Search for a light pseudoscalar Higgs boson in the dimuon decay channel in pp collisions at sqrt{s} = 7 TeV

Published in Physical Review Letters http://cds.cern.ch/record/1458514?ln=en

What follows is a condensed description with plots for the analysis CMS-HIG-12-004

Abstract

The dimuon invariant mass spectrum is investigated in the mass range between 5.5 GeV and 14 GeV using 1.3 fb-1 of pp collision data at a center of mass energy of 7 TeV collected by the CMS detector at the LHC to search for a light pseudoscalar Higgs boson. Such a light Higgs boson is predicted in many models, including the Next-to-Minimal Supersymmetric Standard Model (NMSSM) which avoids the m-term problem of the MSSM. A limit on the cross section times branching ratio is set.

Main Results

We perform a search for a narrow, low mass, pseudoscalar a which is produced by and decays via in the mass ranges 5.5-8.8 GeV and 11.5-14 GeV, using a data sample corresponding to 1.3 fb-1 collected with the CMS detector. Given the good agreement with SM background predictions, we set upper limits on the cross section times branching ratio of in the mass ranges considered. These upper limits are applied in the context of the light pseudoscalar a1 of the NMSSM to yield upper limits on the NMSSM parameter , which specifies the fraction by which the a1 overlaps the MSSM doublet Higgs fields at the amplitude level. These limits are superior to those from BaBar for a significant portion of the mass range, and are the only limits available in the mass range.

Figures from the publication. They can/should be used in talks:

-- Maxwell Chertok Nov. 21, 2013

Figures from CMS-HIG-12-004

PAS Figure Image File Description
Figure 1a pdf, png Feynman diagram for the production mechanism
Figure 1b pdf, png Cross section for production at s = 7 TeV for = 1, 2, 3, 10, 30, 50. We plot the cross section including all available higher order corrections as per HIGLU, especially those from resolvable parton final state contributions ()
Figure 2a pdf, png Dimuon invariant mass distribution for the central region after the optimization of the cuts for the background reduction. The invariant mass distributions are fitted (red curves) accounting for the three bottomonium resonances and QCD background
Figure 2b pdf, png Dimuon invariant mass distribution for the endcap region after the optimization of the cuts for the background reduction. The invariant mass distributions are fitted (red curves) accounting for the three bottomonium resonances and QCD background
Figure 3a pdf, png Invariant mass spectrum in the barrel region (y-axis zoom)
Figure 3b pdf, png Invariant mass spectrum in the endcap region (y-axis zoom)
Figure 4a pdf, png Upper limit for mass range 1
Figure 4b pdf, png Upper limit for mass range 2
Figure 5 pdf, png Upper limit for . For each value in mass range 1 there is a second dotted curve that shows the limits from the BaBar analyses.

-- MarioPelliccioni - 01-Mar-2012

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf A_crossSec7TeV.pdf r1 manage 17.1 K 2012-03-01 - 15:46 UnknownUser Theoretical production cross section of the a at LHC
PNGpng A_crossSec7TeV.png r1 manage 28.3 K 2012-03-01 - 15:59 UnknownUser Theoretical production cross section of the a at LHC
PDFpdf Data_barrel.pdf r2 r1 manage 22.2 K 2012-03-05 - 20:40 MaxwellChertok Invariant mass spectrum in the barrel region (y-axis zoom)
PNGpng Data_barrel.png r3 r2 r1 manage 103.5 K 2012-03-05 - 20:41 MaxwellChertok Invariant mass spectrum in the barrel region (y-axis zoom)
PDFpdf Data_endcap.pdf r2 r1 manage 22.0 K 2012-03-05 - 20:48 MaxwellChertok Invariant mass spectrum in the endcap region (y-axis zoom)
PNGpng Data_endcap.png r3 r2 r1 manage 103.1 K 2012-03-05 - 20:43 MaxwellChertok Invariant mass spectrum in the endcap region (y-axis zoom)
PDFpdf FeynNMSSM.pdf r1 manage 7.4 K 2012-03-01 - 15:46 UnknownUser Feynman diagram of the a production
PNGpng FeynNMSSM.png r1 manage 8.4 K 2012-03-01 - 15:59 UnknownUser Feynman diagram of the a production
PDFpdf UpperLimitPlotNewHybrid_R1.pdf r1 manage 27.1 K 2012-03-01 - 15:51 UnknownUser Upper limit for mass range 1
PNGpng UpperLimitPlotNewHybrid_R1.png r1 manage 16.8 K 2012-03-01 - 16:12 UnknownUser Upper limit for mass range 1
PDFpdf UpperLimitPlotNewHybrid_R1_new_crop.pdf r1 manage 58.4 K 2013-11-21 - 18:34 MaxwellChertok Figures from the PRL
PDFpdf UpperLimitPlotNewHybrid_R2.pdf r1 manage 25.0 K 2012-03-01 - 15:51 UnknownUser Upper limit for mass range 2
PNGpng UpperLimitPlotNewHybrid_R2.png r1 manage 12.5 K 2012-03-01 - 16:12 UnknownUser Upper limit for mass range 2
PDFpdf UpperLimitPlotNewHybrid_R2_new_crop.pdf r2 r1 manage 73.7 K 2013-11-21 - 19:59 MaxwellChertok PRL: cross section limit for higher mass range
PDFpdf ctamaxcmsanalysis.pdf r1 manage 28.5 K 2012-03-01 - 16:31 UnknownUser Upper limit on cos(theta_A)
PNGpng ctamaxcmsanalysis.png r1 manage 42.3 K 2012-03-01 - 16:32 UnknownUser Upper limit on cos(theta_A)
PDFpdf ctamaxcmsanalysis_new_crop.pdf r1 manage 167.3 K 2013-11-21 - 18:34 MaxwellChertok Figures from the PRL
PDFpdf data-semilog-ai.pdf r1 manage 217.1 K 2013-11-21 - 18:34 MaxwellChertok Figures from the PRL
PDFpdf fullFitReReco_barrel.pdf r2 r1 manage 26.4 K 2012-03-05 - 20:15 MaxwellChertok Total invariant mass spectrum fit in the barrel
PNGpng fullFitReReco_barrel.png r2 r1 manage 128.9 K 2012-03-05 - 20:21 MaxwellChertok Total invariant mass spectrum fit in the barrel
PDFpdf fullFitReReco_endcap.pdf r2 r1 manage 27.0 K 2012-03-05 - 20:22 MaxwellChertok Total invariant mass spectrum fit in the endcap
PNGpng fullFitReReco_endcap.png r2 r1 manage 137.4 K 2012-03-05 - 20:38 MaxwellChertok Total invariant mass spectrum fit in the endcap
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Topic revision: r5 - 2013-11-21 - MaxwellChertok
 
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