Teilchenphysik 2 — W/Z/Higgs an Collidern

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Teilchenphysik 2 — W/Z/Higgs an Collidern

Sommersemester 2019

Matthias Schr ¨oder und Roger Wolf | Exercises No 6

I

NSTITUT FUR

¨ E

XPERIMENTELLE

T

EILCHENPHYSIK

(ETP)

KIT – Die Forschungsuniversit ¨at in der Helmholtz-Gemeinschaft

www.kit.edu

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Observation of H → bb

[Phys. Rev. Lett. 121, 121801 (2018), supplemental material]

e ⁺ e ^- b-jet

b-jet

b-tracks

e

^+/-

tracks

pp→ZH b + b pp→ZH

e ⁺ + e ^-

s = 13 TeV (2017)

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Observation of H → bb

◦ Useful: listings of Higgs-boson production cross-section by LHC Higgs XS Working Group

◦ Total number of H → bb events expected (13 TeV, m _H = 125 GeV):

prod. mode σ [pb] BR Lum. [fb ⁻¹ ] N(evts)

ggF 48.6 58 % 41.3 1164 · 10 ³

VBF 3.8 58 % 41.3 91 · 10 ³

V(0,1,2leptons)H 0.25 58 % 41.3 6 · 10 ³

Matthias Schr ¨oder – W/Z/Higgs an Collidern (Sommersemester 2019) Exercises No 6 3/10

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Higgs-Boson Production at the LHC

[TeV]

s 6 7 8 9 10 11 12 13 14 15

H+X) [pb] → (pp σ

− 2

10 − 1

10 1 10

10 2 M(H)= 125 GeV

LHC HIGGS XS WG 2016

H (N3LO QCD + NLO EW ) pp →

qqH (NNLO QCD + NLO EW) pp →

WH (NNLO QCD + NLO EW) pp →

ZH (NNLO QCD + NLO EW) pp →

ttH (NLO QCD + NLO EW) pp →

bbH (NNLO QCD in 5FS, NLO QCD in 4FS) pp →

tH (NLO QCD, t-ch + s-ch) pp →

LHC Higgs Cross Section Working Group

Higgs Production at the LHC

Gluon-Gluon Fusion g

g

H t

Associated Production with W and Z q

q

H

W/Z W/Z

Vector Boson Fusion q

q

q W/Z H

W/Z

Higgs Production Cross Section at the LHC

[TeV] 6 7 8 9 10 11 12 13 14 15 s

H+X) [pb] → (pp σ

− 2

10 − 1

10 1 10

10 2 M(H)= 125 GeV

H (N3LO QCD + NLO EW) pp →

[TeV] 6 7 8 9 10 11 12 13 14 15 s

H+X) [pb] → (pp σ

− 2

10 − 1

10 1 10

10 2 M(H)= 125 GeV

H (N3LO QCD + NLO EW) pp →

qqH (NNLO QCD + NLO EW) pp →

[TeV] 6 7 8 9 10 11 12 13 14 15 s

H+X) [pb] → (pp σ

− 2

10 − 1

10 1 10

10 2 M(H)= 125 GeV

H (N3LO QCD + NLO EW) pp →

qqH (NNLO QCD + NLO EW) pp →

WH (NNLO QCD + NLO EW) pp→

ZH (NNLO QCD + NLO EW) pp→

[TeV] 6 7 8 9 10 11 12 13 14 15 s

H+X) [pb] → (pp σ

− 2

10 − 1

10 1 10

10 2 M(H)= 125 GeV

H (N3LO QCD + NLO EW) pp →

qqH (NNLO QCD + NLO EW) pp →

WH (NNLO QCD + NLO EW) pp→

ZH (NNLO QCD + NLO EW) pp→

ttH (NLO QCD + NLO EW) pp →

bbH (NNLO QCD in 5FS, NLO QCD in 4FS) pp→

tH (NLO QCD, t-ch + s-ch) pp →

Associated Production with t and b

g t

H

t/b q q’

t H

W

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Particle-Flow Event Reconstruction

