COMPARING SIGNAL REGIONS TO OPTIMIZE ALL HADRONIC … · CERNAND THE LHC • European Center for Nuclear Research (CERN) • Located near Geneva, Switzerland • Site of the Large

COMPARINGSIGNALREGIONSTOOPTIMIZEALLHADRONIC𝑊′ → 𝑋ℎ → 𝑞𝑞'(𝑏𝑏' SEARCHES

CARLMARTH

2/8/17

1

OUTLINE

• Introduction

• CERNandtheLHC

• ATLASdetector

• StandardModel

• Dibosonresonances

• Physicsobjectdefinitions

• Searchstrategy

• DataandMC

• Eventreconstruction

• Pre-selection

• Regiondefinitions

• Higgs,𝑋,and𝑊′ reconstruction

• Multijet modeling

• Significance

• Conclusion

2

CERN ANDTHELHC

• EuropeanCenterforNuclearResearch(CERN)

• LocatednearGeneva,Switzerland

• SiteoftheLargeHadronCollider

• LargeHadronCollider(LHC)

• Currentlylargestparticleacceleratorintheworld

• Acceleratesprotonbunchestonearlyspeedoflight

• Fourmaincollisionsites:ATLAS,CMS,ALICE,andLHCb

• Operatesat 𝑠� = 13TeV asof2015

3

ATLASDETECTOR

• Cylindricalgeometry

• Innerdetector( 𝜂 < 2.5)• Usestrackingtomeasurechargeandmomentumofparticles as

theypassthrough2T axialmagneticfield

• Electromagnetic(EM)andhadroniccalorimeters• Tilehadroniccalorimter ( 𝜂 < 1.7)

• LiquidArgon(LAr)calorimeter( 𝜂 < 4.9)• Fourparts- EMbarrel,EMendcap,hadronicendcap,forward

calorimeters

• Muonspectrometer• Measureschargeandmomentumofmuonsastheypassthrough

atoroidalmagneticfield

4

STANDARDMODEL

• Formulatedin1970stodescribeelementaryparticlesandtheforcesmediatingtheinteractionsbetweenthem

• Particlessplitintofermionsandbosons

• Fermions- half-integerspin,includethequarksandtheleptons

• Bosons- integerspin,includethegaugebosonsandthescalarboson

5

DIBOSONRESONANCES

• Predictedbymanybeyond-the-Standard-Model(BSM)theories

• Currentlynoevidencefoundtovalidateexistence,despitemultiplededicatedsearchesusingtheLHC

• Currentanalysisfocuseson𝑊( → 𝑋ℎ resonantstate

• 𝑋 anewparticle,ℎ aHiggsboson

• Assumesallhadronicdecays:𝑊( → 𝑋ℎ → 𝑞𝑞'(𝑏𝑏'

6

PHYSICSOBJECTDEFINITIONS

• Hadronicjetsreconstructedusinganti-𝑘< algorithm• Large-𝑅 jetsreconstructedfromtopologicalcalorimeterclusterswithradiusparameter

𝑅 = 1.0• Trackjetsreconstructedfrominnerdetectortrackswithradiusparameter𝑅 = 0.2

• Associatedtolarge-𝑅 jetsusingghost-association

• Large-𝑅 jetstaggedwithtwo-prongstructureusingselectionon𝐷@(BCD)

• Variabletrainingontrue𝑊/𝑍 bosontodefineefficiencyworkingpoints

• 50%workingpointsusedhere

• Trackjets𝑏-taggedusingMV2c10• Multivariatediscriminantusingdisplacedverticestoidentifyheavy-flavorjets

• Variabletrainingon𝑡𝑡̅ eventstodefineefficiencyworkingpoints

• 77%workingpointusedhere

• Eventswithatleastoneleptonremovedfromconsideration7

SEARCHSTRATEGY

• High𝑊′mass⟹ assume𝑋 andHiggshaveconsiderablekineticenergyandsohigh𝑝L• Impliesthat𝑋 → 𝑞𝑞'′ andℎ → 𝑏𝑏' decayshavesmallopeningangle,i.e.aboosted/mergeddecaytopology

• Higgsand𝑋 reconstructedfromsinglelarge-𝑅 jetsandidentifiedusingthelarge-𝑅 jetmassandtrackjet𝑏-tagging,alongwiththetwo-prongedsubstructureselection

• Definetwonon-orthogonalsignalregionswithdifferentHiggsmasswindowsandcompareresultantsignalsensitivity

8

DATAANDMC

• Data• CollectedbyATLASdetectorat 𝑠� = 13TeV during2015and2016𝑝𝑝 collisions• Totalintegratedluminosityof36fbPD

• Signal(MadGraph5_aMC@NLO+Pythia8.186)• UseXHsamplesscaledto1pb crosssection• 100samplesused,𝑊′massbetween1000GeVand4000GeV,𝑋 massbetween65GeVand900GeV

• Background• MajorsourceexpectedtobeQCDmultijet,modeledhereusingdata-drivenestimate

• Minorbackgroundsmodeledwithsimulation• 𝑡𝑡̅ (Powheg-Box+Pythia6.428)

• 𝑉 + jets (Sherpa2.1)

