EWK precision measurements in CMS · I. Gorbunov [email protected] EWK at CMS 4/12. W rapidity, helicity and diﬀerential xsection - 2 - 1.5 - 1 - 0.5 0 0.5 1 1.5 2 lepton h

EWK precision measurements in CMSLHCP2020: 8th Edition of the Large Hadron Collider Physics

Conference, 25-30 May 2020, Online

I. Gorbunov on behalf of the CMS Collaboration

JINR, Dubna

May 25, 2020

I. Gorbunov [email protected] EWK at CMS 1/12

Motivation

Testing Standard model (SM)

Constraining parton distribution functions (PDFs)

Extracting parameters

Background evaluation

Testing different Monte Carlo models

Testing production mechanism dynamics

Precise measurements with a hadron collider!


Results Overview [p

b]σ

Pro

duct

ion

Cro

ss S

ectio

n,

4−10

3−10

2−10

1−10

1

10

210

310

410

510

CMS PreliminaryApril 2020

All results at: http://cern.ch/go/pNj7

W

n jet(s)≥

Z

n jet(s)≥

γW γZ WWWZ ZZ VVV WWW WWZ WZZ ZZZ γWV γγZ γγW

µll, l=e,→, Zνl→: fiducial with Wγγ,WγγEW,ZqqWEW

qqZEW

WW→γγ

γqqWEW

ssWW EW

γqqZEW

qqWZEW

qqZZEW tt

=n jet(s)

t-cht tW

s-cht γtt tZq ttZ γt ttW tttt

σ∆ in exp. H

σ∆Th. ggH

qqHVBF VH WH ZH ttH tH HH

CMS 95%CL limits at 7, 8 and 13 TeV

)-1 5.0 fb≤7 TeV CMS measurement (L )-1 19.6 fb≤8 TeV CMS measurement (L )-1 137 fb≤13 TeV CMS measurement (L

Theory prediction

CMS have a large EWK cross section measurement programI. Gorbunov [email protected] EWK at CMS 3/12

Di-boson cross section ratio comparison to theory

theoσ / expσProduction Cross Section Ratio: 0.5 1 1.5 2

CMS PreliminaryApril 2020

All results at:http://cern.ch/go/pNj7

γγ 0.12± 0.01 ±1.06 -15.0 fb(NLO th.), γW 0.13± 0.03 ±1.16 -15.0 fb

(NLO th.), γZ 0.05± 0.01 ±0.98 -15.0 fb(NLO th.), γZ 0.05± 0.01 ±0.98 -119.5 fb

WW+WZ 0.14± 0.13 ±1.01 -14.9 fbWW 0.09± 0.04 ±1.07 -14.9 fbWW 0.08± 0.02 ±1.00 -119.4 fbWW 0.06± 0.01 ±1.00 -135.9 fbWZ 0.06± 0.07 ±1.05 -14.9 fbWZ 0.07± 0.04 ±1.02 -119.6 fbWZ 0.05± 0.02 ±0.96 -135.9 fbZZ 0.07± 0.13 ±0.97 -14.9 fbZZ 0.08± 0.06 ±0.97 -119.6 fbZZ 0.04± 0.02 ±1.06 -1137 fb

7 TeV CMS measurement (stat,stat+sys)



CMS measurements theory(NLO)vs. NNLO

There are new 13 TeV di-boson measurementsI. Gorbunov [email protected] EWK at CMS 4/12

W rapidity, helicity and differential xsection

2− 1.5− 1− 0.5− 0 0.5 1 1.5 2

ηlepton

0

500

1000

1500

2000

2500

3000

3500

4000

4500

310×

Eve

nts

di-bosons Top ντ→W

QCD Drell-Yan 0+W

R+W L

+W data

Preliminary CMS (13 TeV)-135.9 fb

26 28 30 32 34 36 38 40 42 44

(GeV)T

lepton p

0

2

4

6

8

10

12

610×

Eve

nts


QCD Drell-Yan 0+W

R+W L

+W data


) binT

,pηunrolled lepton (

0

50

100

150

200

250

300

310×

Eve

nts


QCD Drell-Yan 0+W

R+W L

+W data


[ 26, 27]∈ T

p [ 27, 28]∈ T

p [ 28, 29]∈ T

p [ 29, 30]∈ T

p [ 30, 31]∈ T

p [ 31, 32]∈ T

p [ 32, 33]∈ T

p [ 33, 34]∈ T

p [ 34, 35]∈ T

p [ 35, 36]∈ T

p [ 36, 37]∈ T

p [ 37, 38]∈ T

p [ 38, 39]∈ T

p [ 39, 40]∈ T

p [ 40, 41]∈ T

p [ 41, 42]∈ T

p [ 42, 43]∈ T

p [ 43, 44]∈ T

p [ 44, 45]∈ T

p

0 100 200 300 400 500 600 700 800 900) bin

T,pηunrolled lepton (

0.98

1.00

1.02

Dat

a/pr

ed.

