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ggH contamination in VBF phase space

The technique of the study

The gluon fusion Higgs production enters the VBF phase space because of perturbative effects of the Higgs + 0jets generation, and because of higher order diagrams. A calculation is being performed with MCFM for the contribution of Higgs + 2jets at NLO, after the selections listed here below.

selections applied

cut CMS ATLAS common
tag jets higest pT higest pT higest pT
jets num 2 jets w pT > 30 GeV 2 jets w pT > 25 GeV ?
jets eta < 4.5 < 4.5 < 4.5
Deta_jj > 3.5 > 3.8 ?
M_jj > 450 GeV > 500 GeV ?
etaProd_jj -- <0 ?
additional jets veto no other jets with pT > 30 GeV between tag jets no other jets with pT > 25 GeV and eta < 3.2 ?
leptons pT 20, 10 GeV 25, 15 GeV ?
leptons eta < 2.5 < 2.5 < 2.5

cross sections obtained with POWHEG

results with ATLAS cuts

Results on POWEGH sample Summer11 ggHtoWW2L2nu with Atlas selections:

mH eff powheg XS (pb) powheg XS x eff (pb) XSWG XS (pb) XSWG XS x eff (pb)
120 0.00265474 11.2892 0.0299698 16.63 0.0441483262
130 0.00317302 9.53531 0.0302557 14.12 0.0448030424
140 0.00398206 8.13482 0.0323933 12.13 0.0483023878
150 0.00507305 7.01608 0.0355929 10.50 0.053267025
160 0.00532965 6.09892 0.0325051 9.080 0.048393222
170 0.00588396 5.3462 0.0314568 7.729 0.0454771268
180 0.00638246 4.71815 0.0301134 6.739 0.0430113979
190 0.00674222 4.19424 0.0282785 5.896 0.0397521291
200 0.00702778 3.75046 0.0263574 5.249 0.0368888172
210 0.00747341 3.36979 0.0251838 4.723 0.03529691
220 0.00787387 3.05507 0.0240552 4.288 0.0337631546
230 0.0076372 2.77989 0.0212306 3.908 0.029846177
250 0.00830842 2.34094 0.0194495 3.312 0.027517487
300 0.0103102 1.68433 0.0173658 2.422 0.0249713044
350 0.0111828 1.59422 0.0178279 2.306 0.0257875368
400 0.0127373 1.40473 0.0178925 2.032 0.0258821936
450 0.0135939 0.94174 0.0128019    
500 0.0145492 0.593938 0.00864129 0.8491 0.0123537257
550 0.0143946 0.371216 0.0053435    
600 0.0154586 0.234221 0.00362074 0.3267 0.0050503246

results with CMS cuts

Results on POWEGH sample Summer11 ggHtoWW2L2nu with CMS selections:

mH eff powheg XS (pb) powheg XS x eff (pb) XSWG XS (pb) XSWG XS x eff (pb)
120 0.0037911 11.2892 0.0427993 16.63 0.063045993
130 0.00463679 9.53531 0.0442132 14.12 0.0654714748
140 0.00534603 8.13482 0.0434890 12.13 0.0648473439
150 0.00605493 7.01608 0.0424819 10.50 0.063576765
160 0.00644822 6.09892 0.0393271 9.080 0.0585498376
170 0.00696487 5.3462 0.0372356 7.729 0.0538314802
180 0.00747347 4.71815 0.035261 6.739 0.0503637143
190 0.00794784 4.19424 0.0333352 5.896 0.0468604646
200 0.00788239 3.75046 0.0295626 5.249 0.0413746651
210 0.00845531 3.36979 0.0284926 4.723 0.0399344291
220 0.00900131 3.05507 0.0274996 4.288 0.0385976173
230 0.0088737 2.77989 0.0246679 3.908 0.0346784196
250 0.0098079 2.34094 0.0229597 3.312 0.0324837648
300 0.01175582 1.68433 0.0198007 2.422 0.0284725476
350 0.0130557 1.59422 0.0208137 2.306 0.0301064442
400 0.0139828 1.40473 0.0196421 2.032 0.0284130496
450 0.0152761 0.94174 0.0143861    
500 0.0168134 0.593938 0.00998609 0.8491 0.0142762579
550 0.0167679 0.371216 0.00622452    
600 0.0183139 0.234221 0.00428951 0.3267 0.0059831511

people involved from ATLAS (A), CMS (C), theory (T)

Sara Diglio (A), Biagio Di Micco (A), Raffaele Gerosa (C), Pietro Govoni (C), Andrea Massironi (C), Giulia Zanderighi (T)

-- PietroGovoni - 11-Nov-2011

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formattemp powheg.input.TEMP r1 manage 3.9 K 2011-11-22 - 14:26 PietroGovoni  
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Topic revision: r4 - 2011-11-22 - RaffaeleAngeloGerosa
 
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