9

EVENTSELECTION

Pre-selection• Beforeanalysis

• Allhadronicrequirementenforced

• Large-𝑅 jetswith𝑝L < 200GeV notconsideredforanalysis

• Eventswithfewerthan2large-𝑅 jetsnotconsidered

• Eventsmusthaveatleastonelarge-𝑅 jetwith𝑝L > 450GeV

• Beginningofanalysis

• Large-𝑅 jetswith𝑝L < 250GeV, 𝜂 < 2.0,or𝑚 < 50GeV discarded

• Eventswithfewerthan2remaininglarge-𝑅 jetsdroppedfromconsiderationintheanalysis

• Onlyleading2large-𝑅 jetskept

• High𝑊′massimpliesboostedHiggsand𝑋

• Anyotherlarge-𝑅 jetexpectedfrompile-up

• Onelarge-𝑅 jetmusthaveatleasttwoassociatedtrackjetswith𝑝L > 20GeV and𝜂 < 2.5,andleadingtwoarekept

• Higgsdijet decay

• Remark:ifbothhavetwosuchtrackjets,leadingtwokeptforboth

10

EVENTSELECTIONSignalRegion(SR\)forgivenmassthreshold𝑀• Atleastonelarge-𝑅 jetwith𝑀GeV < 𝑚 < 145GeV andtwotrackjets

• Otherlarge-𝑅 jetpassesthe𝐷@(BCD) substructureselection

HighSideBand(HSB\)forgivenmassthreshold𝑀• MustfailSR\requirements

• Atleastonelarge-𝑅 jetwith145GeV < 𝑚 < 200GeV andtwotrackjets• Upperboundchosentoavoidkinematicdifferencesathighmass

• Otherlarge-𝑅 jetpassesthesubstructureselection

𝑀 = 75GeV and𝑀 = 95GeV examined11

EVENTRECONSTRUCTION

Higgs,𝑋,and𝑊′ reconstruction• Higgsdefinedasthetwo-track-jetlarge-𝑅 jetintherelevantmasswindowwithotherjetpassingthe

substructureselection

• Ambiguity• Ifbothlarge-𝑅 jetssatisfytherequirements,onewithmore𝑏-tagschosenasHiggs

• Ifambiguitycontinuesandbothhavezero𝑏-tags,large-𝑅 jetwithmoretrackjetschosenasHiggs

• Ifambiguitycontinuesorbothhaveatleastone𝑏-tag,leadinglarge-𝑅 jetischosenasHiggs

• 𝑋 definedaslarge-𝑅 jetthatisnottheHiggs

• 𝑊( definedasthe4-vectorsumoftheHiggsjetandthe𝑋 jet

12

EVENTRECONSTRUCTION

Splittingregionsby𝑏-tag• SR\ andHSB\ splitbynumberofHiggs𝑏-tags

• ChannelsreferredtoasSR\` orHSB\` ,where𝑀 isthemassthresholdand𝑖 isthenumberof𝑏-tags

13

EVENTRECONSTRUCTION

Data-drivenmultijet estimation• Modeledbyre-weightofdataminussimulatedbackground(multijet dataorData– Vjets - 𝑡𝑡̅)inthe0-

tagchanneltoreproducethe1- and2-tagchannels

14

EVENTRECONSTRUCTION

Data-drivenmultijet estimation• Expectedthatdifferencesinchannelscomefromkinematicchangesarisingfrom𝑏-tagging,whichhas

efficiencydependentupon𝑝L and𝜂

15

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

210

310

410

510

610

710

810 095

, HSBtData - Vjets - t

)095

(norm. to HSB

295


ATLAS Work in progress-1 L dt = 36.1 fb∫

= 13 TeVs

Th sub-leading track jet p

[GeV]T

p0 500 1000 1500 2000 2500

0 95/H

SB2 95

HSB

0.50.60.70.80.9

11.11.21.31.41.5

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

210

310

410

510

610

710

810095


)095

(norm. to HSB

295



= 13 TeVs

Th leading track jet p

[GeV]T

p0 500 1000 1500 2000 2500

0 95/H

SB2 95

HSB

0.50.60.70.80.9

11.11.21.31.41.5

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

10

210

310

410

510

610

710

810

910095


)095

(norm. to HSB

195



= 13 TeVs


[GeV]T

p0 500 1000 1500 2000 2500

0 95/H

SB1 95

HSB

0.50.60.70.80.9

11.11.21.31.41.5

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

10

210

310

410

510

610

710

810

910

095


)095

(norm. to HSB

195



= 13 TeVs


[GeV]T

p0 500 1000 1500 2000 2500

0 95/H

SB1 95

HSB

0.50.60.70.80.9

11.11.21.31.41.5

EVENTRECONSTRUCTION

Data-drivenmultijet estimation• WeightsderivedfromHiggsleadingandsub-leadingtrackjet𝑝L distributionsinHSBbc,withfirst

iterationweightsdefinedastheproductoftheratiosHSBbc` HSBbcde intheappropriatebinsoftheleadingandsubleadingdistributions

• Remark1:beforetheratioistaken,theHSBbc` isscaledtotheHSBbcd tokeeptheweightsontheorderofone

• Remark2:𝑝L distributionsarere-binnedtohavepositivebincontentandbinerrornogreaterthan30%

• SeconditerationperformedusingratiosoftheHSBbc` andtheappropriatere-weightoftheHSBbcd

