News from the Higgs boson On behalf of the ATLAS and CMS - - PowerPoint PPT Presentation

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News from the Higgs boson On behalf of the ATLAS and CMS - - PowerPoint PPT Presentation

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News from the Higgs boson On behalf of the ATLAS and CMS collaborations Cyril Becot ALPS 2019, 27.04.2019 Run 1 legacy : from discovery to measurements > Higgs boson discovery is the major LHC Run 1 legacy > Already allowed some precise

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SLIDE 1

News from the Higgs boson

On behalf of the ATLAS and CMS collaborations Cyril Becot ALPS 2019, 27.04.2019

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SLIDE 2

Run 1 legacy : from discovery to measurements

> Higgs boson discovery is the major LHC Run 1 legacy > Already allowed some precise measurements : mH, σinc > But clearly missing pieces : associated productions...

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 2

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SLIDE 3

Current Run 2 status...

Throughout Run 2, combinations of channels have allowed to observe ALL 5 expected production modes (ggF,VBF,VH,ttH) and decay modes (γγ, ZZ, WW, ττ,b¯ b) Current emphasis on single-channel observations and precise measurements

ggF VBF VH t¯ tH b¯ b Searched for Observed Searched for τ +τ − Observed Searched for W +W − Observed Searched for Z0Z0 Observed γγ Observed Strong evidence

Recent results for the channels in blue will be presented today

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 3

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SLIDE 4

Current Run 2 status...

Throughout Run 2, combinations of channels have allowed to observe ALL 5 expected production modes (ggF,VBF,VH,ttH) and decay modes (γγ, ZZ, WW, ττ,b¯ b) Current emphasis on single-channel observations and precise measurements

ggF VBF VH t¯ tH b¯ b Searched for Observed Searched for τ +τ − Observed Searched for W +W − Observed Searched for Z0Z0 Observed γγ Observed Strong evidence

Recent results for the channels in blue will be presented today

Completion of this measurement program, together with searches related to an extended Higgs sector, will put strong constrains on the Higgs potential

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 4

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SLIDE 5

Outline of this talk

Pinning down the 125 GeV Higgs boson The Simplified Template Cross-sections framework (STXS) Cross-section measurements Toward single-channel observations (Too) rare decays Searches for an extended Higgs sector Using the SM Higgs as a tool Searching for new heavy Higgs bosons

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 5

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SLIDE 6

Evidence of V h, h → b¯

b

> Both experiments reported a strong evidence for V H, H → b¯ b last summer (ATLAS,CMS) > The 3 channels are used (WH → lνb¯ b, ZH → (ll/νν)b¯ b > Both experiments use MVAs to improve S/B (dominated by mb¯

b, pV T , ∆R(b1, b2))

> Reported significances (Run1+2) :

ATLAS 4.9σ(obs), 5.1σ(exp) CMS 4.8σ(obs), 4.9σ(exp)

> High single-channel significance makes it a great place for measurements !

→ However the best observables to

measure need to be defined

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 6

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SLIDE 7

The Simplified Template Cross-section framework (STXS)

An optimal framework for Higgs measurements needs to : > Allow to easily combine various decay channels and across exp. > Allow for easy re-interpretation > Minimize theory dependence

→ Simplified template cross-section (STXS) : SM used to build templates for the

different production modes in various kinematic regions, matching as close as possible the analysis categories

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 7

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SLIDE 8

The Simplified Template Cross-section framework (STXS)

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 8

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SLIDE 9

STXS measurement in V h, h → b¯

b in ATLAS arXiv:1903.04618

The V h, h → b¯ b analysis is then used to extract the VH STXS, where this channel brings strong constraints esp. on high-P V

