the search for higgs bosons
TRANSCRIPT
• This talk came from my PANIC 11 talk on SM Higgs at CMS
• To this I have added more material:
• ATLAS combined SM Higgs result• Tevatron combined SM Higgs result• MSSM Higgs from CMS
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 LHC 2011 4
EPS/PANIC: 1.1 fb-1
Search for SM Higgs is on with the first fb-1
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 slide topic 5
• large radius tracking, 4T field• PbWO4 crystal ECAL
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 pileup 6
major challenge in 2011: multiple pp interactions (“pileup”)
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Production 7
[GeV] HM100 200 300 400 500 1000
H+X
) [pb
]
A(p
p m
-210
-110
1
10= 7 TeVs
LHC
HIG
GS
XS W
G 2
010
H (NNLO+NNLL QCD + NLO EW)
App
qqH (NNLO QCD + NLO EW)
App
WH (NNLO QCD + NLO EW)
App
ZH (NNLO QCD +NLO EW)
App
ttH (NLO QCD)
App 20 pb at 120 GeV
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Production 7
[GeV] HM100 200 300 400 500 1000
H+X
) [pb
]
A(p
p m
-210
-110
1
10= 7 TeVs
LHC
HIG
GS
XS W
G 2
010
H (NNLO+NNLL QCD + NLO EW)
App
qqH (NNLO QCD + NLO EW)
App
WH (NNLO QCD + NLO EW)
App
ZH (NNLO QCD +NLO EW)
App
ttH (NLO QCD)
App 20 pb at 120 GeV
vector boson fusion
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Production 7
[GeV] HM100 200 300 400 500 1000
H+X
) [pb
]
A(p
p m
-210
-110
1
10= 7 TeVs
LHC
HIG
GS
XS W
G 2
010
H (NNLO+NNLL QCD + NLO EW)
App
qqH (NNLO QCD + NLO EW)
App
WH (NNLO QCD + NLO EW)
App
ZH (NNLO QCD +NLO EW)
App
ttH (NLO QCD)
App 20 pb at 120 GeV
vector boson fusion
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Decay 8
[GeV]HM100 120 140 160 180 200
Bran
chin
g ra
tios
-310
-210
-110
1bb
oo
cc
gg
aa aZ
WW
ZZ
LHC
HIG
GS
XS W
G 2
010
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Decay 8
[GeV]HM100 120 140 160 180 200
Bran
chin
g ra
tios
-310
-210
-110
1bb
oo
cc
gg
aa aZ
WW
ZZ
LHC
HIG
GS
XS W
G 2
010
WWWW: dominates over wide mass range, clean final state (lνlν)
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Decay 8
[GeV]HM100 120 140 160 180 200
Bran
chin
g ra
tios
-310
-210
-110
1bb
oo
cc
gg
aa aZ
WW
ZZ
LHC
HIG
GS
XS W
G 2
010
WWWW: dominates over wide mass range, clean final state (lνlν)
ZZ
ZZ: three channels, sharp resolution
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Decay 8
[GeV]HM100 120 140 160 180 200
Bran
chin
g ra
tios
-310
-210
-110
1bb
oo
cc
gg
aa aZ
WW
ZZ
LHC
HIG
GS
XS W
G 2
010
WWWW: dominates over wide mass range, clean final state (lνlν)
ZZ
ZZ: three channels, sharp resolution
ττ
ττ: four channels, can use VBF production
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Decay 8
[GeV]HM100 120 140 160 180 200
Bran
chin
g ra
tios
-310
-210
-110
1bb
oo
cc
gg
aa aZ
WW
ZZ
LHC
HIG
GS
XS W
G 2
010
γγ
γγ: small BR, sharp resolution
