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Reweighting gg →H→WW Giovanna Davatz, ETH Zurich Les Houches Workshop, 10 th may 2005

Reweighting gg →H→WW Giovanna Davatz, ETH Zurich Les Houches Workshop, 10 th may 2005. Want to check if K dependent on y Higgs , or only on p T Higgs. →reweight Pythia to MC@NLO as a function of p T Higgs , then compare reweighted Pythia y Higgs with y Higgs from MC@NLO.

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Reweighting gg →H→WW Giovanna Davatz, ETH Zurich Les Houches Workshop, 10 th may 2005

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  1. Reweighting gg→H→WWGiovanna Davatz, ETH ZurichLes Houches Workshop, 10th may 2005

  2. Want to check if K dependent on y Higgs, or only on pTHiggs →reweight Pythia to MC@NLO as a function of pTHiggs, then compare reweighted Pythia yHiggs with y Higgs from MC@NLO

  3. No cuts applied, difference in y Higgs between MC@NLO and Pythia reweighted to MC@NLO small. Apply now jet veto:

  4. K= sMC@NLO / sPYTHIA

  5. For low pTHiggs region and low y Higgs region difference between K(pT) and K(pT,y) very small K(pT,y) K(pT) Selection cuts for H→ WW →2l favor low pTHiggs and central y Higgs region (next slide)

  6. Efficiency for Pythia after all selection cuts are applied [jhep05(2004)009 ]: pTHiggs, y Higgs

  7. Conclusion In the region favored by the H→WW→lnln selection cuts (inclusive jet veto), the difference between K(pT) and K(pT,y) is smaller than 2% [ K is defined here as the (pT respectively y dependent) ratio between s(MC@NLO) and s(Pythia) ]

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