Extended Scalar Searches at ATLAS & CMS Allison McCarn - - PowerPoint PPT Presentation

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Extended Scalar Searches at ATLAS & CMS

Allison McCarn (University of Michigan) On behalf of the CMS and ATLAS Collaborations

!

Rencontres de Moriond EW 2016

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Beyond the Standard Model

The observed Higgs boson at 125 GeV could be only the beginning.

!

A few examples out of many…

Two-Higgs Double Models (2HDM):

Additional Higgs Doublet gives rise to 5 Higgs bosons (H,h,A,H±)

Higgs Triplet:

An additional scalar triplet results in charged, doubly-charged, and neutral bosons.

2HDM+S: Two Higgs Doublets and an additional complex singlet (e.g. NMSSM) Minimal Supersymmetric Standard Model: Higgs Sector is Type-II

• 2HDM. Current

common benchmark is hMSSM.

2

Electroweak Singlet (EWS): Additional singlet, resulting in 2 CP-even bosons.

BSM physics was not observed in run-1, but there are still many possible models to be investigated in run-2.

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Run-1 Results/Run-2 Prospects

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• Many searches were performed in run-1,

with 7 and 8 TeV centre-of-mass energy at the LHC, but physics beyond the Standard Model has not yet been observed.

!

• An example of where we stand and hopes

for the future of the LHC can be seen in the hMSSM overlay and prospect plots.

– Much parameter space is excluded, but there is still room for high mass Higgs to be found!

Djouadi et al: hMSSM (arXiv:1502.05653)

• Phys. Rev. D 92, 092004 (2015)

In 2015, ATLAS collected 3.2 fb-1 and CMS collected 2.8 fb-1 of data at 13 TeV!

!

This is already enough in many cases to exceed run-1 sensitivity!

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Beyond the Standard Model Searches in this Presentation

Charged Higgs

H±àτν (13 TeV) H±àtb (8 TeV) φ±±φ±±àlllν/4l (8 TeV)

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Many searches for run-2, as well as a few final searches for run-1, from ATLAS, CMS, and both. Neutral Higgs Hàττ (13 TeV) Higgs-to-Higgs Hà2a (8 TeV) HàZA (13 TeV) AàZh(125) (13 TeV) Di-Higgs Hàhhàbbγγ (13 TeV) Hàhhàbbττ (8/13 TeV) Dibosons

HàZZà4l (13 TeV) HàZZàllνν (13 TeV) Boosted Resonances (13 TeV) HàZZàllqq (13 TeV) ZH, Hàinv (13 TeV) XàZγ (13 TeV)

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Recent √s = 8 TeV Results

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• In a 2HDM+S model, there are 2

singlet states:

– CP-odd scalar a – CP-even s

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• BR(hàBSM) < 0.34, so the decay to

2a can be sizeable.

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• Recent results from CMS for

hà2aà2b2μ and hà2aà2μ2τ!

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2HDM+S: Search for h(125) à2a

Current channels include: hà2aà2b2μ (CMS-PAS-HIG-14-041) hà2aà4μ (CMS:Phys. Lett. B 752 (2016) 221) hà2aà2μ2τ (CMS-PAS-HIG-15-011, ATLAS:Phys. Rev. D92 (2015) 052002) hà2aà4τ (CMS-PAS-HIG-14-022, CMS:JHEP 01 (2016) 079) hà2aà4γ (ATLAS:CERN-PH-EP-2015-187)

Summary plot of μ/τ channels

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hà2aà2b2μ:

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2 b-jets, 2 μ, ET

miss significance < 6

|Mbbμμ - 125|< 25 GeV

!

Signal Modeling: Weighted sum of Voigt profile and Crystal ball. Background Modeling: Polynomial functions, fit to mμμ in data.

!

hà2aà2μ2τ

!

5 final states: μμτeτe, μμτμτe, μμτhadτe, μμτhadτμ, μμτhadτhad

!

|Mττμμ - 125|< 25 GeV (Mμμ – Mττ)/Mμμ < 0.8 |Mvis

eeμμ- 125| > 15 GeV

!

Irreducible backgrounds from MC, reducible from data-driven methods.

CMS-PAS-HIG-14-041 CMS-PAS-HIG-15-011

2HDM+S: Search for h(125) à2a

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2HDM: Search for H± àtb

Predicted in models with extended Higgs Sector (e.g. 2HDM):

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✓ H± dominantly produced in association with a top quark.