WWWW: dominates over wide mass range, clean final state (lνlν)
ZZ
ZZ: three channels, sharp resolution
ττ
ττ: four channels, can use VBF production
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Decay 8
[GeV]HM100 120 140 160 180 200
Bran
chin
g ra
tios
-310
-210
-110
1bb
oo
cc
gg
aa aZ
WW
ZZ
LHC
HIG
GS
XS W
G 2
010
γγ
γγ: small BR, sharp resolution
WWWW: dominates over wide mass range, clean final state (lνlν)
ZZ
ZZ: three channels, sharp resolution
ττ
ττ: four channels, can use VBF production
bb mode will play rolein future: boosted Higgs
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ channels 9
Three useful H→ZZ final states:
Z → llZ → ll
Z → llZ →νν
Z → llZ → qq
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 4 l 10
H → ZZ → 4 l• look for best reconstructed Z → ee, μμ (Mll > 60 GeV)• find second lepton pair• baseline selection: MZ2 > 20 GeV• high-mass selection: MZ2 > 60 GeV
• main background: continuum ZZ (estimate from data)
eeee μμμμ eeμμZZ 2.76±0.18 4.10±0.27 6.72±0.45
Z+jets 0.37±0.07 0.06±0.01 0.39±0.07
Z+bb,cc, tt 0.01±0.02 0.01±0.01 0.02±0.02
H (200 GeV) 0.82±0.01 1.16±0.01 1.91±0.02
observed 3 6 6
baseline
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 4 l 11
H → ZZ → 4 l
eeee μμμμ eeμμZZ 2.50±0.17 3.55±0.23 6.10±0.40
Z+jets 0.14±0.06 0.004±0.004 0.15±0.06
H (200 GeV) 0.76±0.01 1.08±0.01 1.80±0.02
observed 0 2 6
high-mass
For high-mass selection, see good agreement with ZZ background prediction.
Signal: sharp peak
]2 [GeV/c4lM100 200 300 400 500 600
2Ev
ents
/10
GeV
/c
-210
-110
1
DATA
Z+jets
ZZ2=250 GeV/cHm2=200 GeV/cHm2=150 GeV/cHm
CMS Preliminary 2011 -1 = 7 TeV L = 1.13 fbs
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 4 l 12
H → ZZ → 4 l
]2 [GeV/cHM200 300 400 500 600
SMσ/
σ95
% C
L lim
it on
0
5
10
15
20
25 Observed LimitSCL Expected LimitSCL
σ 1± Expected SCLσ 2± Expected SCL
SMσ / σ
CMS preliminary 2011 = 7 TeVs at -11.13 fb
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 2l 2ν 13
H → ZZ → 2 l 2ν
• two opposite-sign leptons, |Mll-MZ| < 15 GeV• MET > 69-170 GeV (slides up with MH)
ee μμ
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 2l 2ν 14
H → ZZ → 2 l 2ν
• two opposite-sign leptons, |Mll-MZ| < 15 GeV• MET > 69-170 GeV (slides up with MH)• MT window cut (slides up with MH)
ee μμ
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 2l 2ν 15
H → ZZ → 2 l 2ν
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 2l 2j 16
H → ZZ → 2 l 2j
[GeV]ZZm200 300 400 500 600 700
Eve
nts
/ 20
GeV
0
20
40
60
80
100
120
140-1CMS Preliminary 2011, 1.0 fb = 7 TeVs
Sideband Extrapolated Fit
0 b-tag 2l2q data
Z + Jets
tt/tW
ZZ/WZ/WW
3×400 GeV SM Higgs
[GeV]ZZm200 300 400 500 600 700
Eve
nts
/ 20
GeV
0
5
10
15
20
25-1CMS Preliminary 2011, 1.0 fb = 7 TeVs
Sideband Extrapolated Fit
2 b-tag 2l2q data
