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ttH

ttH. Akimasa Ishikawa Saga University. ttH. m H =120 ~ 200 GeV √s thre = m t *2+ m H = 470 ~ 550 GeV s (√ s thre + a ) = O(0.1) fb  O(100) events with 1000/fb ~1fb with m H =120GeV at 550GeV Decay ttH  bWbW (WW or ZZ)  10 fermions All jet mode Lepton mode Tau mode

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ttH

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  1. ttH Akimasa Ishikawa Saga University ttH meeting

  2. ttH • mH=120 ~ 200 GeV • √sthre = mt*2+mH = 470 ~ 550 GeV • s(√ sthre+ a) = O(0.1) fb  O(100) events with 1000/fb • ~1fb with mH=120GeV at 550GeV • Decay • ttH  bWbW (WW or ZZ)  10 fermions • All jet mode • Lepton mode • Tau mode • Neutrino mode • High jet multiplicity • Background should be different from ZH • We can share the background generator/production with ZHH group? ttH meeting

  3. Possible Background • High jet multiplicity modes • tt(g) • s ~ 500fb @ 500GeV • bWbW(qq) 6(8) fermions • ttZ • s ~ 500fb @ 500GeV • bWbWqq  8 fermions • WWH • s = ??? fb •  WW(WW or ZZ)  8 fermions • Suppressed by b tagging? • ZZH • s = ??? fb, should be smaller than WWH •  ZZ (WW or ZZ)  8 fermions • ZH  ttH • Identical to signal (interference) • The amplitude is smaller (ignorable) compared to signal. • Small number of fermions but large cross section • qq • WW ttH meeting

  4. Analysis • Exclusive Analysis based on decay mode • Cleaner but efficiency should be low • All jet mode • Lepton mode • Tau mode • Neutrino mode • Inclusive analysis based on fermion counting • Just count the number of fermions (jet, lepton and neutrino) • Event topology selection (sphericity, FW moment, etc.) • Loose mass selection on the W, t or H. • Dirtier against to exclusive, but efficieny is high • Number of signal is low O(100) so inclusive one is better? ttH meeting

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