Searches for promptly decaying squarks and gluinoswith ATLAS

J. Maurer, on behalf of the ATLAS Collaboration

SUSY2019 conference, May 20, 2019

ATLAS search program for gluinos / squarks

Signature Published in Luminosity

0` + 2-6jq

qp

p

χ01

q

χ01

q

PRD 97 (2018) 112001 36 fb−1

0` + 7-11jg

g

χ± χ02

χ∓ χ02

p

p

q q′ W±

Z

χ01

q′q W∓Z

χ01

JHEP 12 (2017) 034 36 fb−1

≥ 3bg

g

t

t

p

p

t

χ01

t

t

χ01

t

ATLAS-CONF-2018-041 80 fb−1

1` + jetsq

q

χ±1χ∓1

p

p

q′

χ01

W±

q′

χ01

W∓

PRD 96 (2017) 112010 36 fb−1

SFOS 2`q

q

χ02

χ02

p

p

q

χ01

Z

q

χ01

Z

EPJC 78 (2018) 625 36 fb−1

SS/3`b

b

χ±1

χ∓1

p

p

t

χ01

W

t

χ01

W

NEW! 139 fb−1

γ + jetsg

g

χ01

χ01

p

p

q q

G

γ

qq

G

γ

PRD 97 (2018) 092006 36 fb−1

τ + jetsg

g

χ±1

τ

χ01 τ

p

p

q q ντ

τ

G

qq τ

τ

GPRD 99 (2019) 012009 36 fb−1

+ dedicated searches for b/t production, and g/q decays via RPV couplings

ATLAS strong production searches 2 / 16

Overall experimental sensitivity

1000 1200 1400 1600 1800 2000 2200 2400

) [GeV]g~m(

500

1000

1500

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2500

3000

3500

) [G

eV]

0 1χ∼m

(

0 lep. [1712.02332] 0

1χ∼q q→g~

3 b-jets [CONF-2018-041]≥ 0

1χ∼b b→g~

2 lep. SS [CONF-2018-041, 1706.03731]≥ 3 b-jets + ≥ 0

1χ∼t t→g~

0 lep. + 1 lep. [1712.02332, 1708.08232] 0

1χ∼Wq q→g~

2 lep. SS ≥ 7-11 jets + 1 lep. + ≥ 0

1χ∼WZq q→g~

[1708.02794, 1708.08232, 1706.03731]

3 lep. [1805.11381, 1706.03731]≥2 lep. OS SF + ν∼/l~ via 0

1χ∼)νν(ll/q q→g~

[1808.06358]τ 1 ≥ ν∼/τ∼ via 0

1χ∼)νν/ντ/ττ(q q→g~

[1802.03158]γ 1 ≥ 0

1χ∼ via G

~/Z)γ(q q→g~

ATLAS Preliminary

-1=13 TeV, 36.1 - 79.8 fbs

All limits at 95% CL

September 2018

)0

1χ∼)<m(

g~m(

) [GeV]q~m(

400 600 800 1000 1200 1400 1600 1800 2000

) [G

eV]

0 1χ∼m

(

500

1000

1500

2000

25000 lep. + mono-jet [1712.02332, 1711.03301] 0

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0 lep. + 1 lep. [1712.02332, 1708.08232] 0

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Lq~

[1802.03158]γ 2 ≥ 0

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~/Z)γ q(→ t~, b

~, q~

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Lq~

2 lep.≥ ν∼/l~ via 0

1χ∼)νν/ν q(ll/l→

Lq~

τ 1 ≥ ν∼/τ∼ via 0

1χ∼)νν/ντ/ττ q(→

Lq~

ATLAS Preliminary

-1=8-13 TeV, 20.3-36.1 fbs

All limits at 95% CL

c~, s~, d~

, u~ = q~

March 2018

8 TeV,[1507.05525]

)0

1χ∼)<m(

q~m(

Building block for searches: reconstructed jets + leptons + photons + EmissT , with good

resolution + rejection of misclassified objects + resilience to pile-up

ATLAS strong production searches 3 / 16

Missing transverse momentum

0 5 10 15 20 25 30 35 40

⟩µ⟨Average number of interactions

12

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RM

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PreliminaryATLAS-1 = 13 TeV 36 fbs

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10 210 310 [GeV]

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tion ATLAS Simulation Preliminary

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=0.0η|=2.0η|

Electrons=0.0η|=2.0η|

γN.C. =0.0η|=2.0η|

τHadr. 1p0n3pXn

Good resolution, but non-gaussian tails.