T bins. Allow to split in P V T and WH vs ZH

1 − 0.8 − 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6 0.8 1

  • utput

VH

BDT

0.05 0.1 0.15 0.2 0.25 0.3 0.35

Normalised to unity

Total signal < 250 GeV

V T

150 < p > 250 GeV

V T

p All background

Simulation ATLAS

= 13 TeV s 1 lepton, 2 jets, 2 b-tags 150 GeV ≥

,r V T

p

Different bin of pV, truth

T

contribute to a given pV, reco

T

, but with a different BDT shape

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 9

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SLIDE 10

STXS measurement in h → γγ in CMS CMS-PAS-HIG-18-029

Narrow peak on a smooth background

S/(S+B) Weighted Events / GeV

5000 10000 15000 20000 25000 30000 35000

Data S+B fit B component σ 1 ± σ 2 ± S/(S+B) weighted All categories

  • Preliminary

CMS TeV) (13

  • 1

77.4 fb γ γ → H (GeV)

γ γ

m

100 110 120 130 140 150 160 170 180 500 − 500 1000

B component subtracted

Signal extracted in different categories via S+B

  • fit. Each category is populated by different

fractions of STXS bins

theo

σ /

proc

σ

2 − 2 4 6 8

  • 0.0
+1.7

0.0

qqH other

  • 0.0
+0.7

0.0

qqH 3J-like

  • 0.5
+0.6

1.3

qqH 2J-like

  • 0.0
+0.5

0.0

ggH VBF-like

  • 1.2
+1.1

2.8

ggH 2J BSM

  • 0.6
+0.8

0.6

ggH 2J high

  • 1.1
+1.0

2.7

ggH 2J med

  • 0.3
+1.4

0.3

ggH 2J low

  • 1.5
+1.6

1.8

ggH 1J BSM

  • 0.7
+1.0

2.0

ggH 1J high

  • 0.4
+0.5

0.5

ggH 1J med

  • 0.6
+0.7

1.5

ggH 1J low

  • 0.20
+0.20

1.17

ggH 0J

profiled

H

m Observation SM Prediction

Preliminary

CMS γ γ → H TeV) (13

  • 1

77.4 fb Category signal composition (%) 20 40 60 80 100

73 11 5 1 1 1 3 4 78 10 4 1 1 1 2 3 83 8 2 1 2 3 27 55 1 6 1 1 5 5 27 54 2 5 1 1 1 5 5 1 1 63 1 14 1 1 3 1 8 6 2 2 65 12 1 1 2 1 8 6 51 1 15 1 2 6 2 10 1 9 2 49 17 2 2 5 2 10 9 1 48 18 2 1 2 14 12 16 19 41 1 1 2 1 1 5 13 15 19 39 1 1 2 1 1 6 1 14 14 59 2 2 1 1 5 1 15 1 16 1 54 1 2 1 1 6 1 16 7 59 2 2 1 1 5 1 1 20 7 1 56 1 1 3 1 1 5 1 1 22 4 1 62 1 2 5 1 24 3 2 56 1 1 2 5 1 30 1 3 1 1 1 1 1 13 3 58 7 9 1 1 2 3 4 1 2 4 2 1 18 5 40 4 13 2 1 2 1 1 1 3 7 5 15 26 26 7 2 3 1 3 5 2 3 7 4 3 6 21 13 16 8 1 6 1 2 3 2 8 16 18 8 1 2 2 1 26 7 2 2 37 2 2 5 3 1 39 7

STXS process

ggH 0J ggH 1J low ggH 1J med ggH 1J high ggH 1J BSM ggH 2J low ggH 2J med ggH 2J high ggH 2J BSM ggH VBF-like 2J ggH VBF-like 3J VBF 2J-like VBF 3J-like VBF rest VBF BSM VBF VH-like Other

Event category

0J Tag0 0J Tag1 0J Tag2 1J low Tag0 1J low Tag1 1J med Tag0 1J med Tag1 1J high Tag0 1J high Tag1 1J BSM 2J low Tag0 2J low Tag1 2J med Tag0 2J med Tag1 2J high Tag0 2J high Tag1 2J BSM Tag0 2J BSM Tag1 VBF 2J-like Tag0 VBF 2J-like Tag1 VBF 3J-like Tag0 VBF 3J-like Tag1 VBF rest VBF BSM

