cp conserving (cpc) benchmark scenarios discovery potential in cpc scenarios discrimination sm or...
TRANSCRIPT
CP Conserving (CPC) Benchmark Scenarios
Discovery Potential in CPC scenarios
Discrimination SM or Beyond
The CP Violating CPX Scenario
Discovery Potential in the CPX Scenario
Conclusions
Investigation of the Disovery Potential for Higgs Bosons of the MSSM with ATLAS
Markus Schumacher , Bonn University
June 2004, SUSY04, Tsukuba
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 2
The Higgs sector of the CPC MSSM
t b/ W/Z
h cossin
-sincos
sin()
H sinsin
cos/cos
cos()
A cot tan -----
Couplings MSSM/SM
Two Higgs Doublets 5 physical bosons: h, H, A, H+, H-
at Born level 2 parameters: tan, m A mh < MZ
large loop corrections mh < 133 GeV (+-3GeV) corrections depend on 5 SUSY parameters: Xt,M0,M2,Mgluino,
5 parameters fixed in the benchmark scenarios considered
LO-SM-like cross sections
Xsec for gbtH+- from Plehn Program
small small BR(h,bb)
large large BR(h,H,A,bb)
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 3
The 4 CPC Benchmark scenarios
MHMAX scenario ( MSUSY = 1 TeV ) maximal mh < 133 GeV
Nomixing scenario ( MSUSY = 1 TeV ) small mh < 116 GeV
Suggested by Carena et al. , Eur.Phys.J.C26,601(2003)
Masses, coupling and BRs calculated with FeynHiggs (Heinemeyer et al.,Status Mai 04)
Gluophobic scenario
suppressed coupling to gluon
(cancellation of top+stop loops)
small rate for : gg H, e.g. H
MSUSY=350GeV, mh < 119 GeV
Small scenario
coupling to b () suppressed
(canc. sbottom, gluinoloops)
for large tan, MA 150500 GeV
MSUSY = 800 GeV, mh < 123 GeV
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 4
Experimental Issues
key performance numbers obtained from full simulation:
e.g. b-tagging, -id, mass resolutions .…
efficiencies and background expectations from fast
simulations (some key analysis fully checked with full sim.)
int. lumi = 30 fb-1 ~ 2 to3 years at low lumi operation
int. lumi = 300fb-1 = 30 fb-1 @ low lumi. + 270fb-1 @ high lumi
corrections due to larger total decay width taken into account
signal overlap/ mass degeneracy of Higgs bosons considered
discovery = 5 sigma excess using Poissonian statistics
combination of channels with likehood ratio method no systematic uncertainties considered when
evaluating observation potential
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 5
Experimental Inputschannel lumi Mass range Publication
VBF, HWW low M>110 GeV SN-ATLAS-2003-024
ttH, Hbb low+high M>70GeV ATL-PHYS-2003-003
bbH/A low+high 70<M<135GeV
M> 120 GeV
ATL-PHYS-2002-021
ATL-PHYS-2000-005
bbH/Alep.had
had. Had
low
low
M>120GeV
M > 450 GeV
ATL-PHYS-2000-001 ATL-PHYS-2003-008
ATL-PHYS-2003-008
gbtH+-, H,tb low+high M >180 GeV SN-ATLAS-2002-017
ttbW bH+-, H+- low M < 170 GeV ATL-PHYS-2003-58
H/A low+high M > 350 GeV TDR
AZhllbb, Hhhbb
low+high 60 <ML<130 100<MH<360
TDR TDR
H low+high M > 70 GeV TDR
ZZ4l low+high M > 100 GeV TDR
WWll low+high 140<M <120GEV TDR
WHlbb low 70<M<130GeV TDR
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 6
almost gurantees
discovery of at least one
h or H with 30 fb-1
Vector Boson Fusion: 30 fb-1
VBF:qqqqH
Following work by Plehn, Rainwater, Zeppenfeld
studied for MH>110GeVat low lumi running
SM like h with 30 fb-1
ll4
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 7
Light Higgs Boson h: 30 fb-1
difference in covered regions and
contributing channels
mainly due to difference in
mh at same (tan,MA) point
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 8
Small scenario, h: 30 fb-1
nicely covered by enhanced
branching ratio to gauge bosons
hole due to suppressed branching ratio for H to
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 9
Light Higgs Boson h: 300 fb-1
large area covered by several channels stable discovery allows parameter
determination
small uncovered region at low mh = 90 to 100 GeV
hstill sensitive in gluophobic scenario due to associated production Wh, tth
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 10
Heavy Neutral Higgs Bosons
large tan region covered by ppbbH/A, H/A
Rate for
bbA, A ~ (tan)4
coverage similar in 3 other scenarios
running bottom quark mass used
ATLAS preliminary
had.had30fb-1
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 11
Charged Higgs Bosons
gbH+-t
H+-
tbqq
low mass: mH+-< mtop
ggttttH+-bWb
30fb-1
WqqH+-
high mass: mH+-> mtop
transition region around mtop
needs revised experimental analysis
running bottom quark mass used
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 12
Overall Discovery Potential: 300 fb-1
whole plane covered in
all four CP conserving
benchmark scenarios
significant area where
only h is observable
Can we distinguish between SM and extended Higgs sectors by parameter measurements?
