MSSM Higgs production in association with b quarks in the all hadronic final state at sqrt(s)=7 TeV

Abstract

A search for a neutral Higgs boson produced in association with at least one additional b quark and decaying into a pair of b quarks is performed in a data sample corresponding to an integrated luminosity of 4.0 $fb^{-1}$, recorded by the CMS detector in proton-proton collisions at the LHC with a center-of-mass energy of 7 TeV. This search is particularly sensitive to Higgs bosons in MSSM scenarios with large values of $tan\beta$. Upper limits on the $ pp \rightarrow bH + X, H \rightarrow b\bar{b} $ cross section are derived, and interpreted in terms of bounds in the MSSM parameter space.

Documentation

Analysis Summary CMS-PAS-HIG-12-026

Main Results

Measurements of this search are the 95% CL limits on the MSSM $\sigma(pp\rightarrow b\Phi)*BR(H\rightarrow b\bar{b})$ and $tan\beta$.

SM Higgs boson limit table: $\sigma(pp\rightarrow b\Phi)*BR(H\rightarrow b\bar{b})$

mass obs Limit (pb) median(pb) -68% +68% -95% +95%
90 GeV 537 897 644 1262 494 1644
100 GeV 451 708 525 877 401 1130
120 GeV 174 251 178 343 134 456
130 GeV 149 175 127 244 95.2 324
140 GeV 116 138 99.6 192 74.9 255
160 GeV 74.7 84.1 60.7 117 45.7 155
180 GeV 45.7 49.8 35.9 69.2 27.0 91.9
200 GeV 55.5 36.2 26.1 50.2 19.6 66.7
250 GeV 28.1 19.4 14.0 27.9 10.5 35.7
350 GeV 7.55 10.8 8.28 16.3 6.18 21.7

SM Higgs boson limit table: $tan \beta$ ($m_h^{max}$ scenario at $\mu=+200$ )

mass obs Limit median -68% +68% -95% +95%
90 GeV 27.0 36.0 30.0 43.7 25.5 51.5
100 GeV 29.7 36.0 31.4 42.6 27.6 50.6
120 GeV 25.4 30.2 25.2 36.2 21.8 42.6
130 GeV 26.2 28.8 24.1 34.7 20.6 40.8
140 GeV 27.7 30.4 25.6 36.4 22.1 42.7
160 GeV 27.8 29.7 24.9 35.5 21.3 41.9
180 GeV 27.0 28.3 23.7 34.0 20.4 40.0
200 GeV 38.8 29.9 25.0 35.8 21.4 42.2
250 GeV 44.1 35.6 29.7 43.8 25.5 50.7
350 GeV 51.1 64.7 54.7 79.0 46.5 91.3

SM Higgs boson limit table: $tan \beta$ ($m_h^{max}$ scenario at $\mu=-200$ )

mass obs Limit median -68% +68% -95% +95%
90 GeV 22.5 28.4 25.4 32.9 21.5 37.3
100 GeV 24.5 28.3 25.4 32.7 23.0 37.1
120 GeV 21.8 25.3 21.8 29.7 19.2 33.3
130 GeV 22.4 24.1 21.0 28.0 18.1 31.8
140 GeV 23.2 25.0 21.6 28.7 19.1 32.4
160 GeV 23.0 24.3 21.0 28.1 18.5 31.8
180 GeV 22.5 23.3 20.1 27.0 17.6 30.6
200 GeV 30.8 24.4 21.0 28.2 18.5 32.0
250 GeV 33.0 27.9 24.2 32.8 21.3 36.5
350 GeV 36.7 44.0 38.5 50.2 34.5 56.0

Plots/Tables from CMS-PAS-HIG-12-026 (click on plot to get .pdf)