Z + Jets
tt/tW
ZZ/WZ/WW
3×400 GeV SM Higgs
[GeV]ZZm200 300 400 500 600 700
Eve
nts
/ 20
GeV
0
20
40
60
80
100
120
140
160
-1CMS Preliminary 2011, 1.0 fb = 7 TeVs
Sideband Extrapolated Fit
1 b-tag 2l2q data
Z + Jets
tt/tW
ZZ/WZ/WW
3×400 GeV SM Higgs
0 b tag 1 b tag 2 b tag
• two opposite-sign leptons 70 < Mll < 110 GeV• two jets 75 < Mjj < 105 GeV• MZZ ∈ [183,800] GeV
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ZZ → 2l 2j 17
H → ZZ → 2 l 2j
[GeV]HM250 300 350 400 450 500 550 600
SMσ
/ 95
%σ
024
68
101214
161820
ObservedSCL ExpectedSCL
σ 1± Expected SCLσ 2± Expected SCL
SM
CMS preliminary 2011 = 7 TeVs at -11.0 fb
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → WW → 2l 2ν 18
• in H → WW decays the W spins are anti-aligned:
• in the decays of both W’s to lν, the leptons tend to come out in the same direction
H WW⇒ ⇐
νν
l
l
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → WW → 2l 2ν 19
• in H → WW decays the W spins are anti-aligned:
• in the decays of both W’s to lν, the leptons tend to come out in the same direction
• use this and other kinematic variables in BDT
H WW⇒ ⇐
νν
l
l
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → WW → 2l 2ν 20
WW + 0 jets category
]$ [ll
q6
0 50 100 150
$en
tries
/ 7
0
20
40
60
80CMS preliminary data
=130H m
WW
Z+jets
top
WZ/ZZ
W+jets
-1L = 1.1 fb
]2 [GeV/cllm
0 50 100 150 200
2en
tries
/ 5
GeV
/c
0
20
40
60CMS preliminary data
=130H m
WW
Z+jets
top
WZ/ZZ
W+jets
-1L = 1.1 fb
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → WW → 2l 2ν 21
WW + 1 jets category
]$ [ll
q6
0 50 100 150
$en
tries
/ 14
0
20
40
60 CMS preliminary data=130H m
WW
Z+jets
top
WZ/ZZ
W+jets
-1L = 1.1 fb
]2 [GeV/cllm
0 50 100 150 200
2en
tries
/ 10
GeV
/c
0
20
40
60CMS preliminary data
=130H m
WW
Z+jets
top
WZ/ZZ
W+jets
-1L = 1.1 fb
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11
MVA Output-1 -0.5 0 0.5 1
entri
es
0
20
40
CMS preliminary data=150H m
WW
Z+jets
top
WZ/ZZ W+jets
-1L = 1.1 fb
MVA Output-1 -0.5 0 0.5 1
entri
es
0
20
40
CMS preliminary data=150H m
WW
Z+jets
top
WZ/ZZ W+jets
-1L = 1.1 fb
H → WW → 2l 2ν 22
also split into same-flavor and opposite-flavor:
opposite flavor(WW+0 jets)
same flavor(WW+0 jets)
also include WW + 2 jets channel...
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → WW → 2l 2ν 23
)2Higgs boson mass (GeV/c120 140 160 180 200 220 240
SMσ/
95%
σ lim
it S
CL
1
10
ExpectedSCLσ 1± Expected SCLσ 2± Expected SCL
ObservedSCL
-1 = 1.1 fbint WW combined, L→H = 7 TeVsCMS Preliminary,
)2Higgs boson mass (GeV/c120 140 160 180 200 220 240
SMσ/
95%
σ lim
it S
CL
1
10
ExpectedSCLσ 1± Expected SCLσ 2± Expected SCL
ObservedSCL
-1 = 1.1 fbint
WW combined (cuts), L→H = 7 TeVsCMS Preliminary,
cut based BDT based
Exclude SM Higgs in range 150 < MH < 193 GeV
“Interesting” excess in low mass range!