• Finalweightdefinedasproductoffirstandseconditerationweights

16

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

210

310

410

510

610

710

810 (RW)095


(RW))095

(norm. to HSB

295



= 13 TeVs


[GeV]T

p0 500 1000 1500 2000 2500

(RW

)0 95

/HSB

2 95H

SB 0.50.60.70.80.9

11.11.21.31.41.5

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

210

310

410

510

610

710

810(RW)0

95, HSBtData - Vjets - t

(RW))095

(norm. to HSB

295



= 13 TeVs


[GeV]T

p0 500 1000 1500 2000 2500

(RW

)0 95

/HSB

2 95H

SB 0.50.60.70.80.9

11.11.21.31.41.5

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

10

210

310

410

510

610

710

810

910(RW)0

95, HSBtData - Vjets - t

(RW))095

(norm. to HSB

195



= 13 TeVs


[GeV]T

p0 500 1000 1500 2000 2500

(RW

)0 95

/HSB

1 95H

SB 0.50.60.70.80.9

11.11.21.31.41.5

0 500 1000 1500 2000 2500

Eve

nts

/ 50.

0 G

eV

10

210

310

410

510

610

710

810

910

(RW)095


(RW))095

(norm. to HSB

195



= 13 TeVs


[GeV]T

p0 500 1000 1500 2000 2500

(RW

)0 95

/HSB

1 95H

SB 0.50.60.70.80.9

11.11.21.31.41.5

17

RE-WEIGHTEDDISTRIBUTIONS

EVENTRECONSTRUCTION

Data-drivenmultijet estimation• Onceweightsderived,themultijet backgroundinagivenregionand𝑏-tagchannelisdefinedasthe

appropriatere-weightofthe0-tagchannelofthatregion,scaledtothenumberofeventsinthegivenchanneloftheregion

18

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Eve

nts

/ 100

.0 G

eV

1−101

10

210

310

410

510

610

710

810

910Z+jets W+jetstt MultijetData


= 13 TeVs175HSB

Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Eve

nts

/ 100

.0 G

eV

1−10

1

10

210

310

410

510

610

710 Z+jets W+jetstt MultijetData


= 13 TeVs275HSB

Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Eve

nts

/ 100

.0 G

eV

1−101

10

210

310

410

510

610

710

810



= 13 TeVs195HSB

Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Eve

nts

/ 100

.0 G

eV

1−10

1

10

210

310

410

510

610



= 13 TeVs295HSB

Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 100 200 300 400 500 600 700 800 900 1000

Eve

nts

/ 20.

0 G

eV

1−101

10

210

310

410

510

610

710

810



= 13 TeVs175HSB

X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 100 200 300 400 500 600 700 800 900 1000

Eve

nts

/ 20.

0 G

eV

3−10

2−10

1−101

10

210

310

410

510

610

710



= 13 TeVs275HSB

X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 100 200 300 400 500 600 700 800 900 1000

Eve

nts

/ 20.

0 G

eV

1−101

10

210

310

410

510

610

710

810



= 13 TeVs195HSB

X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 100 200 300 400 500 600 700 800 900 1000

Eve

nts

/ 20.

0 G

eV

3−10

2−10

1−101

10

210

310

410

510

610

710



= 13 TeVs295HSB

X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000

Dat

a/Bk

g

0.40.60.8

11.21.41.6

19

SIGNALSIGNIFICANCE

Definitions• Significanceofagivensignalinagivenregiondefinedasthe

signaltobackgroundratiointheregion

• Differenceinsignificanceoftworegionsforasignaldefinedasthepercentdifferenceofthesignificances

20

SIGNALSIGNIFICANCE

Calculatingsignificancein𝑚f and𝑚fg windows• Foreachsample,masswindowschosenabouttheappropriate𝑋 and𝑊′masses

• 𝑚f windowdefinitionforgivensample• 𝑚f distributionincombinedSRbcD + SRbc@ channelfittedtoGaussian

• Fitrangerestrictedtostartat0.7𝑀f (where𝑀f isthetruth𝑋 mass)andtoendat1TeV

• Meanrestrictedtovaryinrange(0.8𝑀f, 1.2𝑀f)

• Windowdefinedasintervalcenteredaboutthefittedmeanwithhalf-widthequalto1.5timesthefittedstandarddeviation

• 𝑚fg windowforgivensamplecalculatedsimilarlywith𝑚fg distributionincombined SRbcD + SRbc@ channelrestrictedtothealreadycalculated𝑚f window