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✓ H±àtb is a dominant decay mode for heavy H±. Search in lepton+jets final state. Fit is performed on 5 regions:

• HT

had in 4 Control Regions: [4j(2b),

5j(2b), ≥6j(2b), 4j(≥3b)]

• BDT in 1 Signal Region: [≥5j(≥3b)

[GeV]

+

H

m 200 250 300 350 400 450 500 550 600 tb) [pb] →

+

)xBR(H

+

tH → (gb σ

• 1

10 1 10

Observed limit (CLs) Expected limit (CLs) σ 1 ± σ 2 ± xBR=1.65 pb σ =300 GeV,

+ H

m

• Exp. limit with injected signal

=0.5 β tan

mod- h

xBR m σ =0.7 β tan

mod- h

xBR m σ =0.9 β tan

mod- h

xBR m σ

ATLAS

• 1

=8 TeV, 20.3 fb s (tb)

+

tH → gb

ATLAS:CERN-PH-EP-2015-290

BDT includes Ht

had, lead jet pT, mbb of 2 b-jets

closest in ΔR, second Fox-Wolfram moment, and average ΔR between all b-jet pairs.

CMS: JHEP 11 (2015) 018

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Higgs Triplets: Search for H±±

CMS-PAS-HIG-14-039

• H±± is predicted by models

with a Higgs triplet.

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• This search is for

associated production or pair-produced left-handed H±± into 3 or 4 leptons, respectively.

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[GeV]

X

m

300 400 500 600 700 800 900 1000

HH) [pb] → BR(X × X) → (pp σ

• 2

10

• 1

10 1 10

Observed 95% upper limit Expected 95% upper limit σ 1 ± Expected limit σ 2 ± Expected limit = 3 TeV)

R

Λ radion ( = 1 TeV)

R

Λ radion (

= 8 TeV s at

• 1

, 18.3 fb τ τ bb → CMS Preliminary, HH

200 300 400 500 600 700 800 900 1000 1100 1200

[1/GeV]

HH

dN/dm

5 −

10

4 −

10

3 −

10

2 −

10

1 −

10 1

τ τ bb → HH → X Observed τ τ → Z t t Electroweak Multijets SM Higgs Uncertainty

CMS Preliminary

(8 TeV)

• 1

18.3 fb

2jet2tag Resonant

[GeV]

HH

m

200 400 600 800 1000 1200

Simulation Data - Simulation

1 2

200 300 400 500 600 700 800 900 1000 1100 1200

[1/GeV]

HH

dN/dm

4 −

10

3 −

10

2 −

10

1 −

10 1 10

τ τ bb → HH → X Observed τ τ → Z t t Electroweak Multijets SM Higgs Uncertainty

CMS Preliminary

(8 TeV)

• 1

18.3 fb

2jet1tag Resonant

[GeV]

HH

m

200 400 600 800 1000 1200

Simulation Data - Simulation

1 2

200 300 400 500 600 700 800 900 1000 1100 1200

[1/GeV]

HH

dN/dm

3 −

10

2 −

10

1 −

10 1 10

2

10

τ τ bb → HH → X Observed τ τ → Z t t Electroweak Multijets SM Higgs Uncertainty

CMS Preliminary

(8 TeV)

• 1

18.3 fb

2jet0tag Resonant

[GeV]

HH

m

200 400 600 800 1000 1200

Simulation Data - Simulation

1 2

10

CMS-PAS-HIG-15-013

Scalar Resonance: Hàhhàbbτhadτhad

ATLAS: Phys. Rev. D 92, 092004 (2015)

2 hadronic τhad and 2 jets 80 < mττ < 140 GeV and 80 < mjj < 170 GeV mHH calculated using a kinematic fit

!

Backgrounds Multi-jet: Data-driven methods Z/γ∗ àτhadτhad: Embedding of µµ data events Others: Simulation

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Fit to three regions with 0, 1, or 2 b-tagged jets. See Seth Zenz’s talk for non-resonant analysis.

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Higgs to Fermions √s = 13 TeV Searches: Fermionic Decays

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Search for H± àτν

H± predicted in 2HDM/MSSM:

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✓ H± dominantly produced in association with a top quark.

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✓ H±àτν decay channel represents a clean signature and substantial BR (~10%) in several MSSM benchmarks.

Search is for the decays: with the final discriminating variable:

CERN-PH-EP-2016-056

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[GeV]

+

H

m 200 400 600 800 1000 1200 1400 1600 1800 2000 ) [pb] ν

+

τ →

+

BR(H × )

+

[b]tH → (pp σ

2 −

10

1 −

10 1 Observed (CLs) Expected (CLs) σ 1 ± σ 2 ± =60 β hMSSM tan

+

H ATLAS Preliminary

• 1

= 13 TeV, 3.2 fb s

Event Selection

ET

miss trigger

≥3 jets including ≥1 b-tagged jet 1 τ and no e or μ ET

miss > 150 GeV

mT > 50 GeV

Search for H± àτν

Backgrounds:

• Jet → τ fakes (multi-jet: data-driven)
• Events with true τ (tt, W+jets: from MC,

validated in CR)

• Events with lepton → τ fakes (top, 


V+jets, diboson: Shape from MC, norm. from data. ~5% of background.)