35.9 fb−1 used, η, pT and unrolled distributions for W + → µ+νCMS-PAS-SMP-18-012


http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/SMP-18-012/index.html

W double differential xsection and charge asymmetry

0.005

0.01

0.015

0.02

0.025

0.03

0.035

0.04

0.045

0.05

[1/G

eV]

tot

σ /

T|d

pη

/d|

σ2 d

measured aMC@NLO Sα ⊕PDFs

[26, 28]

∈ Tp

[28, 30]

∈ Tp

[30, 31.5]

∈ Tp

[32, 33]

∈ Tp

[33, 34.5]

∈ Tp

[34, 36]

∈ Tp

[36, 37.5]

∈ Tp

[38, 39]

∈ Tp

[39, 40.5]

∈ Tp

[40, 42]

∈ Tp

[42, 43.5]

∈ Tp

[44, 45]

∈ Tp

[45, 46.5]

∈ Tp

[46, 48]

∈ Tp

[48, 50]

∈ Tp

[50, 52]

∈ Tp

[52, 54]

∈ Tp

[54, 56]

∈ Tp

measured aMC@NLO Sα ⊕PDFs ν l→ +W


50 100 150 200 250 300

[0.0, 2.4]∈| η| bin: |ηunrolled |

0.9

0.95

1

1.05

1.1

obs.

/exp

.

0.01

0.02

0.03

0.04

0.05

[1/G

eV]

tot

σ /

T|d

pη

/d|

σ2 d

measured aMC@NLO Sα ⊕PDFs

[26, 28]

∈ Tp

[28, 30]

∈ Tp

[30, 31.5]

∈ Tp

[32, 33]

∈ Tp

[33, 34.5]

∈ Tp

[34, 36]

∈ Tp

[36, 37.5]

∈ Tp

[38, 39]

∈ Tp

[39, 40.5]

∈ Tp

[40, 42]

∈ Tp

[42, 43.5]

∈ Tp

[44, 45]

∈ Tp

[45, 46.5]

∈ Tp

[46, 48]

∈ Tp

[48, 50]

∈ Tp

[50, 52]

∈ Tp

[52, 54]

∈ Tp

[54, 56]

∈ Tp

measured aMC@NLO Sα ⊕PDFs ν l→ -W


50 100 150 200 250 300

[0.0, 2.4]∈| η| bin: |ηunrolled |

0.9

0.95

1

1.05

1.1

obs.

/exp

.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

char

ge a

sym

met

ry measured aMC@NLO Sα ⊕PDFs

[26, 28]

∈ Tp

[28, 30]

∈ Tp

[30, 31.5]

∈ Tp

[32, 33]

∈ Tp

[33, 34.5]

∈ Tp

[34, 36]

∈ Tp

[36, 37.5]

∈ Tp

[38, 39]

∈ Tp

[39, 40.5]

∈ Tp

[40, 42]

∈ Tp

[42, 43.5]

∈ Tp

[44, 45]

∈ Tp

[45, 46.5]

∈ Tp

[46, 48]

∈ Tp

[48, 50]

∈ Tp

[50, 52]

∈ Tp

[52, 54]

∈ Tp

[54, 56]

∈ Tp

measured aMC@NLO Sα ⊕PDFs ν l→W


50 100 150 200 250 300

[0.0, 2.4]∈| η| bin: |ηunrolled |

0.1−0.05−

0

0.05

0.1

obs.

-exp

.