γ γ → H Simulation Preliminary CMS 13 TeV (2017) DESYª | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 10

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SLIDE 11

STXS measurement in h → 4l in CMS - Full Run2 CMS-PAS-HIG-19-001

Early full Run 2 Result ! The statistics allows to further split ggF/VBF in Njets, P H

T

(GeV)

l 4

m

50 100 150 200 250 300 350

Events / 4GeV

Data H(125) * γ ZZ, Z → q q * γ ZZ, Z → gg Z+X

(13 TeV)

  • 1

137.1 fb Preliminary 2016 + 2017 + 2018

CMS 80 100 200 300 400 500

Clean and narrow peak on top of well-controlled background

Corresponding ATLAS result (36.1 fb−1) : JHEP03(2018)095

SM

σ / σ

0 1 2 3 4 5 6 7 8 9 10

  • 0.07

+0.90

0.07 H,tH t t

  • 0.57

+1.20

0.57 qqH-2j/mJJ[60-120]

  • 0.00

+1.57

0.00 VH/pTV>150

  • 1.85

+2.49

3.21 VH/pTV[0-150]

  • 0.00

+0.73

0.00 qqH-2j/pT>200

  • 0.00

+2.43

0.00 qqH-rest

  • 2.89

+2.88

2.89 qqH-3j/mJJ>350

  • 0.90

+1.17

0.93 qqH-2j/mJJ>700

  • 1.71

+1.91

1.71 qqH-2j/mJJ[350,700]

  • 0.47

+0.51

0.47 ggH/pT>200

  • 0.00

+3.28

0.00 ggH-2j/mJJ>350

  • 0.75

+0.87

1.16 ggH-2j/pT[120-200]

  • 0.80

+0.83

1.59 ggH-2j/pT[60-120]

  • 1.13

+1.35

1.47 ggH-2j/pT[0-60]

  • 0.96

+1.09

1.52 ggH-1j/pT[120-200]

  • 0.51

+0.41

0.82 ggH-1j/pT[60-120]

  • 0.51

+0.48

0.78 ggH-1j/pT[0-60]

  • 0.17

+0.18

1.06 ggH-0j/pT[10-200]

  • 0.25

+0.28

0.87 ggH-0j/pT[0,10]

0.06 (fb)

SM

σ 4l → ZZ → H 0.05 0.03 0.11 0.02 0.25 0.04 0.07 0.05 0.07 0.10 0.11 0.23 0.16 0.10 0.57 0.88 2.53 0.80

profiled

H

m

(13 TeV)

  • 1

137.1 fb

CMS Preliminary DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 11

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SLIDE 12

σFid measurement in h → 4l in CMS - Full Run2

As it doesn’t involve any MVA, can be unfolded to truth-level directly → measure fiducial and differential cross-section

(TeV) s

6 7 8 9 10 11 12 13 14

(fb)

fid

σ

1 2 3 4 5 6

  • sys. unc.)

⊕ Data (stat. Systematic uncertainty Standard model =125.09 GeV

H

LHC HXSWG YR4, m (13 TeV)

  • 1

(8 TeV), 137.1 fb

  • 1

(7 TeV), 19.7 fb

  • 1

5.1 fb

CMS

4l) + X → (H → pp

(H) (fb/GeV)

T

/dp

fid

σ d

4 −

10

3 −

10

2 −

10

1 −

10 1

  • sys. unc.)

⊕ Data (stat. Systematic uncertainty H (NNLOPS) + XH → gg H (POWHEG) + XH → gg XH = VBF + VH + ttH (POWHEG) =125.09 GeV)

H

(LHC HXSWG YR4, m

(13 TeV)

  • 1

137.1 fb

CMS Preliminary

(H) > 200 GeV)

T

(p σ 50 1

(H) (GeV)

T

p

50 100 150 200 250

Ratio to NNLOPS 0.2 0.4 0.6 0.8 1 1.2 1.4

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 12

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SLIDE 13

STXS measurement in h → τ+τ− in CMS CMS-PAS-HIG-18-032

Multi-class NN discriminates between ggF, VBF and main backgrounds. Signal is extracted by fitting NN outputs.