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → γγ 24
H → γγ
• e.m. calorimeter designed with this mode in mind!• γγ resolution: 2.4 GeV
event selection• two photons with at least 40, 30 GeV pT
• choose vertex based on PV tracks or conversions
• 8 classes: barrel/endcap ⊗ pTγγ > 40 GeV ⊗ iso (R9)
(H) (GeV/c)T
p0 50 100 150 200
Frac
tion
of v
ertic
es0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
=5.6〉PUn〈SimulationCMS preliminary
| < 10 mmsim-zreco|z
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → γγ 25
)2 (GeV/cγ γm80 90 100 110 120 130 140 150 160 170 180
)2Ev
ents
/ (2
GeV
/c
0
100
200
300
400
500Data
γ2 prompt
γ 1 fake γ1 prompt γ2 fake
Drell-Yan
-1 = 7 TeV L = 1.09 fbsCMS preliminary
)2 (GeV/cγγm100 110 120 130 140 150
)2Ev
ents
/ ( 1
GeV
/c0
50
100
150
200
250DataBkg Modelσ1 ±σ2 ±
-1 = 7 TeV L = 1.09 fbsCMS preliminary
All Categories Combined
zoomed in, compared with background fit
mass spectrum showing background sources
signalshape
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → γγ 26
110 115 120 125 130 135
SM)aa
A(H
m/95
%CL
)aa
A(H
m
2
4
6
8
10
12
14
SMm
Observed CLs LimitObserved Bayesian LimitMedian Expected CLs Limit
Expected CLsm 1( Expected CLsm 2(
-1 = 7 TeV L = 1.09 fbsCMS preliminary
140mH (GeV/c2)
expected limit at ~4x SM
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ττ 27
Main focus of H → ττ: MSSM Higgs at large tanβ
Can exploit VBF production of SM Higgs by requiring two forward “tagging” jets in addition to tau decay channels (eτ, μτ, eμ, μμ)
e- νν 17.8%μ- νν 17.4%h-ν 49%
π- ν 11% K- ν 0.7% ρ- ν 25.4%h+h-h-ν 15%
Tau ID classes: π±/K±
π± π0
π± π0 π0 ...
π+ π- π±
(GeV/c)T
pτgenerated visible 0 20 40 60 80 100 120 140
effi
cien
cyτ
expe
cted
00.10.20.30.40.50.60.70.80.9
1
HPS looseHPS mediumHPS tight
=7 TeVsCMS Simulation 2010,
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 MSSM H/A/h➝ττ 28
[GeV]vism0 100 200 300 400
Even
ts /
20 G
eV
-110
1
10
210
310
410CMS Preliminary
=7 TeVs -11.1 fb-channelµτµτ
Observedττ→φµµ→Zττ→Z
tt
=20)β=120, tanA
(m
[GeV]vism0 100 200 300 400 500
Even
ts
1
10
210
310CMS Preliminary
=7 TeVs -11.1 fbµτeτ
ττ→φObserved
ττ→ZttElectroweakFakes
=20)β=120, tanA
(m
[GeV]vism0 100 200 300 400 500
Even
ts
10
210
310
410CMS Preliminary
=7 TeVs -11.1 fbhτeτ
ττ→φObserved
ττ→ZttElectroweakQCD
=20)β=120, tanA
(m
[GeV]vism0 100 200 300 400 500
Even
ts
10
210
310
410CMS Preliminary
=7 TeVs -11.1 fbhτµτ
ττ→φObserved
ττ→ZttElectroweakQCD
=20)β=120, tanA
(m
eτ μτ
eμ μμ
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 slide topic 29
[GeV]Am100 150 200 250 300 350 400 450 500
βta
n
0
10
20
30
40
50
60
CMS observed theoryσ1±
CMS expected-1D0 7.3 fb
LEPCMS 2010 observedCMS 2010 expected
95% CL excluded regions
-1CMS Preliminary 2011 1.1 fb
= 1 TeVSUSY
scenario, MmaxhMSSM m
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ττ 30
[GeV]vism0 100 200 300 400
Even
ts /
20 G
eV-110
1
10
210 CMS Preliminary=7 TeVs -11.1 fb
