Higgs phenomenology

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(New page: Dedicated discussions on recent results and ongoing studies, such as backgrounds (tTbB), effects of strong experimental cuts such as jet veto on K-factors, efficiencies, definition of rapi...)
Current revision (14:21, 28 June 2009) (view source)
 
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* Jeppe
* Jeppe
* Radja
* Radja
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* Samir
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== Main discussions/contributions so far ==
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* '''review talks''' by ''Dieter'' and ''Ketevi''
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* O(alpha) and O(alphas) calculations for '''Higgs decay to 4 fermions''', corrections and discrepancies to HDECAY shown
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** ''Markus, Stefan''
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* new approach to '''multi-jet production''', for applications such as H+jets
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** ''Jeppe''
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* exp. study of '''WH, with H->bb, boosted Higgs''', fat jet, subjets
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** ''Giacinto''
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----
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* extensive discussion on '''exp. and theo. systematics for Higgs searches''', in particular H->WW
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** identified need to obtain best possible predictions for tT background in different regions of phase space, such as high and low phi_ll region
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** also very important: have such tT predictions for 0,1,>1jet bins
 +
** possible to get gg->WW background at NLO?
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** for a H->WW search below mH=150 GeV: would need even better control than what is aimed for now.
 +
** current best predictions of inc. Higgs cross section: scale error -11,+7%, pdf +-9 %.
 +
** '''Action item''': understand where this relatively large pdf error comes from
 +
** Would be nice to get understanding of the presentation of the Tevatron exclusion limit, in particular:inclusion of theo. uncertainties on SM prediction. Should the full band go below 1 for real exclusion?
 +
** Put effort to normalize (and understand in the detail the systematics) the Higgs signal to Z production. See also normalization discussions under Observables.
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** '''To be studied''': how much lumi and what level of systematic errors is needed to feed back LHC measurements (Z rapidity etc) into pdf determinations
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** ''Rohini, Bruce, Michael Dittmar, Radja, Joey, Guenther,Sally''
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** [[Wbb in the high pT HW region]]
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** Some of the discussion on [[Jet Substructure]] is also relevant.
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* [[ttH developments]]

Current revision

Dedicated discussions on recent results and ongoing studies, such as backgrounds (tTbB), effects of strong experimental cuts such as jet veto on K-factors, efficiencies, definition of rapidity gaps etc.

People signed up for this group:

  • Carlo
  • Bruce
  • Sally
  • Susan
  • Dieter
  • Rohini
  • Giampiero
  • Jon
  • Simon
  • Markus
  • Giacinto
  • Matthew
  • Stefano
  • Stefan
  • Ketevi
  • Joanna
  • Due Ninh
  • Sunhao
  • Gregorios
  • Jeppe
  • Radja
  • Samir


Main discussions/contributions so far

  • review talks by Dieter and Ketevi
  • O(alpha) and O(alphas) calculations for Higgs decay to 4 fermions, corrections and discrepancies to HDECAY shown
    • Markus, Stefan
  • new approach to multi-jet production, for applications such as H+jets
    • Jeppe
  • exp. study of WH, with H->bb, boosted Higgs, fat jet, subjets
    • Giacinto

  • extensive discussion on exp. and theo. systematics for Higgs searches, in particular H->WW
    • identified need to obtain best possible predictions for tT background in different regions of phase space, such as high and low phi_ll region
    • also very important: have such tT predictions for 0,1,>1jet bins
    • possible to get gg->WW background at NLO?
    • for a H->WW search below mH=150 GeV: would need even better control than what is aimed for now.
    • current best predictions of inc. Higgs cross section: scale error -11,+7%, pdf +-9 %.
    • Action item: understand where this relatively large pdf error comes from
    • Would be nice to get understanding of the presentation of the Tevatron exclusion limit, in particular:inclusion of theo. uncertainties on SM prediction. Should the full band go below 1 for real exclusion?
    • Put effort to normalize (and understand in the detail the systematics) the Higgs signal to Z production. See also normalization discussions under Observables.
    • To be studied: how much lumi and what level of systematic errors is needed to feed back LHC measurements (Z rapidity etc) into pdf determinations
    • Rohini, Bruce, Michael Dittmar, Radja, Joey, Guenther,Sally
    • Wbb in the high pT HW region
    • Some of the discussion on Jet Substructure is also relevant.
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