Measurement of Higgs self coupling in ??->HH

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Measurement of Higgs self coupling in ??-gtHH

• 2008/12/04
• Hiroshima Univ.
• N.MAEDA

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whats new?

• Luminosity distribution
• ?when generate event, generator considers
  luminosity distribution.
• reconstruction method
• ?choose candidate for particle that have the
  smallest ?2H or ?2W

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Reconstruction method

• add ?2 parameter to candidate.
• (j1j2, j3j4, ?2H , ?2W),
• (j1j3, j2j4, ?2H , ?2W),
• (j1j4, j2j3, ?2H , ?2W),
• Fill Histogram with only one candidate that has
  the most smallest ?2.
• Signal is HH, BG is WW....
• ?If consider two ?2, We can choose correct
  particle candidates, probably.

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reconstructed particle mass
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?2 2D Plot
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?2 2D Plot (Cuted)
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reconstructed particle mass (Cuted)
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Result

• Signal 4461 -gt 3713
• Background 4461 -gt 225

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instance of Histogram(Cuted)
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next plan

• add other BG reaction.
• (now, there is only uDUd)
• cutting BG event
• b-tagging