Figure Abbreviated Caption
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/SVMass.png Figure 1: Normalised distributions of the mass of secondary vertices in jets for different flavours, in simulated $t\bar t$ events.
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/templates_m12_projection_csvt.png https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/templates_evtbtag_projection_csvt.png Figure 2: The $M_{12}$ (top) and EventBTag (bottom) projections of five templates, $(Bb)b$, $(Cb)b$, $(Qb)b$, $bbB$ and $bbX$ for the low-mass scenario.
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWikipl5gr9_pas5_m12_bbx_CSVT_negtag.png https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/pl5gr9_pas5_m12_bxb_CSVT_negtag.png https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/pl5gr9_pas5_m12_xbb_CSVT_negtag.png Figure 3: Normalised $M_{12}$ projection spectrum of the categories bbx (top), bxb (middle) and xbb (bottom) before (circles) and after (squares) the corrections, and the non-bb contribution (triangles) for the low-mass scenario. The ratio of the normalised corrected and uncorrected spectra are shown in the plots at the bottom.
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/SignalTemplates_mjjEvBTagTW_CSVT_M12_Low.png https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/SignalTemplates_mjjEvBTagTW_CSVT_EvBTag_Low.png Figure 4: The $M_{12}$ (top) and EventBTag (bottom) projections of signal templates for three different masses of the Higgs boson, $M_A = 120 GeV, M_A = 180 GeV, M_A = 250 GeV$ with the low-mass selection.
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/BGonly_templateFitStacked_CSVT_X.png (a) https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/BGonly_templateFitStacked_CSVT_Y.png (b) https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/BGonly_templateFitStacked_CSVT_XM.png (c) https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/BGonly_templateFitStacked_CSVT_YM.png (d) Figure 5: Results of the background-only fit in the triple-btag sample, on top (bottom) for the low-(high-)mass scenario. The cyan area corresponds to the templates errors. The left plot shows the projection in di-jet mass, the right plot the projection on the EventBTag axis.
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/mH_0200_templateFitStacked_CSVT_XM.png (a) https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/mH_0200_templateFitStacked_CSVT_YM.png (b) Figure 6: Results of the fit including a signal template for a Higgs boson with a mass of 200 $GeV/c^2$ in the triple-btag sample, for the medium-mass scenario. The left plot shows the projection in di-jet mass, the right plot the projection on the EventBTag axis.
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/signal_eff_mA.png Figure 7: Signal efficiencies as a function of the mass $M_A$ of MSSM pseudoscalar neutral Higgs in the low-mass scenario.
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/xsec_csvt.png (a) https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/xsec_csvt_zoom.png (b) Figure 8: Measured cross sections as a function of the mass the Higgs mass $M_A$. On the left for the full mass range and on the right for $M_A$ greater than $130 GeV/c^2. $
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/xsec_mA_bands_csvt.png (a) https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/xsec_mA_bands_csvt_log.png (b) Figure 9: The observed 95% C.L. upper limits on the cross section times the branching ratio. Linear-(log-)scale on top (bottom).
https://twiki.cern.ch/twiki/pub/CMSPublic/Hig12026TWiki/tanb_mA_bands_mu200.png Figure 10: Observed and median expected 95% C.L. upper limits on $ tan\beta $ versus $ M_A$ in the $m_{max}^{h}$ scenario for $ \mu = +200 GeV $.The expected $1\sigma$ and the $2\sigma$ bands are also shown .

Additional plots for public talks

CDF-D0-CMS-allhad.png
Figure:Comparison of CDF/D0 results with 'all-hadronic' ones

FeyngbH-1.png
Figure:Feynman diagram of Higgs boson production for b-quark off raditiation (5F schema, t-channel)

FeyngbH2.png
Figure:Feynman diagram of Higgs boson production for b-quark off raditiation (5F schema, s-channel)

-- IgorMarfin - 31-May-2012

Topic attachments
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PDFpdf BGonly_templateFitStacked_CSVT_X.pdf r1 manage 17.4 K 2012-07-04 - 00:32 IgorMarfin  
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PDFpdf BGonly_templateFitStacked_CSVT_XM.pdf r1 manage 17.2 K 2012-07-04 - 00:39 IgorMarfin  
PNGpng BGonly_templateFitStacked_CSVT_XM.png r1 manage 21.6 K 2012-07-04 - 00:39 IgorMarfin  
PDFpdf BGonly_templateFitStacked_CSVT_Y.pdf r1 manage 15.1 K 2012-07-04 - 00:32 IgorMarfin  
PNGpng BGonly_templateFitStacked_CSVT_Y.png r1 manage 18.2 K 2012-07-04 - 00:32 IgorMarfin  
PDFpdf BGonly_templateFitStacked_CSVT_YM.pdf r1 manage 14.9 K 2012-07-04 - 00:39 IgorMarfin  
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PNGpng FeyngbH-1.png r2 r1 manage 2.4 K 2012-09-12 - 17:26 IgorMarfin  
PNGpng FeyngbH2.png r1 manage 3.1 K 2012-09-12 - 17:14 IgorMarfin  
PDFpdf SVMass.pdf r2 r1 manage 14.3 K 2012-07-04 - 13:40 IgorMarfin  
PNGpng SVMass.png r2 r1 manage 16.8 K 2012-07-04 - 13:41 IgorMarfin  
PDFpdf SignalTemplates_mjjEvBTagTW_CSVT_EvBTag_Low.pdf r1 manage 13.9 K 2012-07-04 - 00:20 IgorMarfin  
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PDFpdf SignalTemplates_mjjEvBTagTW_CSVT_M12_Low.pdf r1 manage 14.6 K 2012-07-04 - 00:20 IgorMarfin  
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PNGpng signal_eff_mA.png r1 manage 16.8 K 2012-07-04 - 07:44 IgorMarfin  
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