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Latest Results on the Standard Model Higgs in ATLAS
Koji Nakamura (KEK) on behalf of ATLAS collaboration
20th Nov, 2013 1 KEK Seminar
Geneve
Jura
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We had fruitful discussions in Japan
20th Nov, 2013 KEK Seminar 2
Hadron Collider Physics Symposium 2012
Kyoto, Japan
HC2012 - Higgs Coupling 2012 Tokyo in Japan
http://www.icepp.s.u-tokyo.ac.jp/hc2012/
http://www.icepp.s.u-tokyo.ac.jp/hcp2012/
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LHC and ATLAS experiment
20th Nov, 2013 KEK Seminar 3
ATLAS
• 7TeV collisions are Started in March 2010. • Upgraded CM energy to 8TeV in 2012. • Extremely successful operation for these
2.5 years.
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Historical observation
20th Nov, 2013 KEK Seminar 4
Phys.Lett. B716 (2012) 1-29
“These results provide conclusive evidence for the discovery of a new particle with mass 126.0±0.4 (stat)±0.4 (sys) GeV. ”
But what’s the new particle?
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Post Observation
20th Nov, 2013 KEK Seminar 5
ICHEP/Observation
HCP
5.8fb-1
13fb-1
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Post Observation
20th Nov, 2013 KEK Seminar 6
12th July, 2012 KEK seminar
Today’s topic How coupling measurements are started? What are Hττ and bb going on?
We had progress on this.
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Post ICHEP results
• Coupling measurements in Sep 2012 :
• Updated searches for each channels in Nov 2012 :
– (HWW)
– H ττ
– H bb
– (combination)
20th Nov, 2013 KEK Seminar 7
ATLAS-CONF-2012-127
4.6fb-1(7TeV)+13fb-1(8TeV)
Will be updated to : https://twiki.cern.ch/twiki/bin/view/AtlasPublic/HiggsPublicResults
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20th Nov, 2013 KEK Seminar 8
Coupling measurement
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Higgs production and decay @ LHC
Mar 3rd, 2011 Open discussion meeting 9
Gluon Fusion(ggF) Vector Boson Fusion W/Z Associated
Production Decay
All of bb, WW, ττ, γγ, ZZ can be observed!!
tt/bb Associated
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Channels included in the measurement
20th Nov, 2013 KEK Seminar 10
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Signal strength for each channel
20th Nov, 2013 KEK Seminar 11
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Signal strength for each channel
20th Nov, 2013 KEK Seminar 12
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Coupling measurement : Notation
20th Nov, 2013 KEK Seminar 13
All measurements assume mH=126GeV
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Production process dependent μ
20th Nov, 2013 KEK Seminar 14
Gw/z
Yt
Gw/z
= =
= μVBF+VH
= μggF+ttH
VVH coupling in production
qqH coupling in production
We can measure the ratio of Boson and Fermion coupling using different production processes with the same decay mode.
Yt =
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Production process dependent μ
20th Nov, 2013 KEK Seminar 15
Hγγ
HWW
Take a ratio to avoid BR effect :
Hγγ , HWW and combination.
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Coupling with Gauge boson
20th Nov, 2013 KEK Seminar 16
Gw Gz λWZ = κW / κZ =
We saw clear excess on the both WW and ZZ decay channels so meaningful HVV measurement could be presented
Observed :
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Coupling with Fermion
20th Nov, 2013 KEK Seminar 17
May be this is too early to discuss since not yet observed bb and ττ
Up type v.s. down type Lepton v.s. quark
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More global view
20th Nov, 2013 KEK Seminar 18
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New results for each channel
20th Nov, 2013 KEK Seminar 19
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HW(lν)W(lν) channel in ATLAS
• One of the highest sensitivity channel.
• Contributed to the observation a lot.
• May probe production mechanism dependence – VBF HqqWW
– VHVWW
– ttHttWW
• Analysis is assuming/using spin 0, this means that it’s quite sensitive to the spin measurement.
20th Nov, 2013 KEK Seminar 20
For HCP, only different flavor leptons channels with 0/1jet are updated.
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Event selection & background estimation • two leptons + Missing ET
• ggF : 0,1 jet
Mar 3rd, 2011 Open discussion meeting 21
Sign
al
regi
on
WW control region W+jets/Wγ* : Fake lepton background. Prepare Loose lepton CR And multiplied by Fake rate.
WW: Normalized by WW control region.
Top : Apply b-tagging to enhance ttbar background.
Z+jets : MET vs mll Mainly for met correction.
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HWW results.
20th Nov, 2013 KEK Seminar 22
0jet 1jet
Close to 3σ !
