Pamela Ferrari 1 Pamela Ferrari 1 Recontres de Moriond ‘05 QCD and Hadronic interactions QCD and Hadronic interactions Recontres de Moriond-La Thuille 12-19 March 2005 Searches for Higgs in the MSSM Searches for Higgs in the MSSM CP-conserving and CP-violating scenarios CP-conserving and CP-violating scenarios at LEP at LEP P.Ferrari (CERN) on behalf of the LEP experiments -model introduction -model introduction -the CP-conserving MSSM -the CP-conserving MSSM -the CP-violating MSSM -the CP-violating MSSM -2HDM -2HDM
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QCD and Hadronic interactions Recontres de Moriond-La Thuille 12-19 March 2005
QCD and Hadronic interactions Recontres de Moriond-La Thuille 12-19 March 2005 Searches for Higgs in the MSSM CP-conserving and CP-violating scenarios at LEP P.Ferrari (CERN) on behalf of the LEP experiments. -model introduction -the CP-conserving MSSM -the CP-violating MSSM -2HDM. - PowerPoint PPT Presentation
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Pamela Ferrari 1Pamela Ferrari 1 Recontres de Moriond ‘05
QCD and Hadronic interactionsQCD and Hadronic interactions
Recontres de Moriond-La Thuille 12-19 March 2005
Searches for Higgs in the MSSM Searches for Higgs in the MSSM
CP-conserving and CP-violating scenarios CP-conserving and CP-violating scenarios at LEPat LEP
Excluded rectangular region for Excluded rectangular region for 1<m1<mhh<55 GeV when 3<m<55 GeV when 3<mAA<63 GeV<63 GeVBut for mBut for mAA> 63 values of m> 63 values of mh h down to down to 00are still allowed !are still allowed !
No tanNo tan exclusion independent of exclusion independent of mmhh/m/mAA
OPAL general 2HDM(II) OPAL general 2HDM(II) scanscan
2HDM(II) have no constraint derived from SUSY: h h bb is not dominant decay,e.g for bb is not dominant decay,e.g for αα=0 BR(h=0 BR(hbb/bb/)=0 )=0 flavour-indep. searches flavour-indep. searches large regions of the parameter space cannot be exlcuded by LEPlarge regions of the parameter space cannot be exlcuded by LEP
light Higgs not ruled outlight Higgs not ruled out
hep-ex/0408097
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ConclusionsConclusions
At LEP we have searched for Higgses in several extensions of SM:CP-conserving MSSMCP-conserving MSSMCP-violating MSSMCP-violating MSSM2HDM2HDM
No evidence of the presence of a signal has been found
Still there is room for the presence of a light Higgs:In CP-violating MSSM In CP-violating MSSM
In 2HDMsIn 2HDMs
Some theoretical papers interpreting small data-background discrepancy (about 2 ) in the context of specific CPC MSSM scenarios ( require quite some tuning) as well as CPV MSSM and 2HMD.
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Back-upBack-up
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SM vs MSSM excessSM vs MSSM excess
The excesses at mh=98 & 115 GeV Observed in
MSSM are the same that where observed in the
SM searches:
mh~98 GeV 2.3 excess 1-CLb= 2% from all hZ channels
Not Compatible with a SM signal.
mh~115 GeV 1.7 excess 1-CLb= 9% from ALEPH hZ 4-jet channel Compatible with a SM signal.
1-CLb gioves the Probability of a local fluctuation of background.Probability that a fluctuation appears anywhere within a certain mass range is given by:
resolution mass
range mass ΔCL1 b
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mmhh max scans max scans
mt=174.3,179,183 GeV
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No-mixing No-mixing
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Useful searches for CPV Useful searches for CPV MSSMMSSM
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CPH vs FEYNHIGGSCPH vs FEYNHIGGS
The largest discrepancy occurs for large tanwhere Feynhiggs predicts a higher x-section for Higgstrahlung
Data/background discrepancy in intemediate tan region:due to excess at mh~98 GeV which is the mH2
mass in this
region
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CPX-phasesCPX-phases
Exclusion decreases
With increasingargAt,b (CP-
Violation)
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2HDM scan 2HDM scan
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2HDM scan tan2HDM scan tan exclusion exclusion
No tan exclusion independent from mh and mA
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