• SeparatewindowscalculatedusingthecombinedSRjcD + SRjc@ channeltoavoidbias21

FITTEDDISTRIBUTIONSINSR95

Constant 50.7± 4132

Mean 0.1± 112.6

Sigma 0.083± 9.559

[GeV]Xm0 100 200 300 400 500 600 700

Even

ts

1000

2000

3000

4000

5000

6000

7000 ATLAS Work in progress-1 L dt = 36.1 fb∫

= 13 TeVs


Mean 1.0± 1767

Sigma 0.63± 73.49

[GeV]W’m500 1000 1500 2000 2500 3000 3500

Even

ts

500

1000

1500

2000

2500

3000

3500 ATLAS Work in progress-1 L dt = 36.1 fb∫

= 13 TeVs


Mean 0.3± 393.3

Sigma 0.25± 23.15

[GeV]Xm0 100 200 300 400 500 600 700 800 900

Even

ts

500

1000

1500

2000

2500

3000ATLAS Work in progress

-1 L dt = 36.1 fb∫ = 13 TeVs

Constant 11.7± 729

Mean 1.8± 2925

Sigma 1.1± 102.6

[GeV]W’m1500 2000 2500 3000 3500

Even

ts

200

400

600

800

1000

1200


-1 L dt = 36.1 fb∫ = 13 TeVs

𝑚f = 110GeV,𝑚fg = 1800GeV 𝑚f = 400GeV,𝑚fg = 3000GeV

22

FITTEDDISTRIBUTIONSINSR75

𝑚f = 110GeV,𝑚fg = 1800GeV 𝑚f = 400GeV,𝑚fg = 3000GeV


Mean 0.1± 112.6

Sigma 0.077± 9.489

[GeV]Xm0 100 200 300 400 500 600 700

Even

ts

1000

2000

3000

4000

5000

6000

7000


-1 L dt = 36.1 fb∫ = 13 TeVs


Mean 1.1± 1760

Sigma 0.7± 77

[GeV]W’m500 1000 1500 2000 2500 3000 3500

Even

ts

500

1000

1500

2000

2500

3000

3500

4000


= 13 TeVs


Mean 0.3± 393.4

Sigma 0.24± 23.19

[GeV]Xm0 100 200 300 400 500 600 700 800 900

Even

ts

500

1000

1500

2000

2500

3000

3500


= 13 TeVs

Constant 11.9± 751.1

Mean 1.8± 2919

Sigma 1.1± 105

[GeV]W’m1500 2000 2500 3000 3500

Even

ts

200

400

600

800

1000

1200


-1 L dt = 36.1 fb∫ = 13 TeVs

23

SIGNALSIGNIFICANCE

Calculatingsignificancein𝑚f and𝑚fg windows• Oncewindowscalculatedforeachsampleandsignalregion,significancecalculatedasratioofsignalto

backgroundinthesignalregionrestrictedtothewindows

24

SIGNIFICANCEINSR95 WINDOWS

1 95 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1−10

1

10

210

1.1e-01 8.1e-02 6.3e-02 5.4e-02

3.1e-01 2.2e-01 1.8e-01 1.3e-01 1.1e-01 1.2e-01

8.8e-01 5.9e-01 5.0e-01 3.5e-01 3.3e-01 4.4e-01 5.4e-01

2.1e+00 1.4e+00 1.3e+00 9.0e-01 1.1e+00 1.5e+00 2.4e+00

3.6e+00 2.6e+00 2.3e+00 1.6e+00 1.7e+00 1.9e+00 2.7e+00 5.1e+00 1.4e+00

7.1e+00 4.6e+00 4.6e+00 3.4e+00 3.6e+00 4.1e+00 5.6e+00 1.2e+01 2.1e+01

1.4e+01 9.7e+00 8.6e+00 6.1e+00 5.9e+00 7.1e+00 9.9e+00 2.1e+01 3.8e+01 5.2e+01

2.5e+01 1.9e+01 1.8e+01 1.2e+01 1.3e+01 1.6e+01 3.4e+01 6.8e+01 1.1e+02 1.3e+02

5.0e+01 4.3e+01 3.2e+01 2.2e+01 2.1e+01 2.5e+01 2.5e+01 5.0e+01 9.7e+01 1.4e+02 1.6e+02 2.5e+02

7.6e+01 7.8e+01 6.6e+01 4.6e+01 4.8e+01 4.3e+01 4.9e+01 8.2e+01 1.7e+02 3.6e+02 5.1e+02 6.4e+02 3.2e+02

1.1e+02 1.1e+02 1.0e+02 7.5e+01 6.5e+01 6.4e+01 6.6e+01 1.0e+02 1.8e+02 2.4e+02 6.5e+02 4.2e+02 8.0e+02

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

2 95 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1

10

210

310

1.7e+00 1.2e+00 9.2e-01 8.6e-01

4.2e+00 3.0e+00 2.4e+00 1.8e+00 1.7e+00 1.8e+00

1.1e+01 7.4e+00 6.3e+00 4.6e+00 4.1e+00 5.4e+00 7.1e+00

2.1e+01 1.5e+01 1.4e+01 9.7e+00 1.2e+01 1.7e+01 2.6e+01

3.4e+01 2.5e+01 2.3e+01 1.5e+01 1.6e+01 1.9e+01 2.6e+01 5.0e+01 1.3e+01

5.7e+01 3.6e+01 3.7e+01 2.9e+01 3.0e+01 3.4e+01 4.7e+01 9.5e+01 1.8e+02

9.1e+01 6.5e+01 5.6e+01 4.4e+01 4.0e+01 5.1e+01 6.4e+01 1.4e+02 2.5e+02 4.2e+02

1.5e+02 1.1e+02 1.0e+02 6.4e+01 7.1e+01 9.0e+01 2.0e+02 3.7e+02 5.7e+02 5.8e+02

2.1e+02 2.1e+02 1.5e+02 1.1e+02 1.1e+02 1.2e+02 1.3e+02 2.3e+02 4.5e+02 6.0e+02 6.2e+02 9.0e+02