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[GeV]

+

H

m 200 220 240 260 280 300 320 340 360

• tan

20 25 30 35 40 45 50 55 60

Observed exclusion Expected exclusion

• 1

±

• 2

± Run 1 result Observed Expected

ATLAS Preliminary

• 1

= 13 TeV, 3.2 fb s ; hMSSM scenario

• +

H

CERN-PH-EP-2016-056

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Final discriminant in both channels

Search for H/A àττ

τlepτhad Event Selection

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Single lepton triggers 1 τ and 1 OS e/μ and Δφ(τ, e/μ ) > 2.4 MT(e/μ, MET) < 40 GeV or > 150 GeV In e-channel: mvis < 80 and > 110 GeV

τhadτhad Event Selection

!

Single τhad trigger 2 τhad with OS charge Δφ(τhad,1, τhad,2 ) > 2.7

Hàττ provides sensitivity in MSSM at high tanβ, and in 2HDM at the alignment limit. Analysis targets two channels with different τ decay modes.

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ATLAS-CONF-2015-061

SLIDE 15

No evidence for BSM Higgs, but sensitivity already exceeds run-1.

Search for H/A àττ

15

Backgrounds

!

✓ True τ backgrounds (e.g. Zàττ, tt) are taken from simulation.

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✓ Jetàτ backgrounds (e.g. W+jets, multi-jets) are estimated using data-driven methods. ATLAS-CONF-2015-061 gluon fusion b-associated

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√s = 13 TeV Searches: Di-Higgs

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Search for Hàhhàbbγγ

hh production can be resonantly enhanced by many BSM models (Singlet, MSSM, etc.).

!

• bbγγ chosen due to high BR(hàbb) and clean

γγ signature.

• ATLAS has also searched for hhà4b, covered

in Max Bellomo’s talk tomorrow.

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Event Selection

2γ within 105 < mγγ < 160 GeV 2 central jets within 95 < mjj < 135 GeV 2 (0) b-tag as SR (CR) at 85% efficiency bb 4-momenta scaled by mh/mbb |mγγ – mh| < 2σ(mγγ) Mbbγγ within window of 95% signal efficiency ATLAS-CONF-2016-004

See Seth Zenz’s talk for non- resonant analysis.

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[GeV]

kinfit H

m

300 400 500 600 700 800 900 1000

[1/GeV]

kinfit H

dN/dm

4 −

10

3 −

10

2 −

10

1 −

10 1 10

2

10

CMS

preliminary (13 TeV)

• 1

2.7 fb Data t t QCD Drell-Yan Other bkg.

• bkg. uncertainty

= 800 GeV

H

m = 450 GeV

H

m = 300 GeV

H

m

hh) = 10 pb → BR (H × H) → (pp σ

h

τ bb e channel

[GeV]

kinfit H

m

300 400 500 600 700 800 900 1000

[1/GeV]

kinfit H

dN/dm

4 −

10

3 −

10

2 −

10

1 −

10 1 10

2

10

CMS

preliminary (13 TeV)

• 1

2.7 fb Data t t QCD Drell-Yan Other bkg.

• bkg. uncertainty

= 800 GeV

H

m = 450 GeV

H

m = 300 GeV

H

m

hh) = 10 pb → BR (H × H) → (pp σ

h

τ µ bb channel

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Search for Hàhhàbbττ

CMS-PAS-HIG-16-013

τhadτμ τhadτe

Backgrounds

!

• Multi-jet: estimated using data-driven

methods

!

• Z+jets: MC corrected using data control

regions.

!

• tt: MC, shape corrected by top pT reweighting.

!

• Others (W+jets, single top, diboson) from MC.

Search for three channels:
 τhadτμ, τhadτe and τhadτhad

!

Exactly two OS objects, as above 2 b-tagged jets

!

Final mass variable mH constructed using a kinematic fit.

SLIDE 19

[GeV]

H

m

300 400 500 600 700 800 900

) [pb] τ τ bb → hh → BR (H × H) → (pp σ 95% CL limit on

2 −

10

1 −

10 1 10

Observed CLs Expected CLs σ 1 ± Expected σ 2 ± Expected

CMS

preliminary (13 TeV)

• 1

2.7 fb

h

τ

h

τ + bb

h

τ + bb e

h

τ µ bb combined channels

[GeV]

kinfit H

m

300 400 500 600 700 800 900 1000

[1/GeV]

kinfit H

dN/dm

4 −

10

3 −

10

2 −

10

1 −

10 1 10

2

10

CMS

preliminary (13 TeV)

• 1

2.7 fb Data t t QCD Drell-Yan Other bkg.