F. Beaudette at ICHEP2010

particle flow E _jet ≈ E _tracks + E _γ + E _n

Example: jet energy resolution at CMS (2010 conditions)

(GeV) p T

30 40 100 200 1000

T ) / p T (p σ

0.05 0.10 0.15 0.20 0.25

0.30 Simulation, | η | < 1.1 Calo Jets PF Jets

Matthias Schr ¨oder – W/Z/Higgs an Collidern (Sommersemester 2019) Exercises No 6 5/10

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Calibration of m ( jj )

[Phys. Rev. Lett. 121, 121801 (2018), supplemental material]

0 20 40 60 80 100 120 140 160

m(jj) [GeV]

0 0.5 1 1.5 2 2.5

Entries / 5 GeV

Kinematic fit + b-jet regression = 9.9 GeV = 120.7 GeV, σ µ b-jet regression

= 14.9 GeV σ = 124.3 GeV, µ PF-CHS jets

= 17.4 GeV σ = 115.9 GeV, µ

CMS

Simulation Supplementary

2017 (13 TeV)

) b ) H(b l- Powheg PYTHIA Z(l+

> 150 GeV T No recoil jets, pZ

0 20 40 60 80 100 120 140 160

m(jj) [GeV]

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

Entries / 5 GeV

Kinematic fit + b-jet regression = 12.4 GeV = 120.0 GeV, σ µ b-jet regression

= 15.4 GeV σ = 125.2 GeV, µ PF-CHS jets

= 17.9 GeV σ = 116.2 GeV, µ

CMS

Simulation Supplementary

2017 (13 TeV)

) b ) H(b l- Powheg PYTHIA Z(l+ > 150 GeV T 1 recoil jet, pZ

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Alternative Analysis: Fitting m ( jj )

[Phys. Rev. Lett. 121, 121801 (2018), supplemental material]

S/(S+B) weighted entries

5000 10000 15000 20000

Data WHb b

b

ggZHb ZHb b

VV+HF VV+LF

t

t Single top

b

W+b W+b

W+udscg Z+b b

Z+b Z+udscg

S+B uncertainty VH,H

→

b b

CMS

Supplementary

(13 TeV) 77.2 fb

-1

m(jj) [GeV]

60 80 100 120 140 160

Obs / Exp 0.95 1 1.05

m(jj) [GeV]

60 80 100 120 140 160

S/(S+B) weighted entries

0 500 1000

Data S+B uncertainty

b

→

b VH,H

b

→

b VZ,Z S+B uncertainty

CMS

Supplementary

(13 TeV) 77.2 fb

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Matthias Schr ¨oder – W/Z/Higgs an Collidern (Sommersemester 2019) Exercises No 6 7/10

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Classifier Output Signal Regions

[Phys. Rev. Lett. 121, 121801 (2018), supplemental material]

Entries

−2 10 1 102 104 106 108

Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

S+B uncertainty VH,H→bb T,V

, High p µ 2-

CMS Supplementary

(13 TeV) 41.3 fb-1

DNN output

0 0.2 0.4 0.6 0.8 1

Obs / Bkg 0.5 1 1.5 2

Entries

−2 10 1 102 104 106 108

109 Data WHbb

b

ZHb VV+HF

b

W+b W+b

W+udscg Z+bb

Z+b Z+udscg

t

t VV+LF

Single top S+B uncertainty b

→b VH,H µ) 1-lepton (

(13 TeV) 41.3 fb-1

0 0.2 0.4 0.6 0.8 1

Obs / Bkg 1 2

Entries

−2 10 1 102 104 106 108

Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

2-e, High p

(13 TeV) 41.3 fb-1

DNN output

0 0.2 0.4 0.6 0.8 1

Obs / Bkg 0.5 1 1.5 2

Entries

−2 10 1 102 104 106 108

109 Data WHbb

b

ZHb VV+HF

b

W+b W+b

W+udscg Z+bb

Z+b Z+udscg

t

t VV+LF

Single top S+B uncertainty b

→b VH,H 1-lepton (e)