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Hbb searches in ATLAS
20th Nov, 2013 KEK Seminar 23
0 lepton 1 lepton 2 lepton
Show the results with 4.6fb-1(7TeV) and 13fb-1 (8TeV) data
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Background and estimation
20th Nov, 2013 KEK Seminar 24
0 lepton 1 lepton 2 lepton
Shapes are obtained by MC and normalized to data by Control region. Multi-jet background was determined by data-driven way. WZ/ZZ(Zbb) resonant backgrounds fully rely on the MC.
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High sensitivity categories
20th Nov, 2013 KEK Seminar 25
0 lepton 1 lepton 2 lepton
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After background subtraction
20th Nov, 2013 KEK Seminar 26
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Results : combined limit and p0
20th Nov, 2013 KEK Seminar 27
• Calculated limit and significance using MMC distribution as the discriminant. • To extract signal, Profile likelihood was used.
Expected:1.9xSM Observed:1.8xSM Expected:15% Observed:64% (μ=0) (μ=1)
Best fit value of Signal Strength (μ) is -0.4±0.7±0.8
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Hττ searches in ATLAS
13th Nov, 2012 HCP 2012 28
• Three Higgs production processes are considered in this analysis.
•
• Separate analysis for three different ττ decay mode.
– lep-lep = ll4ν : (ee)+eμ+μμ – lep-had = lτhad3ν : eτhad+ μτhad – had-had = τhadτhadνν : (τhadτhad)
• Combined all three channels to search for Hττ signature. Show the results with 4.6fb-1(7TeV) and 13fb-1 (8TeV) data
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Di-tau Mass reconstruction
13th Nov, 2012 HCP 2012 29
• Solve τ, ETmiss in Δφ(τvis,ν)
parameter space using Δθ3D(τvis,ν) template from simulation as PDF.
Missing Mass Calculator(MMC)
Need… Event by Event estimator of true di-τ mass likelihood. Full reconstruction of event kinematics.
Di-tau invariant mass should be a important discriminating variable from backgrounds. But having 2-4ν in a events.
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Background and estimation
13th Nov, 2012 HCP 2012 30
• Opposite sign tau decay products are required.
• High Missing ET and low MT cuts are added.
QCD and W+Jets – Estimated from Same Sign events(lephad) -- Template fit by loose selection (lep-lep,hadhad)
Zee/μμ + jets, Top, di-boson Estimated by MC with correction.
Zττ estimated by embedding+MC -- used Zμμ data and replace μ by full simulated τ, so that all the objects except tau decay product are obtained by real data. -- Used high statistics MC for VBF channel with correction by data.
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Z(ττ)+jets modeling validation
13th Nov, 2012 HCP 2012 31
Higgs Signal is on the right hand side tail of Z. Need carful varidation of the Zττ shape.
Non-VBF channel : Embedding Checked with MC sample Assigned systematics by varying condition. VBF channel : High statistics MC Jet kinematics are validated by Zee/μμ data. Reweighted kinematics for MC mismodeling.
MMC distribution embedding vs MC
MET distribution. estimation vs data
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Results: discriminant distributions
20th Nov, 2013 KEK Seminar 32
leplep lephad hadhad
2xSM signal 1xSM signal 5xSM signal
ggF
sen
siti
ve c
han
nel
s V
BF
sen
siti
ve c
han
ne
ls
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Results : combined limit and p0 • Calculated limit and significance using MMC distribution as the discriminant. • To extract signal, Profile likelihood was used.
13th Nov, 2012 HCP 2012 33
Expected:1.2xSM Observed:1.9xSM Expected:1.7σ Observed:1.1σ (μ=0) (μ=1)
Best fit value of Signal Strength (μ) is 0.7 ±0.7
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Summary of production dependence
• H ττ result.
20th Nov, 2013 KEK Seminar 34
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Summary of production dependence
20th Nov, 2013 KEK Seminar 35
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What we achieved post-observation
20th Nov, 2013 KEK Seminar 36
Observation paper HCP preliminary
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We observed something in July
• Indeed the observation was clear! (6σ)
20th Nov, 2013 KEK Seminar 37
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• Indeed the observation was clear! (6σ)
• But still not sure what it is.
We observed something in July
20th Nov, 2013 KEK Seminar 38
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With full data in 2012
20th Nov, 2013 KEK Seminar 39
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LHC after 2yr shutdown
20th Nov, 2013 KEK Seminar 40
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Open question : next generation exp.
20th Nov, 2013 KEK Seminar 41
How easy to see who is sitting on the plane ? Do we have enough motivation for the cost?
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backup
20th Nov, 2013 KEK Seminar 42
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20th Nov, 2013 KEK Seminar 43
Other measurement
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20th Nov, 2013 KEK Seminar 44
Loop coupling : photon and gluon Higgs decaying to invisible particles.
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Systematic Uncertainties. • Systematic uncertainties for Zττ background and Signal. • Dominant systematics are Embedding, Tau Energy Scale
and Jet Energy Scale. Both Shape and Normalization variation are taken into account.
13th Nov, 2012 HCP 2012 45