• bkg. uncertainty

= 800 GeV

H

m = 450 GeV

H

m = 300 GeV

H

m

hh) = 10 pb → BR (H × H) → (pp σ

h

τ

h

τ bb channel

Backgrounds

!

• Multi-jet: estimated using data-driven

methods

!

• Z+jets: MC corrected using data control

regions.

!

• tt: MC, shape corrected by top pT reweighting.

!

• Others (W+jets, single top, diboson) from MC.

19

Search for three channels:
 τhadτμ, τhadτe and τhadτhad

!

Exactly two OS objects, as above 2 b-tagged jets

!

Final mass variable mH constructed using a kinematic fit.

τhadτhad

CMS-PAS-HIG-16-013

See Seth Zenz’s talk for non- resonant analysis.

Search for Hàhhàbbττ

SLIDE 20

√s = 13 TeV Searches: Higgs to Bosons

20

SLIDE 21

GeV

X

m

200 300 400 500 600 700 800 900 1000

σ฀(gg→ X→ ZZ→ 4)fb

1 10

2

10

Preliminary CMS

(13 TeV)

• 1

2.8 fb

Observed 95% CLs Γ=0, expected ± 1 sd. Γ=0, expected ± 2 sd. Γ = 5 GeV Γ = 20 GeV Γ = 40 GeV

Search for HàZZà4l

The 4l final state gives a clean signature with low background, predicted in EWS and 2HDM. The search is for a resonance of mH = 140 (200)-1000 GeV for CMS (ATLAS).

21

ATLAS-CONF-2015-059 CMS-PAS-HIG-15-004

[GeV]

S

m 200 300 400 500 600 700 800 900 1000 )[fb] l 4 → ZZ → BR(S × σ 95% Limit on 1 10

2

10

Expected Observed σ 1 ± σ 2 ±

ATLAS Preliminary

• 1

13 TeV, 3.2 fb

l 4 → ZZ → S

Search is based on selection from h(125) àZZà4l analysis.

SLIDE 22

Search for HàZZà4l

The results have also been interpreted in Type-I and Type-II 2HDM.

22

Search is based on selection from h(125) àZZà4l analysis.

CMS-PAS-HIG-15-004

(GeV)

H

m

150 200 250 300 350 400 450 500

β tan

0.5 1 2 3 4 5 6 7 8 9 10

• Obs. 95% CL limit
• Exp. 95% CL limit

4l (HIG-15-004) → ZZ → H Non-perturbative region

(13 TeV)

• 1

2.8 fb )=0.1 α

• β

2HDM Type I, cos( + 100 GeV

H

= m

±

H

= m

A

m

CMS

Preliminary (GeV)

H

m

150 200 250 300 350 400 450 500

β tan

0.5 1 2 3 4 5 6 7 8 9 10

• Obs. 95% CL limit
• Exp. 95% CL limit

4l (HIG-15-004) → ZZ → H Non-perturbative region

(13 TeV)

• 1

2.8 fb )=0.1 α

• β

2HDM Type II, cos( + 100 GeV

H

= m

±

H

= m

A

m

CMS

Preliminary

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Events / 40 GeV

2 −

10

1 −

10 1 10

2

10

3

10

4

10

5

10

Data t t Z + jets WZ ZZ → qq Single Top ZZ → gg WW Triboson VV t V+t t t W + jets

• Stat. Unc.

ATLAS Preliminary

• 1

= 13TeV, 3.2 fb s 3l control region

[GeV]

miss T

E

100 200 300 400 500 600 700 800

Data/SM Pred.

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

Missing transverse energy [GeV]

100 200 300 400 500

Events / GeV

3 −

10

2 −

10

1 −

10 1 10

2

10

3

10

4

10

5

10

6

10

7

10 data

• Instr. MET

Top/W/WW ZVV WZ ZZ ggH(400) qqH(400) ggH(750) qqH(750) ggH(1000) qqH(1000)

• Stat. Unc.

Syst + Stat. 100 200 300 400 500

Bkg. Σ Data/

0.4 0.6 0.8 1 1.2 1.4 1.6

(13 TeV)

• 1

2.3 fb

CMS

Preliminary

23

Searching for an additional scalar boson, as predicted in EWS/2HDM. The search is for a narrow resonance of mH = 300-1000 GeV (ATLAS) or 200-1500 GeV (CMS).

In both cases, search is for 2 leptons (e or μ) and high ETmiss

Backgrounds

!

✓ ZZ/WZ: From simulation, WZ scaled using data- driven methods (ATLAS) ✓ Others: Predicted using data-driven methods.