3.8e+02 3.4e+02 2.8e+02 2.1e+02 2.2e+02 1.8e+02 2.0e+02 3.4e+02 6.7e+02 1.0e+03 1.9e+03 2.1e+03 7.3e+02

4.5e+02 4.8e+02 4.4e+02 3.0e+02 2.9e+02 2.8e+02 2.9e+02 4.2e+02 6.9e+02 7.9e+02 1.9e+03 1.3e+03 1.7e+03

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

1 75 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1−10

1

10

210

8.0e-02 5.7e-02 4.5e-02 3.9e-02

2.3e-01 1.5e-01 1.2e-01 9.2e-02 8.1e-02 8.9e-02

6.4e-01 4.1e-01 3.5e-01 2.5e-01 2.4e-01 3.2e-01 3.9e-01

1.6e+00 9.8e-01 9.1e-01 6.5e-01 7.7e-01 1.1e+00 1.7e+00

2.7e+00 1.8e+00 1.6e+00 1.1e+00 1.2e+00 1.4e+00 2.0e+00 3.8e+00 1.1e+00

5.5e+00 3.2e+00 3.2e+00 2.5e+00 2.6e+00 3.0e+00 4.2e+00 9.2e+00 1.6e+01

1.0e+01 6.7e+00 6.0e+00 4.4e+00 4.3e+00 5.2e+00 7.5e+00 1.6e+01 2.8e+01 4.3e+01

2.0e+01 1.3e+01 1.3e+01 8.7e+00 9.6e+00 1.2e+01 2.6e+01 5.1e+01 8.5e+01 1.1e+02

3.8e+01 3.2e+01 2.4e+01 1.7e+01 1.6e+01 1.9e+01 2.0e+01 3.8e+01 7.8e+01 1.1e+02 1.3e+02 2.3e+02

6.2e+01 5.6e+01 4.7e+01 3.7e+01 3.6e+01 3.2e+01 3.8e+01 6.3e+01 1.1e+02 2.6e+02 3.9e+02 3.7e+02 2.8e+02

8.1e+01 7.9e+01 6.9e+01 5.8e+01 5.3e+01 5.1e+01 5.0e+01 8.5e+01 1.3e+02 1.9e+02 5.6e+02 6.3e+02 6.0e+02

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

2 75 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1

10

210

310

1.1e+00 7.7e-01 6.1e-01 5.6e-01

3.0e+00 2.0e+00 1.6e+00 1.2e+00 1.1e+00 1.2e+00

7.4e+00 4.8e+00 4.2e+00 3.1e+00 2.8e+00 3.7e+00 4.9e+00

1.5e+01 9.9e+00 9.2e+00 6.7e+00 8.1e+00 1.2e+01 1.8e+01

2.5e+01 1.7e+01 1.5e+01 1.0e+01 1.1e+01 1.4e+01 1.9e+01 3.7e+01 1.0e+01

4.2e+01 2.5e+01 2.5e+01 2.0e+01 2.0e+01 2.4e+01 3.4e+01 7.4e+01 1.4e+02

6.7e+01 4.3e+01 3.8e+01 3.0e+01 2.8e+01 3.3e+01 4.7e+01 1.1e+02 1.8e+02 3.3e+02

1.1e+02 7.4e+01 6.9e+01 4.7e+01 5.2e+01 6.6e+01 1.5e+02 2.8e+02 4.3e+02 5.0e+02

1.6e+02 1.5e+02 1.1e+02 8.1e+01 7.9e+01 9.2e+01 9.7e+01 1.8e+02 3.6e+02 4.7e+02 4.5e+02 8.0e+02

2.8e+02 2.3e+02 1.9e+02 1.6e+02 1.7e+02 1.3e+02 1.5e+02 2.6e+02 5.2e+02 7.9e+02 1.4e+03 1.2e+03 6.5e+02

2.9e+02 3.1e+02 2.8e+02 2.3e+02 2.3e+02 2.1e+02 2.1e+02 3.4e+02 5.1e+02 6.3e+02 1.7e+03 2.1e+03 1.3e+03

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

SRbcD SRbc@ SRjcD SRjc@

25

SIGNIFICANCEINSR95 WINDOWS

SRbcD SRbc@ SRjcD SRjc@

1 95 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1−10

1

10

210

1.1e-01 7.6e-02 5.9e-02 5.1e-02

3.0e-01 2.0e-01 1.6e-01 1.2e-01 1.1e-01 1.2e-01

8.3e-01 5.5e-01 4.7e-01 3.3e-01 3.2e-01 4.2e-01 5.1e-01

2.0e+00 1.3e+00 1.3e+00 8.7e-01 1.0e+00 1.5e+00 2.3e+00

3.5e+00 2.5e+00 2.2e+00 1.5e+00 1.6e+00 1.9e+00 2.6e+00 4.9e+00 1.4e+00

6.9e+00 4.3e+00 4.4e+00 3.3e+00 3.5e+00 3.9e+00 5.4e+00 1.1e+01 1.9e+01

1.3e+01 9.2e+00 8.3e+00 5.8e+00 5.7e+00 6.9e+00 1.0e+01 2.0e+01 3.8e+01 5.0e+01

2.4e+01 1.8e+01 1.7e+01 1.1e+01 1.2e+01 1.5e+01 3.3e+01 6.5e+01 1.1e+02 1.2e+02

4.8e+01 3.9e+01 3.2e+01 2.2e+01 2.0e+01 2.3e+01 2.5e+01 4.8e+01 9.7e+01 1.3e+02 1.7e+02 2.6e+02