Most powerful variables : mSV

ττ ,mvis,pvis T ,p τ1,2 T

,p

j1,2 T

5 − 5 10 15 20 Best fit μproc = σproc/σSM

2 4 6 8 10 12 14

μproc = 0 Jet

  • 0.75
+0.76
  • 0.40

= 1 Jet pH

T [

0, 60]

  • 1.39
+1.37
  • 0.34

pH

T [ 60, 120]
  • 1.50
+1.56

1.26 pH

T [120, ∞ ]
  • 1.01
+1.18

1.80 ≥ 2 Jet

  • 0.86
+0.91

0.47 Inclusive

  • 0.37
+0.36

0.36 VBF topology

  • 0.29
+0.30

1.00 V(qq)H topology

  • 1.47
+1.54
  • 1.17

pj1

T > 200 GeV
  • 1.05
+1.03

1.41 Rest

  • 2.67
+2.75
  • 1.06

Inclusive

  • 0.29
+0.30

1.03

VBF+V(qq)H

NNLO QCD, NLO EW
  • acc. Powheg NLO × K-fact.

gg→H, bbH

N3LO QCD, NLO EW
  • acc. Powheg NLO × K-fact.

(13 TeV)

  • 1

77.4 fb

CMS Preliminary

Observation SM expectation scale ⊕ PDF ⊕ αS ⊕ BR uncertainties

CMS also published a dedicated search for V H(ττ) arXiv:1809.03590 (2.3σ obs. significance) ATLAS ggF+VBF result : PhysRevD.99.072001

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| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 13

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SLIDE 14

Higgs STXS combination in ATLAS ATLAS-CONF-2019-005

> Big interest in combining STXS among different decay channel

Framework uses production mode kinematic variables, not decay products Different channels bring sensitivity to different phase spaces

> ATLAS combined results from the γγ, ZZ, W +W −, τ +τ −, b¯ b channels > Results consistent with SM expectations > Combination can also be done to measure couplings modifiers

Total SM

Preliminary ATLAS

  • 1

= 13 TeV, 36.1 - 79.8 fb s | < 2.5

H

y = 125.09 GeV, |

H

m = 89%

SM

p

, 0-jet H → gg < 60 GeV

H T

p , 1-jet, H → gg < 120 GeV

H T

p ≤ , 1-jet, 60 H → gg < 200 GeV

H T

p ≤ , 1-jet, 120 H → gg 200 GeV ≥

H T

p 1-jet, ≥ , H → gg < 200 GeV

H T

p 2-jet, ≥ , H → gg , VBF topo + Rest Hqq → qq topo VH , Hqq → qq 200 GeV ≥

j T

p , Hqq → qq < 250 GeV

T V

p , ν Hl → qq 250 GeV ≥

T V

p , ν Hl → qq < 150 GeV

T V

p , Hll → gg/qq < 250 GeV

T V

p ≤ , 150 Hll → gg/qq 250 GeV ≥

T V

p , Hll → gg/qq ttH + tH

[pb]

SM ZZ

/B

ZZ

B ×

i

σ

2 −

10

1 −

10 1 10 0.5 19.5

1 −

10 1 10

ZZ

/B

γ γ

B

ZZ

/B

b b

B

ZZ

/B

WW

B

ZZ

/B

  • τ
+ τ

B

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 14

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SLIDE 15

Higgs STXS combination in ATLAS

Add offshell H → 4l, H → inv searches here Evolution vs mass as in SM No deviations seen in couplings

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 15

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SLIDE 16

Outline

Pinning down the 125 GeV Higgs boson The Simplified Template Cross-sections framework (STXS) Cross-section measurements Toward single-channel observations (Too) rare decays Searches for an extended Higgs sector Using the SM Higgs as a tool Searching for new heavy Higgs bosons