ATLAS:WZ Control Region CMS: Data-driven Z+jets prediction

Search for HàZZàllνν

CMS-PAS-HIG-16-001

6

SLIDE 24

Search for HàZZàllνν

24

Event Selection

2 same flavor, opposite sign charge leptons 76 < mll < 106 GeV and ET

miss > 120 GeV

ΔRll < 1.8 and Δφ(Z, ET

miss) > 2.7

Fractional pT difference < 0.2 Δφ(jet (pT > 100 GeV), ET

miss) > 0.4

ZPT/MT < 0.7 and no b-jet

!

Final Discriminant:

!

[GeV]

H

m 300 400 500 600 700 800 900 1000 ZZ) [fb] → * BR(H

ggF

σ 95% Limit on 1 10

2

10

3

10

4

10

5

10

6

10

Expected Median σ 1 ± Expected σ 2 ± Expected Observed

ATLAS Preliminary

• 1

13TeV, 3.2 fb

ν ν ll → ZZ → H

Events / 50 GeV

2 −

10

1 −

10 1 10

2

10

3

10

4

10

5

10

Data ggF H (300 GeV) ggF H (600 GeV) ggF H (1000 GeV) ZZ → qq WZ ZZ → gg )+jets µ µ Z(ee/ )+jets/WW τ τ /Wt/Z( t t Triboson VV t V/t t t Fake Lepton

• Syst. Unc.

⊕ Stat.

ATLAS Preliminary

• 1

= 13TeV, 3.2 fb s ν ν ll → ZZ → H

[GeV]

ZZ T

m

200 400 600 800 1000 1200 1400

Data/SM Pred.

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

6

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25

CMS-PAS-HIG-16-001

Event Selection 2 same flavor, opposite sign charge leptons ET

miss > 125 GeV and Δφ(nearest jet, ET miss) > 0.5

No b-tagged jets

!

3 Signal Region Categories: VBF: ≥ 2 forward jets with |Δη| > 4 and m > 500 GeV. ≥ 1 jets: at least 1 jet, fails VBF = 0 jets: No jets.

!

Final Discriminant:

! !

EWS, 
 VBF production

Search for HàZZàllνν

SLIDE 26

• Several diboson resonance searches in ATLAS have also been interpreted in terms
• f a heavy Higgs-like boson.

– For details of the analyses, see Max Bellomo’s talk Thursday.

!

• Limits are set up to 3 TeV:
• For HàWWàlνqq, HàZZàllqq and HàZZàννqq
• In the narrow width approximation, as well as for widths ranging from 5-15%.
• No evidence for boosted scalar resonances has been found in any channel.

26

Boosted Diboson Resonances

ATLAS-CONF-2015-075 ATLAS-CONF-2015-071 ATLAS-CONF-2015-068 HàWWàlνqq HàWWàlνqq

SLIDE 27

27

Merged Analysis

!

2 same flavor leptons and 1 large-R jet (pT > 200 GeV) consistent with Z decay PT(ll) > 0.3mll

!

Resolved Analysis

!

2 same flavor leptons and 2 small-R jets consistent with Z decay

! !

Two categories: 2 and <2 b-tagged jets

Search for HàZZàllqq

10−3 10−2 10−1 1.0 101 102 103 Events / GeV ATLAS Preliminary √s = 13 TeV, 3.2 fb−1 X → ZZ → ``qq Merged SR Data NWA H (750 GeV) Z + jets SM Diboson Top Quarks Stat.LSyst. Uncert. Pre-fit background 200 400 600 800 1000 1200 m(``J) [GeV] 0.5 1.0 1.5 Data/Pred 10−3 10−2 10−1 1.0 101 102 103 104 Events / GeV ATLAS Preliminary √s = 13 TeV, 3.2 fb−1 X → ZZ → ``qq Untagged Resolved SR Data NWA H (750 GeV) Z + jets Top Quarks SM Diboson Stat.LSyst. Uncert. Pre-fit background 200 400 600 800 1000 1200 m(``jj) [GeV] 0.5 1.0 1.5 Data/Pred 10−3 10−2 10−1 1.0 101 102 103 Events / GeV ATLAS Preliminary √s = 13 TeV, 3.2 fb−1 X → ZZ → ``qq Tagged Resolved SR Data NWA H (750 GeV) Z + jets Top Quarks SM Diboson Stat.LSyst. Uncert. Pre-fit background 200 400 600 800 1000 1200 m(``jj) [GeV] 0.5 1.0 1.5 Data/Pred

[GeV]

H

m 300 400 500 600 700 800 900 1000 ZZ) [pb] → BR(H × H) → (gg σ 95% C.L. limit

1 −

10 1 10

NWA H Observed (CLs) NWA H Expected (CLs) [5%] Observed (CLs)

H H H H H

[5%] Expected (CLs) [10%] Observed (CLs) [10%] Expected (CLs) [15%] Observed (CLs) [15%] Expected (CLs)

H

ΓH/m ΓH/m ΓH/m ΓH/m ΓH/m ΓH/m

llqq → ZZ → H

ATLAS Preliminary

• 1

= 13 TeV, 3.2 fb s

SLIDE 28

28

Search for ZH, Hàinv

CMS-PAS-HIG-16-008

Motivated by supersymmetry, search is for a scalar boson, H, with m=110-600 GeV, decaying to invisible particles.