(13 TeV) 41.3 fb-1

0 0.2 0.4 0.6 0.8 1

Obs / Bkg

2 4

Entries

−2 10 1 102 104 106 108 1010

Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

, Low p µ 2-

(13 TeV) 41.3 fb-1

DNN output

0 0.2 0.4 0.6 0.8 1

Obs / Bkg 0.5 1 1.5 2

Entries

−2 10 1 102 104 106 108 109

Data WHbb

b

ggZHb ZHbb

VV+HF VV+LF

t

t Single top

b

W+b W+b

W+udscg Z+bb

Z+b Z+udscg

S+B uncertainty VH,H→bb 0-lepton

(13 TeV) 41.3 fb-1

0 0.2 0.4 0.6 0.8 1

Obs / Bkg 0.5 1 1.5

Entries

−2 10 1 102 104 106 108

109 Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

2-e, Low p

(13 TeV) 41.3 fb-1

DNN output

0 0.2 0.4 0.6 0.8 1

Obs / Bkg 0.5 1 1.5

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Control Region Distributions

[Phys. Rev. Lett. 121, 121801 (2018), supplemental material]

Entries

0 500 1000 1500

Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

MC uncertainty enr.

b , Z+b , High pT,V µ 2-

(13 TeV) 41.3 fb-1

DeepCSVmin

0 0.2 0.4 0.6 0.8 1

Obs / Exp 0.95 1 1.05

Entries

0 10000 20000 30000

40000 _Data _WHb_b

b

ZHb VV+HF

b

W+b W+b

W+udscg Z+bb

Z+b Z+udscg

t

t VV+LF

Single top MC uncertainty enr.

b 1-lepton (e), W+b

(13 TeV) 41.3 fb-1

b

W+b tt W+LF W+b Top

Obs / Exp 0.95 1 1.05

Entries

0 200 400 600 800 1000 1200 1400

Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

b , Z+b 2-e, High pT,V

(13 TeV) 41.3 fb-1

DeepCSVmin

0 0.2 0.4 0.6 0.8 1

Obs / Exp 0.95 1 1.05

Entries

0 20000 40000 60000

Data WHbb

b

ZHb VV+HF

b

W+b W+b

W+udscg Z+bb

Z+b Z+udscg

t

t VV+LF

Single top MC uncertainty enr.

b ), W+b µ 1-lepton (

(13 TeV) 41.3 fb-1

b

W+b tt W+LF W+b Top

Obs / Exp 0.95 1 1.05

Entries

0 2000 4000 6000 8000 10000

12000 Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

b , Z+b , Low pT,V µ 2-

(13 TeV) 41.3 fb-1

DeepCSVmin

0 0.2 0.4 0.6 0.8 1

Obs / Exp 0.95 1 1.05

Entries

0 1000 2000 3000

Data WHbb

b

ggZHb ZHbb

b

W+b W+b

W+udscg Z+bb

Z+b Z+udscg

t

t VV+HF

VV+LF Single top

b 0-lepton, Z+b

(13 TeV) 41.3 fb-1

b

V+b tt V+LF V+b Top

Obs / Exp 0.95 1 1.05

Entries

0 2000 4000 6000

Data ggZHbb

b

ZHb VV+HF

b

Z+b Z+b

Z+udscg tt

VV+LF Single top

b , Z+b 2-e, Low pT,V

(13 TeV) 41.3 fb-1

DeepCSVmin

0 0.2 0.4 0.6 0.8 1

Obs / Exp 0.95 1 1.05

Matthias Schr ¨oder – W/Z/Higgs an Collidern (Sommersemester 2019) Exercises No 6 9/10

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All Bins in Fit

[Phys. Rev. Lett. 121, 121801 (2018), supplemental material]

Entries

1 10 10 2

10 3

10 4

10 5

10 6 ^Data _Background

b

→ b VH,H

Background uncertainty Signal + Background

CMS

Supplementary

(13 TeV) 41.3 fb

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Teilchenphysik 2 — W/Z/Higgs an Collidern