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

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 measurements : m H , σ inc > But clearly missing pieces : associated productions... | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 2 DESYª

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 ¯ Searched for Observed Searched for b τ + τ − Observed W + W − Observed Searched for Searched for Z 0 Z 0 Observed Observed Strong evidence γγ Recent results for the channels in blue will be presented today | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 3 DESYª

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 ¯ Searched for Observed Searched for b Observed τ + τ − W + W − Observed Searched for Searched for Observed Z 0 Z 0 Observed Strong evidence γγ 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 | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 4 DESYª

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

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 m b ¯ b , p V T , ∆ R ( b 1 , b 2 ) ) > Reported significances (Run1+2) : ATLAS 4.9 σ (obs), 5.1 σ (exp) CMS 4.8 σ (obs), 4.9 σ (exp) > High single-channel significance makes it a great place for measurements ! → However the best observables to measure need to be defined | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 6 DESYª

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

The Simplified Template Cross-section framework (STXS) | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 8 DESYª

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 0.35 Normalised to unity ATLAS Simulation 0.3 Total signal s = 13 TeV V 150 < p < 250 GeV 1 lepton, 2 jets, 2 b-tags T p V > 250 GeV 0.25 V ,r ≥ p 150 GeV T T All background 0.2 0.15 0.1 0.05 0 − − − − − 1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 BDT output VH Different bin of p V, truth contribute to a given p V, reco , but with a different BDT shape T T | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 9 DESYª

STXS measurement in h → γγ in CMS CMS-PAS-HIG-18-029 Narrow peak on a smooth background -1 CMS 77.4 fb (13 TeV) Preliminary → γ γ H Observation ggH 0J 1.17 +0.20 -1 -0.20 CMS 77.4 fb (13 TeV) Preliminary ggH 1J low 1.5 +0.7 -0.6 S/(S+B) Weighted Events / GeV SM Prediction 35000 → γ γ H ggH 1J med 0.5 +0.5 -0.4 All categories ggH 1J high 2.0 +1.0 S/(S+B) weighted -0.7 30000 m profiled ggH 1J BSM H - 1.8 +1.6 -1.5 Data - ggH 2J low +1.4 25000 0.3 -0.3 S+B fit ggH 2J med +1.0 2.7 B component -1.1 ggH 2J high 20000 +0.8 ± σ 0.6 -0.6 1 ggH 2J BSM +1.1 ± σ 2.8 -1.2 2 15000 ggH VBF-like +0.5 0.0 -0.0 qqH 2J-like +0.6 1.3 -0.5 10000 qqH 3J-like +0.7 0.0 -0.0 qqH other 0.0 +1.7 5000 -0.0 − 2 0 2 4 6 8 σ σ / 0 proc theo 1000 B component subtracted → γ γ CMS Simulation Preliminary H 13 TeV (2017) 500 100 Category signal composition (%) Event category VBF BSM 2 2 37 2 2 5 3 1 39 7 VBF rest 1 2 3 2 8 16 18 8 1 2 2 1 26 7 VBF 3J-like Tag1 1 3 5 2 3 7 4 3 6 21 13 16 8 1 6 0 VBF 3J-like Tag0 1 2 1 1 1 3 7 5 15 26 26 7 2 3 VBF 2J-like Tag1 80 2 3 4 1 2 4 2 1 18 5 40 4 13 2 VBF 2J-like Tag0 1 3 1 1 1 1 1 13 3 58 7 9 1 1 − 2J BSM Tag1 3 2 56 1 1 2 5 1 30 500 2J BSM Tag0 4 1 62 1 2 5 1 24 2J high Tag1 100 110 120 130 140 150 160 170 180 7 1 56 1 1 3 1 1 5 1 1 22 2J high Tag0 60 7 59 2 2 1 1 5 1 1 20 m (GeV) 2J med Tag1 1 16 1 54 1 2 1 1 6 1 16 γ γ 2J med Tag0 14 59 2 2 1 1 5 1 15 2J low Tag1 15 19 39 1 1 2 1 1 6 1 14 2J low Tag0 16 19 41 1 1 2 1 1 5 13 40 1J BSM 1 48 18 2 1 2 14 12 Signal extracted in different categories via S+B 1J high Tag1 2 49 17 2 2 5 2 10 9 1J high Tag0 51 1 15 1 2 6 2 10 1 9 1J med Tag1 2 2 65 12 1 1 2 1 8 6 1J med Tag0 1 1 63 1 14 1 1 3 1 8 6 fit. Each category is populated by different 20 1J low Tag1 27 54 2 5 1 1 1 5 5 1J low Tag0 27 55 1 6 1 1 5 5 0J Tag2 83 8 2 1 2 3 0J Tag1 78 10 4 1 1 1 2 3 fractions of STXS bins 0J Tag0 73 11 5 1 1 1 3 4 0 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 | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 10 DESYª STXS process