!

Analysis Selection 2 same flavor OS e or μ |mll-mZ| < 15 GeV and pT

ll > 60 GeV

≤ 1 jet, no b-jets or soft muons ET

miss > 100 GeV, Δφ(ll, ET miss) > 2.8 and

|ET

miss - pT ll|/pT ll < 0.4

Final discriminating variable is: which must be > 200 GeV.

SLIDE 29

29

Search for AàZh(125), hàbb

Searching for an additional pseudoscalar boson, as predicted in 2HDM. The search is for a narrow resonance of mH = 200-2000 GeV.

Analysis Strategy

!

• Targeting AàZhàννbb/llbb

!

• Makes use of categories:

1. 0/2-leptons 2. pT

Z < or > 500 GeV (defining the resolved/

boosted transition) 3. 1/2 b-tagged jets

!

• Final discriminant is invariant mllbb for 2-

lepton and for 0-lepton:

See talk in YSF4 by Carlo Pandini for more details. Dominant backgrounds of Z+jets and ttbar are validated and constrained in control regions. Signal Region

6

SLIDE 30

Limits on ggF and b-associated production from simultaneous binned-likelihood fit for signal and control regions.

30

Search for AàZh(125), hàbb

6

SLIDE 31

Analysis Strategy

!

A signal region (S) is defined for each mA-mH hypothesis in the plane of mbb-mllbb

!

tt and Drell-Yan processes are corrected through a fit to data of the mll distribution for events not in S.

!

The final limit is calculated from the single bin of S.

31

Search for HàZA, Zàll and Aàbb

CMS-PAS-HIG-16-010 Motivated by 2HDM with twisted custodial symmetry, which gives a heavier scalar H and a lighter pseudoscalar A boson.

!

SLIDE 32

32

Search for HàZA, Zàll and Aàbb

CMS-PAS-HIG-16-010

Limits are set on cross section times branching ratio for three mH hypotheses, as a function of mA.

[GeV]

A

m

40 60 80 100 120 140 160 180 200

BR [fb] × σ

1 10

2

10

3

10

4

10

5

10

= 300 GeV

H

m Observed

s

CL Expected

s

CL 1 std. deviation ± 2 std. deviation ± = 0.5) β (tan

th

σ = 1) β (tan

th

σ = 1.5) β (tan

th

σ

2HDM type-II ) = 0.01 α

• β

cos(

(13 TeV)

• 1

2.3 fb

CMS

Preliminary

[GeV]

A

m

100 200 300 400 500 600 700

BR [fb] × σ

1 10

2

10

3

10

4

10

5

10

= 800 GeV

H

m Observed

s

CL Expected

s

CL 1 std. deviation ± 2 std. deviation ± = 1) β (tan

th

σ = 1.5) β (tan

th

σ 2HDM type-II ) = 0.01 α

• β

cos(

(13 TeV)

• 1

2.3 fb

CMS

Preliminary

[GeV]

A

m

50 100 150 200 250 300 350 400

BR [fb] × σ

1 10

2

10

3

10

4

10

5

10

= 500 GeV

H

m Observed

s

CL Expected

s

CL 1 std. deviation ± 2 std. deviation ± = 1) β (tan

th

σ = 1.5) β (tan

th

σ 2HDM type-II ) = 0.01 α

• β

cos(

(13 TeV)

• 1

2.3 fb

CMS

Preliminary

SLIDE 33

[GeV]

γ J

m

700 720 740 760 780 800 820 840 860 880 900

]

• 1

[GeV

γ J

1/N dN/dm

0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018 0.02 q q → , Z γ Z → X → gg =800 GeV

X

m =13 TeV s

ATLAS Simulation Preliminary

33

Search for XàZγ

ATLAS-CONF-2016-010

Searching for an additional neutral boson (X), with a narrow width.

Analysis Strategy

!

• Zàll (250-1500 GeV):

–2 same flavor, opposite sign leptons consistent with Z.

!

• Zàqq (720-2750 GeV):

–Jets reconstructed as a single large-radius jet with pT > 200 GeV.

!

• Both channels use Zγ invariant

mass as a final discriminant.

[GeV]

γ ee

m

700 720 740 760 780 800 820 840 860 880 900

]

• 1

[GeV

γ ee

1/N dN/dm

0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 ee → , Z γ Z → X → gg =800 GeV

X

m =13 TeV s

ATLAS Simulation Preliminary

Leptonic Hadronic

SLIDE 34

34

Search for XàZγ

ATLAS-CONF-2016-010

Background Modeling

!