7.7e+01 7.3e+01 6.6e+01 4.3e+01 4.5e+01 4.1e+01 4.8e+01 7.8e+01 1.6e+02 3.2e+02 5.1e+02 6.3e+02 3.3e+02

1.1e+02 1.1e+02 9.9e+01 7.5e+01 6.2e+01 6.2e+01 6.4e+01 9.6e+01 1.8e+02 2.3e+02 6.5e+02 3.7e+02 8.1e+02

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

2 95 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1

10

210

310

1.6e+00 1.1e+00 8.6e-01 8.1e-01

4.1e+00 2.9e+00 2.3e+00 1.7e+00 1.6e+00 1.7e+00

1.0e+01 7.0e+00 6.0e+00 4.3e+00 3.9e+00 5.1e+00 6.7e+00

2.0e+01 1.4e+01 1.3e+01 9.3e+00 1.1e+01 1.6e+01 2.4e+01

3.3e+01 2.4e+01 2.2e+01 1.4e+01 1.5e+01 1.8e+01 2.4e+01 4.8e+01 1.3e+01

5.5e+01 3.4e+01 3.6e+01 2.8e+01 2.9e+01 3.1e+01 4.4e+01 9.1e+01 1.7e+02

8.7e+01 6.2e+01 5.4e+01 4.2e+01 3.8e+01 5.0e+01 6.4e+01 1.4e+02 2.5e+02 4.0e+02

1.4e+02 1.0e+02 9.6e+01 6.1e+01 6.8e+01 8.6e+01 2.0e+02 3.6e+02 5.4e+02 5.5e+02

2.1e+02 2.0e+02 1.5e+02 1.1e+02 1.0e+02 1.1e+02 1.3e+02 2.3e+02 4.5e+02 5.6e+02 6.3e+02 9.1e+02

3.9e+02 3.3e+02 2.8e+02 1.9e+02 2.1e+02 1.7e+02 2.0e+02 3.2e+02 6.4e+02 9.4e+02 1.9e+03 2.1e+03 7.5e+02

4.3e+02 4.4e+02 4.2e+02 3.0e+02 2.8e+02 2.7e+02 2.8e+02 3.9e+02 6.9e+02 7.7e+02 1.9e+03 1.1e+03 1.7e+03

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

1 75 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1−10

1

10

210

7.6e-02 5.4e-02 4.3e-02 3.7e-02

2.2e-01 1.4e-01 1.2e-01 8.7e-02 7.7e-02 8.3e-02

6.1e-01 3.9e-01 3.3e-01 2.4e-01 2.3e-01 3.1e-01 3.7e-01

1.5e+00 9.4e-01 8.8e-01 6.3e-01 7.4e-01 1.1e+00 1.7e+00

2.6e+00 1.7e+00 1.5e+00 1.1e+00 1.1e+00 1.4e+00 1.9e+00 3.7e+00 1.1e+00

5.2e+00 3.1e+00 3.1e+00 2.4e+00 2.5e+00 2.9e+00 4.0e+00 8.9e+00 1.5e+01

9.9e+00 6.5e+00 5.8e+00 4.3e+00 4.1e+00 5.0e+00 7.5e+00 1.6e+01 2.8e+01 4.1e+01

1.9e+01 1.3e+01 1.2e+01 8.3e+00 9.3e+00 1.1e+01 2.5e+01 5.0e+01 8.1e+01 1.0e+02

3.7e+01 2.9e+01 2.4e+01 1.6e+01 1.5e+01 1.8e+01 1.9e+01 3.7e+01 7.0e+01 1.1e+02 1.3e+02 2.1e+02

6.3e+01 5.3e+01 4.7e+01 3.5e+01 3.5e+01 3.1e+01 3.8e+01 6.0e+01 1.1e+02 2.5e+02 3.9e+02 3.7e+02 2.9e+02

7.8e+01 7.6e+01 6.7e+01 5.8e+01 5.0e+01 5.0e+01 4.9e+01 7.9e+01 1.1e+02 1.7e+02 5.6e+02 4.5e+02 6.1e+02

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

2 75 w

indo

w in

SR

W’

Sign

ifica

nce

of m

1

10

210

310

1.1e+00 7.3e-01 5.8e-01 5.3e-01

2.9e+00 1.9e+00 1.5e+00 1.1e+00 1.1e+00 1.1e+00

7.0e+00 4.6e+00 4.0e+00 2.9e+00 2.7e+00 3.5e+00 4.7e+00

1.4e+01 9.4e+00 8.7e+00 6.4e+00 7.7e+00 1.1e+01 1.7e+01

2.4e+01 1.6e+01 1.4e+01 9.7e+00 1.1e+01 1.3e+01 1.8e+01 3.5e+01 9.5e+00

4.0e+01 2.4e+01 2.4e+01 1.9e+01 1.9e+01 2.3e+01 3.1e+01 7.1e+01 1.3e+02

6.4e+01 4.2e+01 3.7e+01 2.9e+01 2.7e+01 3.3e+01 4.7e+01 1.1e+02 1.8e+02 3.2e+02

1.1e+02 7.1e+01 6.6e+01 4.5e+01 5.0e+01 6.3e+01 1.5e+02 2.7e+02 4.0e+02 4.9e+02

1.5e+02 1.5e+02 1.1e+02 7.8e+01 7.6e+01 8.6e+01 9.5e+01 1.8e+02 3.5e+02 4.5e+02 4.7e+02 7.6e+02

