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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 0.0733791 0.000194802 0.1080942736 0.000286962
130 0.00317302 0.132193 0.000419451 0.19575323 0.000621129
140 0.00398206 0.18599 0.000740624 0.2773340454 0.00110436
150 0.00507305 0.222599 0.00112926 0.333134125 0.00169001
160 0.00532965 0.251717 0.00134156 0.3747538453 0.00199731
170 0.00588396 0.234259 0.00137837 0.3386684514 0.00199271
180 0.00638246 0.199877 0.0012757 0.285486627 0.00182211
190 0.00674222 0.149848 0.00101031 0.2106465844 0.00142023
200 0.00702778 0.126321 0.00088776 0.1767946756 0.00124247
210 0.00747341 0.110743 0.000827626 0.1552139115 0.00115998
220 0.00787387 0.0991502 0.000780696 0.1391641557 0.00109576
230 0.0076372 0.0894613 0.000683234 0.12576570030336 0.000960498
250 0.00830842 0.0745903 0.000619728 0.1055316545 0.000876801
300 0.0103102 0.0529796 0.000546231 0.0761823971 0.000785456
350 0.0111828 0.0489857 0.000547799 0.0708566147 0.000792375
400 0.0127373 0.0371612 0.000473334 0.0537552751 0.000684697
450 0.0135939 0 0 0 0
500 0.0145492 0.0147404 0.00021446 0.0210729766 0.000306595
550 0.0143946 0 0 0 0
600 0.0154586 0.00594066 9.18344e-05 0.0082862443 0.000128094

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 0.00379118 0.0733791 0.000278194 0.1080942736 0.000409805
130 0.00463679 0.132193 0.000612951 0.19575323 0.000907667
140 0.00534603 0.18599 0.000994309 0.2773340454 0.00148264
150 0.00605493 0.222599 0.00134782 0.333134125 0.0020171
160 0.00644822 0.251717 0.00162313 0.3747538453 0.0024165
170 0.00696487 0.234259 0.00163158 0.3386684514 0.00235878
180 0.00747347 0.199877 0.00149377 0.285486627 0.00213358
190 0.00794784 0.149848 0.00119097 0.2106465844 0.00167419
200 0.00788239 0.126321 0.000995715 0.1767946756 0.00139356
210 0.00845531 0.110743 0.000936365 0.1552139115 0.00131238
220 0.00900131 0.0991502 0.000892482 0.1391641557 0.00125266
230 0.0088737 0.0894613 0.000793852 0.12576570030336 0.00111601
250 0.0098079 0.0745903 0.000731574 0.1055316545 0.00103504
300 0.0117558 0.0529796 0.000622819 0.0761823971 0.000895585
350 0.0130557 0.0489857 0.000639545 0.0708566147 0.000925083
400 0.0139828 0.0371612 0.00051962 0.0537552751 0.000751649
450 0.0152761 0 0 0 0
500 0.0168134 0.0147404 0.000247835 0.0210729766 0.000354308
550 0.0167679 0 0 0 0
600 0.0183139 0.00594066 0.000108797 0.0082862443 0.000151753

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: r5 - 2011-11-23 - RaffaeleAngeloGerosa
 
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