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First Look at the Interpretation of ATLAS Higgs Searches in the CPX Scenario of the Complex MSSM. Markus Schumacher , Bonn University May 13th 2004, CERN. Phenomenology of CPX Scenario Technicalities Discovery Potential Problematic Regions ?. - PowerPoint PPT Presentation
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First Look at the Interpretation of ATLAS Higgs Searches in the CPX Scenario of the Complex MSSM
Markus Schumacher , Bonn University
May 13th 2004, CERN
Phenomenology of CPX Scenario
Technicalities
Discovery Potential
Problematic Regions ?
Disclaimer: this are first very preliminary results from a study in progress and NOT official ATLAS results.
Please do note quote plots as ATLAS results!
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 2
The CPX scenario
MSSM Higgs Sector CP conserving at Born level
CP effects via complex couplings in loops: ComplexMSSM
relevant for Higgs sector are:
complex trilinear couplings At, Ab and
complex gluino mass paramer Mgluino
MSUSY = 500 GeV, At=Ab=Mgluino=1 TeV, =2TeV,
M2=200GeV, arg(At)=arg(Ab)=arg(Mgluino)=90 degree
Maximal effect in Higgs sector CPX scenario(suggested by Carena, Ellis, Pilaftsis, Wagner et al.)
+ scan of Born level parameter: tan and MH+-
Parameter choice for this first scan:
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 3
Phenomenology in the CPX scenario
mixing between CP even and CP odd states
All neutral bosons can couple to pair of W and Z bosons
among themselves Hi,Hj,Hk
Compare to CP Conserving real MSSM:
no born level coupling of A to WW,ZZ, A to hh (HH)
h(H) to Zh(H), A to AZ
Mass eigenstates H1, H2, H3 not equal CP eigenstates h,A,H
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 4
H1, H2 and H3 may be produced in VBF, WH and ZH processes decay to pair of W/Zs, pair of Higgs bosons, H+Z bosons
Sum rule for couplings:
i gi (ZZHi) = gSM (ZZHSM) 2 23
H1
H2
H3
Phenomenology in the CPX scenario
H2 and H3 decay into H1H1 and H1Z
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 5
Mass of the Lightest Higgs Boson H1
120<MH1<130GeV
110<MH1<120GeV
90<MH1<110GeV
70<MH1<90GeV
40<MH1<70GeV
0<MH1<40GeV
even masses between
0 and 40 GeV
not excluded by LEP
problematic for LHC
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 6
Some Technicalities
masses, couplings and branching ratios calculated so far
with FEYNHIGGS 2.1( Heinemeyer, Weiglein et al. )
needs/will be cross checked by CPSUPERH ( A.Pilaftsis, J.S.Lee et al.)
SM like cross sections calculated in leading order with M. Spira‘s programs + CTEQ5L parton density functionscharged Higgs cross sections obtained from T. Plehn‘s program
MSSM cross sections obtained by appropiate correction factors
Gluon fusion: MSSM) = (Hi gg) / (HSM gg) x SM)
VBF,ZH,WH: MSSM) = gHiVV x SM)
ttH/bbH: MSSM) = sffHi x ffH) + pffHi x ffA)
2
2 2
discovery = 5 sigma excess using Poissonian statistics
combination of channels with likehood ratio method
running bottom quark mass usedd for bbH, gbtH+-
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 7
Experimental Inputs
efficiencies and background predictions taken from
documented ATLAS analysis (see below) corrections due to larger total decay width taken into account for VBF channels: assume same efficiencies for
contribution of CP even and CP odd states (needs to be checked)
for ttH: efficiencies for CP even and odd bosons are the same
VBF channels: SN-ATLAS-2003-024
ttH, Hbb: ATL-PHYS-2003-003
Charged Higgs: ATL-PHYS-2003-58 (low mass), SN-ATLAS-2002-017, (high mass)
bbH/AATL-PHYS-2002-021 (low mass),ATL-PHYS-2000-005 (high masses)
bbH/Alep. hadATL-PHYS-2000-001 (low m.), ATL-PHYS-2003-008 (high m.)
had. Had: ATL-PHYS-2003-008 ( masses > 450 GeV)
Remaining analysis from ATLAS Detector and Physics Performance TDR
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 8
H and HZZ4 leptons
H1GGF+ass. prod.