2.9e+02 2.2e+02 1.9e+02 1.5e+02 1.6e+02 1.2e+02 1.5e+02 2.4e+02 4.9e+02 7.4e+02 1.4e+03 1.2e+03 6.7e+02

2.9e+02 2.9e+02 2.8e+02 2.3e+02 2.2e+02 2.1e+02 2.0e+02 3.2e+02 5.2e+02 5.7e+02 1.7e+03 1.4e+03 1.4e+03

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

26

SIGNALSIGNIFICANCE

Calculatingsignificancein𝑚f and𝑚fg windows• Oncethesignificanceiscalculatedforeachsignalregionineachwindow,thepercentdifference

betweenthesignificanceoftheSRbc andsignificanceoftheSRjc iscalculatedineachwindowforthesakeofcomparison

27

PERCENTDIFFERENCEINSR95 WINDOWS

win

dow

, b-ta

g =

1W

’Pe

rcen

t diff

eren

ce in

sig

nific

ance

at m

50−

40−

30−

20−

10−

0

10

20

30

40

29.9 29.2 28.4 28.2

25.4 30.4 30.1 28.3 28.1 28.5

26.7 30.3 29.9 28.5 28.2 27.8 28.4

26.6 30.5 30.8 28.3 27.2 26.5 26.7

25.2 30.0 30.8 28.7 28.6 27.0 25.9 24.6 23.8

23.5 29.2 30.2 28.4 28.4 27.0 25.2 22.7 21.5

24.4 30.5 29.6 26.9 27.4 27.4 25.0 22.4 26.8 18.3

18.1 28.1 28.4 26.3 24.7 25.5 23.7 24.8 24.1 14.8

23.8 24.5 24.6 25.7 23.6 22.1 22.2 23.2 19.5 16.7 21.4 9.0

18.2 28.2 29.3 19.1 23.2 25.7 22.4 22.7 35.6 26.1 22.9 41.9 12.0

28.9 29.6 33.1 22.7 18.5 19.9 24.2 17.9 28.8 21.2 14.2 -50.3 25.3

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

win

dow

, b-ta

g =

2W

’Pe

rcen

t diff

eren

ce in

sig

nific

ance

at m

60−

40−

20−

0

20

40

34.9 35.1 33.2 34.5

29.5 35.2 34.3 32.5 32.9 33.5

31.0 34.6 33.9 32.3 31.8 30.6 31.1

28.6 33.9 34.5 31.2 30.5 28.8 29.5

27.5 33.3 34.5 33.1 31.7 30.0 27.7 26.0 24.7

26.0 31.0 32.2 30.9 31.6 29.2 27.8 22.5 22.8

26.5 32.9 31.7 30.6 29.9 34.5 26.0 23.4 27.3 22.1

21.9 30.6 31.6 27.0 26.8 26.9 24.8 25.2 24.5 15.1

26.0 27.1 26.7 26.2 26.4 25.1 24.7 24.1 20.5 20.8 26.9 11.7

25.1 32.0 30.7 22.5 25.0 27.3 23.4 23.4 22.5 22.6 27.2 43.5 11.1

34.8 34.9 35.2 24.4 19.1 23.3 27.2 19.3 27.0 21.1 9.0 -63.0 21.0

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

28

PERCENTDIFFERENCEINSR75 WINDOWS

win

dow

, b-ta

g =

2W

’Pe

rcen

t diff

eren

ce in

sig

nific

ance

at m

20−

10−

0

10

20

30

40

34.6 34.7 32.8 33.9

29.4 34.8 33.7 32.2 32.6 33.0

30.6 34.2 33.7 32.2 31.7 30.4 30.7

28.1 33.5 35.2 31.3 30.4 28.6 28.6

27.8 33.3 34.8 32.8 31.5 29.7 27.9 28.0 24.3

26.2 31.0 32.2 31.0 32.2 28.4 28.0 22.3 21.8

26.8 32.3 31.8 30.1 29.4 34.2 26.0 22.9 27.3 21.6

22.3 31.3 31.4 27.1 26.7 27.4 24.5 24.7 25.2 11.8

25.7 27.6 27.4 27.5 26.1 24.6 24.6 23.5 21.2 19.4 25.5 16.8

25.1 31.6 30.4 21.3 23.5 27.0 21.9 23.7 23.1 21.0 27.2 43.4 10.4

33.9 33.0 34.3 25.0 20.2 23.2 26.2 18.6 24.3 25.8 8.9 -25.4 21.2

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

win

dow

, b-ta

g =

1W

’Pe

rcen

t diff

eren

ce in

sig

nific

ance

at m

20−

10−

0

10

20

30

40

29.6 29.0 27.8 27.8

25.3 29.7 29.6 27.9 27.8 28.0

26.2 30.0 29.8 28.0 27.9 27.7 28.2

25.9 30.1 30.7 28.1 27.2 26.3 26.6

25.4 29.8 30.7 28.7 28.4 26.7 26.0 24.5 23.6

23.7 28.7 30.2 28.5 28.6 26.5 24.9 22.4 20.6

24.7 29.9 29.7 26.5 26.9 27.3 25.1 22.0 26.8 17.3

18.8 28.7 28.2 26.3 24.7 25.7 22.9 24.2 24.6 10.0

23.4 26.3 25.5 26.9 23.5 21.8 22.0 22.6 27.7 15.2 19.3 18.3

18.2 27.9 28.4 18.2 21.7 25.7 20.7 23.0 35.5 23.6 22.9 41.8 12.1

28.5 28.0 32.1 23.5 19.4 20.0 23.1 17.4 39.7 24.2 14.1 -22.1 25.3

[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900

[GeV

]W

’m

1000

1200

1500

1800

2000

2300

2600

3000

3400

3800

4000

29

CONCLUSION

