HSG5 Report: ongoing activity and 2012 plans Ricardo Gonçalo (RHUL) Higgs Working Group Meeting – 10 May 2012.

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Presentation transcript:

HSG5 Report: ongoing activity and 2012 plans Ricardo Gonçalo (RHUL) Higgs Working Group Meeting – 10 May 2012

H->bb 2011 paper H->bb 2011 paper near second circulation channels: ZH->llbb, WH->lνbb, ZH->ννbb Ricardo GoncaloHiggs working meeting - 10/5/20122

H->bb 2011 analyses “Simple” cut-based analyses – Search for a good W or Z, then search for 2 b- tagged jets Main difficulties: – Determination of main backgrounds from control regions – Long discussions on b-tagging and JES systematics – often just before deadlines – MC description of data (N jets, p T W …) not ideal => higher systematic uncertainties Plenty of lessons learned for future… Ricardo GoncaloHiggs working meeting - 10/5/20123

Ricardo GoncaloHiggs working meeting - 10/5/20124

Improvements… Systematics already playing a very big role: 1 st p T bin systematics- dominated degradation of limits: 25% to 40% Adding more data will help… but improving systematics will help more (plus adding more data…) Concerns: – Monte Carlo – Theory uncertainties – JES (happy with new developments, but waiting for convergence) – B-tagging llbb >200 Data stat (%) BG syst (%) lvbb >200 Data stat (%) BG syst (%) vvbb >200 Data stat (%) BG syst (%) Ricardo GoncaloHiggs working meeting - 10/5/20125

Planned improvements Fitting the backgrounds: – Plan to fit backgrounds in the limit code together with profiling uncertainties – Instead of sidebands and control regions b-jet energy corrections: – Semileptonic B decays – Inclusive b-JES? Improve background rejection Adjust to new pileup conditions Add substructure analysis – Ongoing: recent progress – …but CMS will have this for ICHEP … Ricardo GoncaloHiggs working meeting - 10/5/20126 p T W >200GeV

Ongoing 2011 analyses Some 2011 analyses in new channels are progressing: – ttH, H->bb analysis – Boosted VH analyses: same channels as existing H->bb analyses – Common with Exo: Minimal Walking Technicolor interpretation of existing analyses – Z->bb in diboson production – a standard candle for H->bb search More exploratory for now: – bH/A -> bbb – VBF H->bb interest from Victoria and Waseda Ricardo GoncaloHiggs working meeting - 10/5/20127

ttH analysis Analysis is progressing fast! Single- lepton channel looks promising Control regions to evaluate background/check data description Evaluating systematics: b-tagging dominant Complementary analyses: cut-based NN and kinematic fit Ricardo GoncaloHiggs working meeting - 10/5/20128 Lead jet p T No shape uncertainties

Minimal Walking Technicolor The idea is to see if we exclude some part of MWT parameter space using current WH/ZH analyses - proposed by Georges Azuelos Simply using existing ZH->llbb analysis obtained reasonable limits Will investigate reach with new signal MC Ricardo GoncaloHiggs working meeting - 10/5/20129

Conclusions Lots of activity ongoing Plans not yet crystalized Sorry I couldn’t make justice to all Ricardo GoncaloHiggs working meeting - 10/5/201210

Bonus slides Ricardo GoncaloHiggs working meeting - 10/5/201211