-channelµτµτ
Observed,ττ→(10x)H
µµ→Zττ→Z
tt
=120Hm
eτ μτ
eμ μμ
Here we require two forward jets, tagging the vector boson fusion process
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 H → ττ 31
[GeV]Hm110 120 130 140
SMσ/
95%
CLs
)ττ→
x B
R(H
σ
5
10
15
20
25
30
-1 = 7 TeV, 1.1 fbsCMS preliminary Expected CLs Limit
Observed CLs Limit
expected limit at ~9x SM
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Combining channels 32
[GeV]Hm110 120 130 140
SMσ/
95%
CLs
)ττ→
x B
R(H
σ
5
10
15
20
25
30
-1 = 7 TeV, 1.1 fbsCMS preliminary Expected CLs Limit
Observed CLs Limit
110 115 120 125 130 135
SM)aa
A(H
m/95
%CL
)aa
A(H
m
2
4
6
8
10
12
14
SMm
Observed CLs LimitObserved Bayesian LimitMedian Expected CLs Limit
Expected CLsm 1( Expected CLsm 2(
-1 = 7 TeV L = 1.09 fbsCMS preliminary
140mH (GeV/c2))2Higgs boson mass (GeV/c
120 140 160 180 200 220 240
SMσ/
95%
σ lim
it S
CL
1
10
ExpectedSCLσ 1± Expected SCLσ 2± Expected SCL
ObservedSCL
-1 = 1.1 fbint WW combined, L→H = 7 TeVsCMS Preliminary,
[GeV]HM250 300 350 400 450 500 550 600
SMσ
/ 95
%σ
024
68
101214
161820
ObservedSCL ExpectedSCL
σ 1± Expected SCLσ 2± Expected SCL
SM
CMS preliminary 2011 = 7 TeVs at -11.0 fb
]2 [GeV/cHM200 300 400 500 600
SMσ/
σ95
% C
L lim
it on
0
5
10
15
20
25 Observed LimitSCL Expected LimitSCL
σ 1± Expected SCLσ 2± Expected SCL
SMσ / σ
CMS preliminary 2011 = 7 TeVs at -11.13 fb
Goal: combine results of all six search channels
H→ZZ→4l H→ZZ→2l2ν H→ZZ→2l2j
H→WW→2l2ν H→γγ H→ττ
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Combining channels 33
• form joint likelihood from all channels• include correlated and uncorrelated systematic
uncertainties represented by nuisance parameters• use CLs method to quote final limits• (agrees very well with Bayesian)
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Combining channels 34
These are the first CMS results to exclude a SM Higgs boson!
)2Higgs boson mass (GeV/c100 200 300 400 500 600
SMm/
95%
mLi
mit
1
10
ObservedSCLm 1( Expected SCLm 2( Expected SCL
Bayesian Observed
ObservedSCLm 1( Expected SCLm 2( Expected SCL
Bayesian Observed
-1 = 1.1 fbintCombined, L = 7 TeVsCMS Preliminary, ObservedSCL
m 1( Expected SCLm 2( Expected SCL
Bayesian Observed
-1 = 1.1 fbintCombined, L = 7 TeVsCMS Preliminary,
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Combining channels 34
These are the first CMS results to exclude a SM Higgs boson!
)2Higgs boson mass (GeV/c100 200 300 400 500 600
SMm/
95%
mLi
mit
1
10
ObservedSCLm 1( Expected SCLm 2( Expected SCL
Bayesian Observed
ObservedSCLm 1( Expected SCLm 2( Expected SCL
Bayesian Observed
-1 = 1.1 fbintCombined, L = 7 TeVsCMS Preliminary, ObservedSCL
m 1( Expected SCLm 2( Expected SCL
Bayesian Observed
-1 = 1.1 fbintCombined, L = 7 TeVsCMS Preliminary,
95% CL Excluded
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Combining channels 35
These are the first CMS results to exclude a SM Higgs boson!
