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Higgs Identification In ATLAS Experiment
XU Jun YE Peiran Supervisor: Ana DUMITRIU CPPM 21/07/2017
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Procedure Theoretical part - Higgs boson
- Decay channel and the percentage - Reason that we choose this decay(H->ZZ/γγ) Experiment - recognize the decay products - reproduce the mass
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Higgs Boson Discovery Basic character: mass, etc. Feyman Diagram
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Decay Channel -Main Decay Channel: H->bb (57%) H->W+W- (21%)
H->gg (9%) -Problem: bb:background WW:hard to control the missing energy
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Decay Channel in this project
The main decay in this experiment: H->γγ H->4l Reason: Easy to reconstruct and measure in detectors Give a clean signal although the statistics is limited
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Experiment Reference:
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120.117GeV eeμμ 91.329GeV ee 4 leptons charge 2 photons
The trick you will use to be pretty sure that an actual particle was created in the collision is not only to recognize the decay products, such as muon-antimuon, electron-positron or photon-photon pairs, but also to reconstruct the mass of the decaying particle. GeV eeμμ 91.329GeV ee
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GeV eeee 95.647GeV μμ
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Result ee μμ γγ eeee eeμμ 9 7 22 2
Standard deviation of sample ~140
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Mean is far from the value of higgs , which is 125GeV
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Thanks for your attention
CPPM 21/07/2017
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