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 16

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SLIDE 17

Analysis V h, h → W +W − in ATLAS arXiv:1903.10052

Require 3 or 4 isolated leptons, with total charge matching WH/ZH events BDTs are used to select WH events, cut-based approach for ZH

Events / 0.1 5 10 15 20 25 30

Data Uncertainty top-quark VVV * γ WZ / W * ZZ 10 × WH

ATLAS

  • 1

= 13 TeV, 36.1 fb s ν l ν l ν l → WH Z-depleted

t t

BDT 1 − 0.8 − 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6 0.8 1 Data/Bkg 0.5 1 1.5 2 2.5 3

Evidence for VH, H→ WW : 4.1σ observed, 1.9σ exp.

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 17

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SLIDE 18

Search for t¯

th, h → γγ in ATLAS - Full Run2 ATLAS-CONF-2019-004

> Full Run 2 Result > Uses 0lep and > 0lep categories > Cut on BDT trained with low-level var. :

4-vec of the photons 4-vec of the leptons 4-vec of the jets

> Defines 7 categories, where mγγ is fitted using a functional form > Signal extracted using combined likelihood fit over 7 categories

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 18

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SLIDE 19

Search for t¯

th, h → γγ in ATLAS - Full Run2

Final significance : 4.9σ (obs), 4.2σ (exp)

110 120 130 140 150 160 [GeV]

γ γ

m 5 10 15 20 25 30 Sum of Weights / 1.375 GeV

Data Continuum Background Total Background Signal + Background

Preliminary ATLAS

  • 1

= 13 TeV, 139 fb s

= 125.09 GeV

H

m All categories ln(1+S/B) weighted sum

20 40 60 80 100 120 140 160 180 Events

Data =1.4) µ H ( t t H Higgs t Non-t

  • Cont. Bkg.

Had categories Lep categories Preliminary ATLAS

  • 1

=13 TeV, 139 fb s

Had 4 Had 3 Had 2 Had 1 Lep 3 Lep 2 Lep 1

20

Data - Bkg.

=1.4) µ H ( t t

σt¯

tHBRγγ = 1.59+0.38 −0.36(stat.)+0.15 −0.12(exp.)+0.15 −0.11(theo). fb

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 19

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SLIDE 20

Outline

Pinning down the 125 GeV Higgs boson The Simplified Template Cross-sections framework (STXS) Cross-section measurements Toward single-channel observations (Too) rare decays Searches for an extended Higgs sector Using the SM Higgs as a tool Searching for new heavy Higgs bosons

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 20

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SLIDE 21

Search for invisible Higgs in t¯

th CMS-PAS-HIG-18-008

All full-had (merged+resolved), di-leptonic and semi-leptonic top decay channels considered

> t¯ tH would be enhanced for large yt and allows strong bkg suppression > First search for invisible Higgs decays using t¯ tH topology !

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 21

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SLIDE 22

Combination of searches for invisible Higgs in ATLAS

arXiv:1904.05105

> ATLAS performed other H → inv. searches earlier

VBF, VH signatures (no ggF) Also combined with Run 1 results

> BR(H → inv.) < 0.26 obs (0.17 exp.)

Full Run1+Run2 combination for these signatures, 95% C.L. exclusion Remember : BRSM(H → inv.) = 0.1%

DESYª

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SLIDE 23

Combination of searches for invisible Higgs in CMS

arXiv:1809.05937

> CMS performed a similar combination

VBF, VH and ggF signatures These signatures were combined ! Also combined with Run 1 results

> BR(H → inv.) < 0.19 obs (0.15 exp.)