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 13
SM or Extended Higgs Sectors?
first look using rate measurements from VBF channels (30fb-1)
R = BR(h) BR(hWW)
=|RMSSM-RSM|exp
only statistical errors considered
assume Higgs mass exactly known
Deviation from SM expectation
potential for discrimination seems promising!
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 14
The CPX scenario MSSM Higgs Sector CP conserving at Born level
CP effects via complex couplings in loops: Complex MSSM
trilinear couplings At, Ab
gluino mass Mgluino
MSUSY = 500 GeV, At=Ab=Mgluino=1 TeV, =2TeV, M2=200GeV
Maximal effect in Higgs sector CPX scenario(suggested by Carena, Ellis, Pilaftsis, Wagner, Phys.Lett B495 155(2000))
maximal phase arg(At)=arg(Ab)=arg(Mgluino)=90 degree
large ratio At/msusy
scan of Born level parameter: tan and MH+-
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 15
Phenomenology in the CPX scenario
all H1, H2 and H3 couple to W and Z
sum rule: i gi (ZZHi) = gSM (ZZH)
both H2 and H3 may decay to
H1H1, ZH1,WW, ZZ
mass eigenstates H1, H2, H3
not equal CP eigenstates h,A,H
low mass for H1 (<50 GeV) not
excluded by OPAL(LEP)
H3H2H1
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 16
Light Higgs Boson H1
border of discovery region at low tanb mostly determined by availability of inputs (VBF >110 GeV, ttH and > 70 GeV)
border at low MH+- due to decoupling of H1 from W,Z and t
30 fb-1 300 fb-1ATLAS preliminary
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
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 17
Heavy Neutral and Charged Higgs Bosons
Charged Bosons Heavy Neutral Bosons
coverage similar to CPC scenariosmore complex in low tanregion due to larger number
of decay channels for H2 and H3
ATLAS preliminary
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 18
Overall Discovery Potential
Zoom
covered by taking into account signal overlap from H1 and H2
MH1: < 70 GeVMH2: 105 to 120 GeVMH3: 140 to 180 GeV small masses not studied yet in ATLAS
tiny „hole“ at border of VBF: H1 H2discovery region
ATLAS preliminary
only H1
only H1
M. Schumacher, ATLAS Higgs Interpretation in the MSSM, SUSY04 , Tsukuba 19
Conclusions
Interpretation of ATLAS Higgs searches in 4 CPC benchmark and the CPX scenario have been performed
CPC scenarios: whole tan vs. MA plane covered,
“wedge region“: only h observable maybe discrimination between SM and beyond by rate measurements
CPX scenario: uncovered region for now at low MH1
because small masses not investigated in ATLAS yet
results need cross check with CPSUPERH (Lee, Pilafstis et al.)
study different values for complex phases
Thanks for programs and discussions to:
Philip Bechtle, Sven Heinemeyer, Tilman Plehn David Rainwater, Michael Spira, ATLAS Higgs working group, …