STXS measurement in h → 4 l in CMS - Full Run2 CMS-PAS-HIG-19-001 Early full Run 2 Result ! The statistics allows to further split ggF/VBF in N jets , P H T -1 CMS Preliminary CMS Preliminary 2016 + 2017 + 2018 137.1 fb -1 (13 TeV) 137.1 fb (13 TeV) Events / 4GeV 350 → → H ZZ 4l Data m profiled σ H(125) (fb) H → γ SM q q ZZ, Z * 300 → γ gg ZZ, Z * +0.28 ggH-0j/pT[0,10] 0.87 0.80 Z+X -0.25 +0.18 ggH-0j/pT[10-200] 1.06 2.53 250 -0.17 +0.48 ggH-1j/pT[0-60] 0.78 0.88 -0.51 +0.41 ggH-1j/pT[60-120] 0.82 0.57 200 -0.51 +1.09 ggH-1j/pT[120-200] 1.52 0.10 -0.96 +1.35 150 ggH-2j/pT[0-60] 1.47 0.16 -1.13 +0.83 ggH-2j/pT[60-120] 1.59 0.23 -0.80 +0.87 ggH-2j/pT[120-200] 1.16 0.11 100 -0.75 +3.28 ggH-2j/mJJ>350 0.00 0.10 -0.00 +0.51 ggH/pT>200 0.47 0.07 50 -0.47 +1.91 qqH-2j/mJJ[350,700] 1.71 0.05 -1.71 +1.17 qqH-2j/mJJ>700 0.93 0.07 0 80 100 200 300 400 500 -0.90 +2.88 qqH-3j/mJJ>350 2.89 0.04 m (GeV) -2.89 +2.43 4 l qqH-rest 0.00 0.25 -0.00 Clean and narrow peak on top of +0.73 qqH-2j/pT>200 0.00 0.02 -0.00 +2.49 VH/pTV[0-150] 3.21 0.11 -1.85 well-controlled background +1.57 VH/pTV>150 0.00 0.03 -0.00 +1.20 qqH-2j/mJJ[60-120] 0.57 0.05 -0.57 +0.90 t t H,tH 0.07 0.06 -0.07 Corresponding ATLAS result ( 36 . 1 fb − 1 ) : 0 1 2 3 4 5 6 7 8 9 10 σ σ / JHEP03(2018)095 SM | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 11 DESYª

σ Fid measurement in h → 4 l in CMS - Full Run2 As it doesn’t involve any MVA, can be unfolded to truth-level directly → measure fiducial and differential cross-section CMS Preliminary -1 -1 -1 -1 5.1 fb (7 TeV), 19.7 fb (8 TeV), 137.1 fb (13 TeV) 137.1 fb (13 TeV) (fb) (H) (fb/GeV) 6 ⊕ CMS Data (stat. sys. unc.) 1 Systematic uncertainty fid ⊕ Data (stat. sys. unc.) → gg H (NNLOPS) + XH σ 5 → (H) > 200 GeV) − gg H (POWHEG) + XH Systematic uncertainty 1 10 XH = VBF + VH + ttH (POWHEG) Standard model (LHC HXSWG YR4, m =125.09 GeV) 4 H LHC HXSWG YR4, m =125.09 GeV − T 2 H 10 T /dp (p σ 50 1 3 fid − 3 10 σ d 2 − 4 10 Ratio to NNLOPS 1.4 1 1.2 1 → → pp (H 4l) + X 0.8 0.6 0 0.4 0.2 6 7 8 9 10 11 12 13 14 0 0 50 100 150 200 250 s (TeV) p (H) (GeV) T | News from the Higgs boson | Cyril Becot | ALPS 2019, 27.04.2019 Page 12 DESYª