Strongest limit on BR(H → inv.) so far Full Run1+Run2 combination for these signatures, 95% C.L. exclusion

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 23

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SLIDE 24

Searches for rare decay of the Higgs boson CMS-PAS-HIG-18-025

H → J/ΨJ/Ψ, H → ΥΥ suppressed in the SM but could be enhanced (large yc...). Clean signature (M4µ peak)

  • bserved

expected B(H → J/ψJ/ψ) × 103 1.8 1.8+0.2

−0.1

B(H → ΥΥ) × 103 1.4 1.4 ± 0.1 B(Z → J/ψJ/ψ) × 106 2.2 2.8+1.2

−0.7

B(Z → ΥΥ) × 106 1.5 1.5 ± 0.1

Very small background → limit scales as luminosity

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 24

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SLIDE 25

Outline

Pinning down the 125 GeV Higgs boson The Simplified Template Cross-sections framework (STXS) Cross-section measurements Toward single-channel observations (Too) rare decays Searches for an extended Higgs sector Using the SM Higgs as a tool Searching for new heavy Higgs bosons

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 25

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SLIDE 26

Decays of the Higgs to light pseudo-scalars CMS-PAS-HIG-18-006

Targets models with light pseudoscalar (2HD+1S) in H → a1a1 → 2τ2µ/4τ

Reconstruct 1µ with nearby OS charged track for each a1 > Performs especially well for overlapping a1 decay products (lower mass) > However at very low mass background becomes important (mainly b-jets)

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 26

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SLIDE 27

Searching new Higgs decaying in SM Higgs ATLAS-HIGG-2016-24

> Search for additional heavy scalar (MSSM)

X → 2 HSM → 4W or 2 S → 4W X → t¯ t dominates mX > 2 mT op

> Tag the HSM to search for the new sector

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 27

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SLIDE 28

New Higgs searches tagging SM Higgs CMS-PAS-HIG-18-023

Search for an additional pseudo-scalar (MSSM) in A → (Z0 → ee/µµ)(HSM → ττ) > In particular low tanβ(= v1

v2 )

> Constrain mττ = mHSM to improve the sensitivity (SVFIT)

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 28

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SLIDE 29

Outline

Pinning down the 125 GeV Higgs boson The Simplified Template Cross-sections framework (STXS) Cross-section measurements Toward single-channel observations (Too) rare decays Searches for an extended Higgs sector Using the SM Higgs as a tool Searching for new heavy Higgs bosons

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 29

slide-30
SLIDE 30

Searches for charged Higgs decaying in τν arXiv:1903.04560

2HDMs predict charged scalar, with sizeable BR(H± → τ ±ν) at high tanβ (in type-2) > Produced in association with top and b-quarks > Split into 3 final states

τHad+jets, τHad+leptons, no-τHad+leptons

> Further categorize these FS

  • Esp. wrt number of jets, b-jets

> Extract the signal from a combined fit of mT over all 36 categories

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 30

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SLIDE 31

Searches for charged Higgs decaying in τν arXiv:1903.04560

2HDMs predict charged scalar, with sizeable BR(H± → τ ±ν) at high tanβ (in type-2)

Up to mH± = 165 GeV, production is t → H±b. No assumption made after

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 31

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SLIDE 32

bH production of a new Heavy neutral boson ATLAS-CONF-2019-010

A q ¯ q b ¯ b φ [GeV]

φ

m 600 800 1000 1200 1400 ) [pb] b b → φ B( ) φ b b → (pp σ

1 −

10 1 10

Observed (CLs) Expected (CLs) σ 1

  • σ

2

  • ATLAS Preliminary
  • 1

= 13 TeV, 27.8 fb s 95% CL Limits

> Targets flipped 2HDM at high-tanβ where new scalar could mainly couple to b − quarks > Challenging b-jet trigger (ǫ2016 = 80 − 90%) > Sensitivity enhanced by transforming mbb,p1,2

T

to isolate signal from FSR g∗ → b¯ b

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 32

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SLIDE 33

Conclusion

> Large effort is being carried out to pinpoint the nature of the Higgs boson in detail

→ So far no deviation from SM observed, but a large increase in stat. expected : most

analyses only use 1 4 of the dataset - stay tuned ! > Potential additional content of the Higgs sector being studied as well → Only scratched a few of searches available already (eg H → t¯ t) → And many more will be performed ! > Complex and precise legacy analyses take time → Stay tune for new strong results throughout LS 2 !

DESYª

| News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 33