• TwosignalregionswithdifferentHiggsmasswindowscomparedwiththeaimofoptimizingsearchesfor𝑊 → 𝑋ℎ → 𝑞𝑞'(𝑏𝑏' decaysinthemergedchannel

• SignificanceofSRbc andSRjc judgedbyexaminingsignaltobackgroundratiosin𝑋 and𝑊′masswindowstailoredtoeachsignalsampleandsignalregion

• Inallsamplesbutthe𝑚f = 800GeV,𝑚fg = 4000GeV,theSRjc haslessersignificance,withatypicalpercentdifferenceofapproximately20%to30%

• ConcludethatthetighterHiggsmasswindowismoreoptimal

30

ADDITIONALDISTRIBUTIONS

31

32

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1

10

210

310

410

510

610

710



= 13 TeVs175HSB

ηh leading track jet 2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Dat

a/Bk

g

0.40.60.8

11.21.41.6

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1−10

1

10

210

310

410

510

610



= 13 TeVs275HSB


Dat

a/Bk

g

0.40.60.8

11.21.41.6

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1

10

210

310

410

510

610

710



= 13 TeVs195HSB


Dat

a/Bk

g

0.40.60.8

11.21.41.6

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1−10

1

10

210

310

410

510

610



= 13 TeVs295HSB


Dat

a/Bk

g

0.40.60.8

11.21.41.6

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1

10

210

310

410

510

610



= 13 TeVs175HSB

ηh sub-leading track jet 2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Dat

a/Bk

g

0.40.60.8

11.21.41.6

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1−10

1

10

210

310

410

510

610



= 13 TeVs275HSB


Dat

a/Bk

g

0.40.60.8

11.21.41.6

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1

10

210

310

410

510

610



= 13 TeVs195HSB


Dat

a/Bk

g

0.40.60.8

11.21.41.6

2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5

Eve

nts

/ 0.2

1−10

1

10

210

310

410

510

610



= 13 TeVs295HSB


Dat

a/Bk

g

0.40.60.8

11.21.41.6

33

0 1 2 3 4 5 6 7 8 9 10

Eve

nts

/ 0.4

1−101

10

210

310

410

510

610

710

810

910



= 13 TeVs175HSB

X D20 1 2 3 4 5 6 7 8 9 10

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 1 2 3 4 5 6 7 8 9 10

Eve

nts

/ 0.4

3−10

2−10

1−101

10

210

310

410

510

610

710

810



= 13 TeVs275HSB

X D20 1 2 3 4 5 6 7 8 9 10

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 1 2 3 4 5 6 7 8 9 10

Eve

nts

/ 0.4

1−101

10

210

310

410

510

610

710

810

910



= 13 TeVs195HSB

X D20 1 2 3 4 5 6 7 8 9 10

Dat

a/Bk

g

0.40.60.8

11.21.41.6

0 1 2 3 4 5 6 7 8 9 10

Eve

nts

/ 0.4

3−10

2−10

1−101

10

210

310

410

510

610

710

810



= 13 TeVs295HSB

X D20 1 2 3 4 5 6 7 8 9 10

Dat

a/Bk

g

0.40.60.8

11.21.41.6

150 160 170 180 190 200

Eve

nts

/ 2.5

GeV

10

210

310

410

510

610



= 13 TeVs175HSB

h mass [GeV]150 160 170 180 190 200

Dat

a/Bk

g

0.40.60.8

11.21.41.6

150 160 170 180 190 200

Eve

nts

/ 2.5

GeV

1−10

1

10

210

310

410

510

610



= 13 TeVs275HSB

h mass [GeV]150 160 170 180 190 200

Dat

a/Bk

g

0.40.60.8

11.21.41.6

150 160 170 180 190 200

Eve

nts

/ 2.5

GeV

10

210

310

410

510

610



= 13 TeVs195HSB

h mass [GeV]150 160 170 180 190 200

Dat

a/Bk

g

0.40.60.8

11.21.41.6

150 160 170 180 190 200

Eve

nts

/ 2.5

GeV

1−10

1

10

210

310

410

510

610



= 13 TeVs295HSB

h mass [GeV]150 160 170 180 190 200

Dat

a/Bk

g

0.40.60.8

11.21.41.6

Documents

COMPARING SIGNAL REGIONS TO OPTIMIZE ALL HADRONIC … · CERNAND THE LHC • European Center for Nuclear Research (CERN) • Located near Geneva, Switzerland • Site of the Large