• Dominant background is continuum

production of Z+γ (leptonic) and γ +jets events (hadronic).

!

• In both, background is smoothly

falling spectrum as a function of minv, parameterized as:

! ! !

Largest deviation from background is 2σ at 350 GeV.

!

Observed limits range between 295 fb at mX = 340 GeV to 
 8.2 fb at mX = 2.15 TeV.

Events / 20 GeV

2 −

10

1 −

10 1 10

2

10

3

10

ATLAS Preliminary

• 1

=13 TeV, 3.2 fb s Data b Background-only fit,

[GeV]

γ J

m

1000 1500 2000 2500 3000 Data - b 20 − 10 − 10 20

[GeV]

X

m 500 1000 1500 2000 2500 3000 ) [fb] γ Z → BR(X × X) → (pp σ 95% CL limit on 10

2

10

Observed Expected σ 1 ± Exp. σ 2 ± Exp. µ µ ee, → Z q q → Z

ATLAS Preliminary γ Z → X → pp

• 1

=13 TeV, 3.2 fb s

Events / 20 GeV

2 −

10

1 −

10 1 10

2

10

3

10

Data b Background-only fit,

ATLAS Preliminary

• 1

=13 TeV, 3.2 fb s

[GeV]

γ ll

m

200 400 600 800 1000 1200 1400 1600 Data - b 20 − 10 − 10 20

SLIDE 35

In Summary

• There have already been a variety of searches for

extended scalars at 13 TeV, but this is just the beginning!

!

• Searches investigate a variety of models (2HDM,

2HDM+S, MSSM, etc.) and many final states.

!

• 2016 should be an interesting year for Beyond-

Standard-Model searches in high energy physics!

35

Public documents for analyses covered in this talk are either available now, or will become available in the following days.

SLIDE 36

Backup

36

SLIDE 37

Event Selection ET

miss trigger

≥3 jets including ≥1 b-tagged jet 1 τ and no e or μ ET

miss > 150 GeV

mT > 50 GeV

Search for H± àτν

• The Background contributions are split up by the
• rigin of the τ in the event:
• Jet → τ fakes (data-driven)
• Events with true τ (from MC, validated in CR)
• Events with lepton → τ fakes (Shape from MC,
• norm. from data)

[GeV]

T

m Events / 5 GeV 100 200 300 400 500 600

Diboson W+jets Z+jets & single-top t t

• µ

MisID e/

• MisID j

Data Diboson W+jets Z+jets & single-top t t

• µ

MisID e/

• MisID j

Data

ATLAS Preliminary

• 1

= 13 TeV, 3.2 fb s control region

• W

[GeV]

T

m 10 20 30 40 50 60 70 80 90 100 Data / SM 0.5 1 1.5 2

Uncertainty

[GeV]

T

m Events / 5 GeV 10 20 30 40 50 60 70 80 90

Diboson W+jets Z+jets & single-top t t

• µ

MisID e/

• MisID j

Data Diboson W+jets Z+jets & single-top t t

• µ

MisID e/

• MisID j

Data

ATLAS Preliminary

• 1

= 13 TeV, 3.2 fb s control region t t [GeV]

T

m 10 20 30 40 50 60 70 80 90 100 Data / SM 0.5 1 1.5 2

Uncertainty

37

SLIDE 38

A fake factor (FF) is measured in a multi- jet control region, defined as:

! ! !

where Nfail event τ candidates fail the full τ selection, and Npass pass.

Search for H± àτν

FF = N fail Npass FF parameterized in:

✓ τ pT , ✓ τ decay mode, ✓ Light/heavy flavor bins

based on b-tagging algorithm.

Final Contribution Defined by:

38

[GeV]

T

p 40

2

10

2

10 × 2

3

10

3

10 × 2 Fake Factors

• 2

10

• 1

10 1 10

• 1

=13TeV, 3.2 fb s Light-flavour region

• 1

=13TeV, 3.2 fb s Light-flavour region

• 1

=13TeV, 3.2 fb s Light-flavour region

• 1

=13TeV, 3.2 fb s Light-flavour region

ATLAS Preliminary

1p0n 1p1n 1pXn 3p0n 3pXn

[GeV]

T

p 40

2

10

2

10 × 2

3

10

3

10 × 2 Fake Factors

• 2

10

• 1

10 1 10

• 1

=13TeV, 3.2 fb s Heavy-flavour region

• 1

=13TeV, 3.2 fb s Heavy-flavour region

• 1

=13TeV, 3.2 fb s Heavy-flavour region

• 1

=13TeV, 3.2 fb s Heavy-flavour region

ATLAS Preliminary

1p0n 1p1n 1pXn 3p0n 3pXn

SLIDE 39

Final discriminant in both channels

Search for H/A àττ

τlepτhad Event Selection

!

