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Arguments for a “low mass” HiggsPowerPoint Presentation

Arguments for a “low mass” Higgs

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Low Mass Higgs @ LHCWhy low mass?Production characteristicsDecay characteristicsOverview of search strategiesorwho does what and how does it hang together

Arguments for a “low mass” Higgs

- 114 < mh < 200 @95%CL in SM
- LEP saw enhancement at 115 GeV.
- SUSY favors mh<135GeV

Other SM Physics Xsections(crude guestimates)

- Total Xsection = 1011pb
- b-quark pT>30GeV = 106pb
- W-> e/mu nu = 5x104pb
- Top-quark = 860pb
=> Always gives WW

- WW from QCD = 100pb
- Higgs = 10pb

When WW channel opens up pronounced dip in the ZZ BR

…

SM Higgs DecaysWW favored over ZZ by a factor 4-50 !!!

CMS L1 Trigger

- Di-electron/photon
- Di-muon
=> Only di-photon, WW, and ZZ decays matter

W,Z, and tau decays

- W:
- 10% to lepton & neutrino for each e,mu,tau
- 70% to di-jet

- Z:
- 3.4% each ee, mu mu, tau tau
- 20% for di-neutrino
- 70% for di-jet

- Tau:
- 35% for e or mu plus 2 neutrinos
- 50% for other “1-prong”

Some di-boson BR’sll = ee or mumutt = tau tau = two isolated tracksjj = di-jet

- BR(WW -> lnu lnu) = 4x1% = 4%
- BR(ZZ -> llll) = 4x0.1 % = 0.4%
- BR(ZZ -> lltt) = 4x0.08% = 0.3%
- BR(ZZ -> llnunu) = 2x0.7% = 1.4%
- BR(ZZ -> lljj) = 2x2.4% = 4.8%

Higgs Search Strategies

- 2 leptons & missing ET
- Shih-Chieh’s thesis at CDF
- Covers 3% of total BR(H->llnunu)

- Di-lepton & di-jet
- Matthew @ CDF for mH = 150GeV sweatspot
- Covers 2.4% x 8% = 0.2%

- Traditional 4 leptons
- Covers 0.4% x 8% = 0.03% @ 150GeV sweatspot
- ll track track may double this if we’re lucky ?
- Kevin @ CDF in WZ mostly

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