35.9 fb−1 used, W + → lν (top), W− → lν (middle), chargeasymmetry (bottom) CMS-PAS-SMP-18-012


http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/SMP-18-012/index.html

Drell-Yan differential cross section at 13 TeV/d

m [p

b/G

eV]

σd

7−10

6−10

5−10

4−10

3−10

2−10

1−10

1

10

210

310

Data

aMC@NLO

FEWZ (NNLO QCD + NLO EW)

CMS (13 TeV)-12.8 fb

µµ → Ζ* /γ

210

3

10

aMC

@N

LO/D

ata

0.40.60.8

11.21.41.6 Stat. unc. Tot. unc. Theo. unc. (aMC@NLO)

m [GeV]20 30 40 100 200 300 1000 2000

FE

WZ

/Dat

a

0.40.60.8

11.21.41.6 Stat. unc. Tot. unc. Theo. unc. (FEWZ)

Measured at 7, 8 and13 TeV

At 13 TeV measured in theinvariant mass range from15 to 3000 GeV using2.8 fb−1 of 2015 data

JHEP 12 (2019) 059

) [GeV]µµm (

/dm

[pb/

GeV

]σd

7−10

6−10

5−10

4−10

3−10

2−10

1−10

1

10

210

Data

FEWZ (NNLO QCD + NLO EW)

CMS ) (13 TeV)µµ (-1 (ee) 2.8 fb-12.3 fb-µ+µ, -e+ e→*/Z γ

m [GeV]20 30 100 200 1000 2000T

heor

y/D

ata

0.5

1

1.5 Stat. unc. Tot. unc. Theo. unc. (FEWZ)

m (post-FSR) [GeV]20 30 40 100 200 300 1000 2000

Fra

ctio

n of

eve

nts

0

0.2

0.4

0.6

0.8

1

Α

ε

ε × Α

SimulationCMS 13 TeV

µµ → Ζ* /γ


http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-17-001/index.html

Z production cross section at 13 TeV

[GeV]ZT

p1 10 210 310

[1/G

eV]

Z T/d

pσ

dσ1/

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14 DataMINLOaMC@NLOPOWHEG

CMS

-e+, e-µ+µ → *γZ/

> 25 GeVT

| < 2.4, pη|

(13 TeV)-135.9 fb

[GeV]ZT

p1 10 210 310

MIN

LO/D

ata

0.8

1.0

1.2

PO

WH

EG

/Dat

a

0.8

1.0

1.2

aMC

@N

LO/D

ata

0.8

1.0

1.2

CMS

Z

Tdp

σd σ1 > 25 GeV

T| < 2.4, pη| -e+, e-µ+µ → *γZ/

(13 TeV)-135.9 fb

*η

φ3−10 2−10 1−10 1 10

* ηφ/dσ

dσ1/

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14 DataMINLOaMC@NLOPOWHEG

CMS

-e+, e-µ+µ → *γZ/

> 25 GeVT

| < 2.4, pη|

(13 TeV)-135.9 fb

*η

φ3−10 2−10 1−10 1 10

MIN

LO/D

ata

0.8

1.0

1.2

PO

WH

EG

/Dat

a

0.8

1.0

1.2

aMC

@N

LO/D

ata

0.8

1.0

1.2

CMS

*η

φdσd σ

1 > 25 GeVT

| < 2.4, pη| -e+, e-µ+µ → *γZ/

(13 TeV)-135.9 fb

|Z|y

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4

Z/d

yσ

dσ1/

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14 DataaMC@NLOPOWHEGFEWZ

CMS

-e+, e-µ+µ → *γZ/

> 25 GeVT

| < 2.4, pη|

(13 TeV)-135.9 fb

|Z|y

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4

FE

WZ

/Dat

a

0.9

1.0

1.1

PO

WH

EG

/Dat

a

0.9

1.0

1.1

aMC

@N

LO/D

ata

1.0

1.2

CMS

|Zd|yσd σ

1 > 25 GeVT

| < 2.4, pη| -e+, e-µ+µ → *γZ/

(13 TeV)-135.9 fb

Source Z→ µµ (%) Z→ ee (%)Luminosity 2.5 2.5Muon reconstruction efficiency 0.4 —Muon selection efficiency 0.7 —Muon momentum scale 0.1 —Electron reconstruction efficiency — 0.9Electron selection efficiency — 1.0Electron momentum scale — 0.2Background estimation 0.1 0.1Total (excluding luminosity) 0.8 1.4

Cross section σB [pb]σZ→µµ 694 ± 6 (syst) ± 17 (lumi)σZ→ee 712 ± 10 (syst) ± 18 (lumi)σZ→`` 699 ± 5 (syst) ± 17 (lumi)

pT , φ?η, Y are measured

using both electrons andmuons

35.9 fb−1 of 13 TeV2016 data used

CMS-PAS-SMP-17-010,JHEP 12 (2019) 061




Angular coefficients at 8 TeV

d2σdcosθ?dφ? ∝(1 + cos2θ?) +A0

12 (1−

3cos2θ?) +A1sin(2θ?)cosφ?+A2

12 sin2θ?cos(2φ?)+

A3sinθ?cosφ? +A4cosθ? +A5sin

2θ?sin(2φ?)+A6sin(2θ?)sinφ?+A7sinθ?sinφ?

