event Displays by now! • So, here‘s the ultimate challenge • Distinguish the following SM decays • Z • W • tT • H • … and find new physics • Mini Black Hole • Indicate which decay signature you think it is (e, ,,, jets), e.g. HZZ4 Petra Haefner

  26. Stefan Silke Many Thanks!!! Petra Haefner Sandra Frank

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