Single lepton triggers 1 medium τ, pT > 20 GeV 1 medium, isolated e/μ, pT > 30 GeV τ and e/μ of opposite sign charge Δφ(τ, e/μ ) > 2.4 MT(e/μ, MET) < 40 GeV or > 150 GeV

!

In e-channel: mvis < 80 and > 110 GeV

τhadτhad Event Selection

!

Single τhad trigger 2 τhad with OS charge No loose e/μ Δφ(τhad,1, τhad,2 ) > 2.7 Leading τhad is medium, trigger-matched, pT > 135 GeV Subleading τhad is loose, pT > 55 GeV

Hàττ provides sensitivity in MSSM at high tanβ, and in 2HDM at the alignment limit. Analysis targets two channels with different τ decay modes.

39

ATLAS-CONF-2015-061

SLIDE 40

Search for H/A àττ: τlepτhad Backgrounds

True τ backgrounds (Z->ττ, tt) are taken from simulation. Jetàτ backgrounds are estimated using “Combined Fake Factor” Method Combined FF = FFW+jetsrW+jets + FFQCDrQCD

The Combined FF is applied to events where τ fails ID requirement.

40

SLIDE 41

Background estimation is validated in same-sign control region.

Search for H/A àττ: τhadτhad Backgrounds

✓ True τ backgrounds (Z->ττ, tt) are taken from simulation.

!

✓ Jetàτ backgrounds are estimated by applying fake rate from data in place of simulated τ ID response.

!

✓ Multi-jet backgrounds are estimated using a fake factor measured in a dijet CR.

41

SLIDE 42

42

ATLAS: HàZZà4l

Expected and Observed events for the ATLAS high mass H->ZZ->4l analysis.

SLIDE 43

• Background:

– Continuum from data – SM h & hh from MC – Cut-and-count in 95% mbbγγ window with data- driven continuum background:

43

ATLAS-CONF-2016-004

0 events in mass window

Search for Hàhhàbbγγ

SLIDE 44

44

ATLAS-CONF-2016-004

Search for Hàhhàbbγγ

Mass constraint does not dramatically change the background shape. Limit in terms of # of events.

SLIDE 45

45

Search for XàZγ

# Not Yet Available

Limits split into leptonic and hadronic.

[GeV]

X

m 200 400 600 800 1000 1200 1400 1600 ) [fb] γ Z → BR(X × X) → (pp σ 95% CL limit on 50 100 150 200 250 300 350 400 450 500 Observed Expected σ 1 ± σ 2 ± ATLAS Preliminary µ µ ee, → , Z γ Z → X → pp

• 1

=13 TeV, 3.2 fb s [GeV]

X

m 500 1000 1500 2000 2500 3000 ) [fb] γ Z → BR(X × X) → (pp σ 95% CL limit on 50 100 150 200 250 300 350 400 450 500 Observed Expected σ 1 ± σ 2 ± ATLAS Preliminary q q → , Z γ Z → X → pp

• 1

=13 TeV, 3.2 fb s

SLIDE 46

46

Search for XàZγ

# Not Yet Available

Comparison of ee and mumu signal resolution

[GeV]

γ µ µ

m

700 720 740 760 780 800 820 840 860 880 900

]

• 1

[GeV

γ µ µ

1/N dN/dm

0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 µ µ → , Z γ Z → X → gg =800 GeV

X

m =13 TeV s

ATLAS Simulation Preliminary [GeV]

γ ee

m

700 720 740 760 780 800 820 840 860 880 900

]

• 1

[GeV

γ ee

1/N dN/dm

0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 ee → , Z γ Z → X → gg =800 GeV

X

m =13 TeV s

ATLAS Simulation Preliminary

SLIDE 47

47

Search for Hàllνν

CMS-PAS-HIG-16-001

SLIDE 48

• Several diboson resonance

searches in ATLAS have also been interpreted in terms of a heavy Higgs-like boson.

– For details of the analyses, see Max Bellomo’s talk Thursday.

!

• Limits are set in the narrow width

approximation, as well as for widths ranging from 5-15%.

48

Boosted Diboson Resonances

HàWWàlνqq HàZZàννqq HàZZàllqq ATLAS-CONF-2015-075 ATLAS-CONF-2015-071 ATLAS-CONF-2015-068

SLIDE 49

• Several diboson resonance

searches in ATLAS have also been interpreted in terms of a heavy Higgs-like boson.

– For details of the analysis, see Max Bellomo’s talk Thursday.

!

• Limits are set in the narrow width

approximation, as well as for widths ranging from 5-15%.

49

Boosted Diboson Resonances

HàWWàlνqq HàZZàννqq HàZZàllqq ATLAS-CONF-2015-075 ATLAS-CONF-2015-071 ATLAS-CONF-2015-068