Lam-Tungrelation violated

Strong |y | andqT dependence

Eur. Phys. J. C(2016) 76: 325




Weak mixing angle using AFB at 8 TeVE

vent

s / 0

.05

20

40

60

80

310× (8 TeV)-118.8 fb

CMSPreliminary

| < 1.2µµ |Y≤0.8

Dataµµ →* γZ / ττ →* γZ /

DibosonsJets

, tXtt

*θcos1− 0.5− 0 0.5 1

Dat

a / M

C

0.9

1

1.1

Data MC (stat) sys)⊕MC (stat

(GeV)µµM

FB

A

0.2−

0

0.2

0.4| < 0.4µµ |Y≤0.0 | < 0.8µµ |Y≤0.4 | < 1.2µµ |Y≤0.8 | < 1.6µµ |Y≤1.2 | < 2.0µµ |Y≤1.6 | < 2.4µµ |Y≤2.0

(8 TeV)-118.8 fbCMS Preliminary

Data

Fit

(GeV)µµM

Dat

a -

Fit

0.05−

0

0.05

70 90 110 70 90 110 70 90 110 70 90 110 70 90 110 70 90 110

∼ 19 fb−1 of 8 TeV data used

The statistical and systematicuncertainties are significantly reduced

Fit of experimental AFB with theory

CMS-PAS-SMP-16-007, Eur. Phys. J. C78 (2018) 701

(GeV)llM60 70 80 90 100 110 120

FB

A

0.8−

0.6−

0.4−

0.2−

0

0.2

0.4

0.6

0.8

PYTHIA 8

LO NNPDF3.0

| < 0.4ll

0.0 < |Y

| < 0.8ll

0.4 < |Y

| < 1.2ll

0.8 < |Y

| < 1.6ll

1.2 < |Y

| < 2.0ll

1.6 < |Y

| < 2.4ll

2.0 < |Y

FB

A

0.2−

0

0.2

Powheg

(GeV)llM70 80 90 100 110

FB

A∆

0.005−

0

0.005

0.0012±0.0008, ±0.0004, ± = effθ2sinδ

NNPDF3.0 uncertainty

NNPDF3.0 replicas




Weak mixing angle using AFB at 8 TeV (II)One of the most precisemeasurements

PDF are constrained in-situ

sin2θlepteff =

0.23101± 0.00036(stat)±0.00018(syst)±0.00016(theory)±0.00030(pdf )

CMS-PAS-SMP-16-007,Eur. Phys. J. C 78 (2018)701

Can reach better precisionthen LEP+SPD after LHCand CMS upgradeCMS-PAS-FTR-17-001

lept

effθ2sin0.23 0.231 0.232 0.233

0

1

2

3

4

5

6

7

8

9

10

LEP + SLD

0,b

FBLEP + SLD: A

lSLD: A

-1 9.4 fbµµCDF ee+

-1D0 ee 9.7 fb

-1 4.8 fbµµATLAS ee+

-1 3 fbµµLHCb

CMS -1 18.8 fbµµPreliminary

CMS -1ee 19.6 fbPreliminary

CMS µµee+Preliminary

0.00016±0.23153

0.00029±0.23221

0.00026±0.23098

0.00046±0.23221

0.00047±0.23147

0.00120±0.23080

0.00106±0.23142

0.00060±0.23125

0.00086±0.23056

0.00052±0.23101





http://cds.cern.ch/record/2294888

Conclusion

High precision measurements

Some channels are analyzed at 13 TeV

SM predictions tested

PDFs constrained

W xsection and helicity measurements

High precision weak mixing angle measurements available

Zoom Link for Followup discussion:https://cern.zoom.us/j/92177973489?pwd=RGJGTTdEK3oxUHIyaGVrQk51eWpPdz09Conference ID: 921 7797 3489Password: LHCP-05/25


Documents

EWK precision measurements in CMS · I. Gorbunov [email protected] EWK at CMS 4/12. W rapidity, helicity and diﬀerential xsection - 2 - 1.5 - 1 - 0.5 0 0.5 1 1.5 2 lepton h