)2Higgs boson mass (GeV/c100 200 300 400 500 600
SMσ/
95%
σ li
mit
SC
L
1
10
210 = 7 TeVsCMS Preliminary, Combined)-1 WW (1.1 fb→H )-1 (1.1 fbγγ →H )-1 (1.1 fbττ →H )-1 4l (1.1 fb→ ZZ →H )-1 2l 2q (1.0 fb→ ZZ →H )-1 (1.1 fbν 2l 2→ ZZ →H
Combined)-1 WW (1.1 fb→H )-1 (1.1 fbγγ →H )-1 (1.1 fbττ →H )-1 4l (1.1 fb→ ZZ →H )-1 2l 2q (1.0 fb→ ZZ →H )-1 (1.1 fbν 2l 2→ ZZ →H
Combined)-1 WW (1.1 fb→H )-1 (1.1 fbγγ →H )-1 (1.1 fbττ →H )-1 4l (1.1 fb→ ZZ →H )-1 2l 2q (1.0 fb→ ZZ →H )-1 (1.1 fbν 2l 2→ ZZ →H
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 ATLAS - channels 36
ATLAS - various channel results:
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 CMS vs ATLAS 38
)2Higgs boson mass (GeV/c100 200 300 400 500 600
SMm/
95%
mLi
mit
1
10
ObservedSCLm 1( Expected SCLm 2( Expected SCL
Bayesian Observed
ObservedSCLm 1( Expected SCLm 2( Expected SCL
Bayesian Observed
-1 = 1.1 fbintCombined, L = 7 TeVsCMS Preliminary, ObservedSCL
m 1( Expected SCLm 2( Expected SCL
Bayesian Observed
-1 = 1.1 fbintCombined, L = 7 TeVsCMS Preliminary,
• both experiments exclude 300-450 GeV • CMS excludes 150-200 GeV, other• CMS: better sensitivity (125-425 GeV)• both experiments have low mass excess• ATLAS+CMS combination coming (LP?)
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 ATLAS γγ 39
ATLAS low mass wiggles coming from γγ
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Tevatron combined result 40
Tantalizingly close to SM sensitivity! Exclude 2x SM @ 130 GeV: LHC excess
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Tevatron combined result 40
Tantalizingly close to SM sensitivity! Exclude 2x SM @ 130 GeV: LHC excess
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 Tevatron combined result 40
Tantalizingly close to SM sensitivity! Exclude 2x SM @ 130 GeV: LHC excess
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Exclusion 41
115 120 125 130
Tevatron12 fb-1?
bbLEP LHC
2 fb-1 ?γγ, ττ
uppe
r lim
it/SM
1
2
Tevatron is not out of the game yet - the nextfew months should be interesting! Very schematically:
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Exclusion 41
115 120 125 130
Tevatron12 fb-1?
bbLEP LHC
2 fb-1 ?γγ, ττ
uppe
r lim
it/SM
1
2
Tevatron is not out of the game yet - the nextfew months should be interesting! Very schematically:
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Exclusion 41
115 120 125 130
Tevatron12 fb-1?
bbLEP LHC
2 fb-1 ?γγ, ττ
uppe
r lim
it/SM
1
2
Tevatron is not out of the game yet - the nextfew months should be interesting! Very schematically:
Higgs@ LHC H→ZZ H→ WW H→γγ, ττ Combination
John Conway - KITP - LHC 11 SM Higgs Exclusion 41
115 120 125 130
Tevatron12 fb-1?
bbLEP LHC
2 fb-1 ?γγ, ττ
uppe
r lim
it/SM
1
2
Tevatron is not out of the game yet - the nextfew months should be interesting! Very schematically:
Combining LHC and Tevatron possible...can it happen?