30fb-1
300fb-1
HiZZ4l
300fb-1
H1
H2
H3
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 9
ttH with Hbb and bbH with H
ttH, Hbb
H1 300fb-1
H1 30fb-1
H2 300fb-1
MH1= 70GeVdiscovery region partiallylimited by avaibility
of inputs only down to MH = 70 GeV
(ttH at low tanbbH at low M+-)
Zoom in
bbH1, H1
H1 300fb-1
H1 30fb-1
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 10
Weak Vector Boson Fusion
H2
H1
H1 WW
30fb-1
H3
discovery region for low tan limited by avaibility of inputs
only down to 110 GeV
MH1= 110GeVMH2= 110GeV
Zoom in
only studied for low luminosity running so far (forward jet tagging, central jet veto in presence of pile up)
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 11
Discovery Potential Light Higgs Boson H1Zoom in
low Higgs masses below 70 GeV
not studied yet in ATLAS
for M H+- >190GeV discovery
in at least two channels
bbH1, H1
ttH1, H1bb
H1 H1ZZ4l
VBF: H1
MH1= 70GeV
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 12
Discovery Potential H2 and H3
300fb-1
H2,3 tt
H2WWll
140 GeV< MH
H2H1H1bb
H3H1 Zbb ll
H2H1 Zbb ll
60 GeV< MH1,
200<MH2/3 < 360 GeV
H2/3 30fb-1
H2/3 30fb-1
H2/3 300fb-1
only studied for low luminosity running so far
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 13
Charged Higgs Bosons
30fb-1 300fb-1
gbH+-t
H+- , tbqq
low mass: mH+-< mtop
ttH+- b Wb
WlH+-
30fb-1
WqqH+-
30fb-1
high mass: mH+-> mtop
only studied for low
luminosity running so far ( tau tagging for soft taus
in presence of pile up)
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 14
Overview of Discovery Potential
Zoom in
Two „problematic“ regions
Discovery of H1
Discovery of H2 and/or H3
Discovery of H+-
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 15
Problematic Region I
poor man‘s combination of : H1andH2
H1H2
partially covers hole
see what happens if:
increased lumi. = 60fb-1
extrapolate inputs to MH=100 GeV
H1H2
VBF, HSo far:M>110GeV, int. lumi= 30fb-1
increased coverage + combination covers hole
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 16
Problematic Region II
MH1<50GeV
100<MH2<110 GeV
130<MH3<180 GeV
VBF: H230fb-1, 110GeV<MH
Charged Higgs ttH+- b Wb
ttH2, H2bb
try look for H3WWll
WqqH+-30fb-1
Analysis surrounding hole:
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 17
Problematic Region II
VBF: H2
30fb-1 60fb-1
110GeV<MH 100GeV<MH
H3WWll3observation with 300fb-1
Charged Higgs30fb-1 100fb-1
other ideas for improved coverage:
investigate high luminosity running for VBF,
lower masses for H3ZH1llbb, try ggH+1 hard jet, H
H+-WH1, Higgs pair production + other new or rare decay modes ??
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 18
Conclusions
First preliminary interpretation of ATLAS Higgs searches in CPX scenario has been performed
Good coverage over most of tan vs. MH+- plane,
two problematic regions have been identified and ideas for coverage are on the way study smaller Higgs boson masses at LHC
Investigate „problematic“ regions in more detail
maybe suggest new analysis/ search channels
Crosscheck results with CPSUPERH
Study different values for complex phases
Thanks for programs and discussions to:
Philip Bechtle, Sven Heinemeyer, Tilman Plehn David Rainwater, Michael Spira,…
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 19
Backup Slides
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 20
Discovery Potential for Heavy Neutrals
M. Schumacher, ATLAS Higgs Interpretation in the CPX Scenario of MSSM 21
OPAL PLOTS