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Žilina, CMS measurement Ivan Melo
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Particles of the Standard Model
W - path W - path Hadrons: p, n, π, K, ...
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Urýchľovače – továrne na nové častice
E = mc2 p + p → H + ... 125 GeV + ... 1 GeV + 1 GeV + Ekin = GeV 3
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27 km supravodivých magnetov chladených na 1,9 Kelvina
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LHC Collider v CERNe °ATLAS CMS ° Mont Blanc ALICE LHC-b
LHC odstavený na 2 roky Nazbieral 30 fb-1 (objav novej častice 12 fb-1)
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* location of magnet depends on specific detector design
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
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CMS detector Identifikácia častíc
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pp -> Z -> e+e-
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Detector Tracks 9 Web Version
Mac users: Choose the “Web Version” at the upper right. 9 9
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Detector Tracks 10 Web Version
Mac users: Choose the “Web Version” at the upper right. 10 10
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Detector Tracks 11 Web Version
Mac users: Choose the “Web Version” at the upper right. 11 11
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Detector Tracks 12 Web Version
Mac users: Choose the “Web Version” at the upper right. 12 12
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Transverse momentum pT
Sum of initial pT = 0 Sum of final pT = 0
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Chýbajúca priečna hybnosť
If sum of final pT ≠ 0: 1+2+3 1 2 3 Missing pT = Missing ET = ETMiss ETMiss > 20 GeV (asi neutríno) ETMiss < 20 GeV (nie neutríno, skôr nedokonalosť detektora)
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W production and decay R = W+/W- 15
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Higgs boson production
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W and Z decays Higgs decay events: H ZZ e+e-e+e- H ZZ e+e-μ+μ- H ZZ μ+μ-μ+μ- H γγ
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Invariantná hmotnosť
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Invariantná hmotnosť Signál +pozadie Pozadie (background)
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Useful links CMS exercise http://www.svetcastic.sk
Click on International Masterclasses 2016 / Click on Physics then on CMS, e.g. English Read Introduction and WZH path iSpy software available at To enter results into spreadsheet go to: Useful instructions for tutors, go to (and choose CMS)
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