SUSY searches: when dominant bkg for thesignature has no genuine Emiss

T (0`, γ, 2`):adding min ∆φ(Emiss

T , j) requirement

1

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nts

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Standard Model (SM)

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Flavour Symmetric

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CONF-2018-023, CONF-2018-038,CONF-2018-041, EPJC 78 (2018) 625

ATLAS strong production searches 4 / 16

Electrons, muons

10 20 30 40 50 60 70 80

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| < 2.47ηMedium LH ID, |

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ATLAS Preliminary-1 = 13 TeV, 43.8 fbs

<2.47η-2.47<

Data: full, MC: open

Loose Medium Tight

[GeV]TE

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EGAM-2018-006, EGAM-2018-002,EPJC 76 (2016) 292

ATLAS strong production searches 5 / 16

Taus, photons

[GeV] had-visτT

truth p

50 100 150 200 250 300 350 400 450 500

effic

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0

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Reco+Tight Tight truth 3-prong = 13 TeVs

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SimulationPreliminaryATLAS

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IDε Dataγll→Z MCγll→Z

γUnconverted

FixedCutLoose isolation

< 40 GeVT20 GeV < E < 2.37η < 1.37, 1.52 < η

ATLAS Preliminary-1=13 TeV, 44 fbs

10 20 30 40 50 60 70µ

0.90.95

11.05

1.1

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ε/D

ata

ε

SUSY searches:

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nts

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eV

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410DataTop Quarks

ντ →W νν →Z ττ →Z

VVOther

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GMSB

ATLAS ­1 = 13 TeV, 36.1 fbs

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[GeV]2τT

+m1τTm

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Data

/SM

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GeV

2−10

1−10

1

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610 γγ γ→jetγ→e γγW

γγZ SM TotalData

= 1500 1 χ∼ = 1900, mg~m = 17000

1 χ∼ = 1900, mg~m

= 1000 1 χ∼ = 1000, m0

2 χ∼, ±

1 χ∼m

= 8000 1 χ∼ = 1000, m0

2 χ∼, ±

1 χ∼m

ATLAS-1 = 13 TeV, 36.1 fbs

pre-selectionγγ

[GeV]TH0 1000 2000 3000 4000 5000 6000 7000

Dat

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CONF-2017-029, PUB-2015-045, PRD 96 (2017) 112010, PRD 97 (2018) 092006

ATLAS strong production searches 6 / 16

Jets: energy scale / resolution

[GeV]jet

Tp

20 30 210 210×2 310 310×2

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CR

/ da

taR

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1

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in situPFlow+JES dijet

PFlow+JES total uncertainty

= 0.4R tkanti-| < 0.7η |≤0.2

ATLAS Preliminary-1 = 13 TeV, 43.6 fbs

JETM-2018-006, JETM-2018-006,CONF-2018-041, JHEP 12 (2017) 034

SUSY searches: impact on EmissT resolution,

low-pT jets, calibration of reclustered jets. . .

Eve

nts

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GeV

1−10

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ATLAS

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Single top

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Diboson

Others

)=(905,705,505) GeV1

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±χ∼,q~m(

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ATLAS Preliminary-1 = 13 TeV, 79.8 fbs

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) = 1900, 1 (x50)1

0χ∼), m(g~Gtt: m(

) = 1800, 1000 (x50)1

0χ∼), m(g~Gtb: m(

0 50 100 150 200 250 300 350 400 450 500 [GeV]Σ

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With reweightingWithout reweighting

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Num

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of E

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610 1− = 13 TeV, 36.1 fbsSR-11j50-0b

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]1/2 [GeVTH / missTE

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ATLAS strong production searches 7 / 16

Jets: flavour tagging, pile-up mitigation

Run 2 ≈ 1 interaction per mm

[GeV]T

track p1 10 210

) [m

m]

0(zσ

0.1

0.2

0.3

0.4

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Data 2018

ATLAS = 13 TeVs

Preliminary

[GeV]T

track p1 10 210D

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0.951

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SUSY searches: thanks to flavour taggingand pile-up mitigation discriminants,challenging signatures with largemultiplicities can be looked into:

1

10

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510

610

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nts

ATLAS Preliminary-1 = 13 TeV, 79.8 fbs

0L Preselection

DataTotal backgroundtt

Single top + Xtt

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) = 1900, 1 (x50)1

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3 4 5 6Number of b-jets

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ber

of E

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in

0

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1− = 13 TeV, 36.1 fbsCRW-7j50

ATLAS Data

Total background ql, ll→ tt

+ jetsν l→W Other

pMSSM benchmark

2-step benchmark

Number of Jets6 7 8 9 10 11 12 13 14

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CONF-2018-045, IDTR-2018-008,CONF-2018-041, JHEP 12 (2017) 034

ATLAS strong production searches 8 / 16

SS/3L + jets [ATLAS-CONF-2019-015]

First look at the full Run 2 dataset (139 fb−1) with this signature

Relies on ‘basic’ objects: isolated leptons, (b-tagged) jets, EmissT

benefits from the work done in the performance groups

Data acquisition: dilepton triggers + EmissT trigger (for Emiss

T > 250 GeV)

Five complementary signal regions for a coarse scan of the phase space:

SR n` nb nj met [GeV] meff [GeV] EmissT /meff SUSY

Rpv2L ≥ 2 (`±`±) ≥ 0 ≥ 6 (pT > 40 GeV) − > 2600 − g → ttχ01, χ

01 → 3q (λ′′ 6= 0)

g → qqχ01, χ

01 → qq′` (λ′ 6= 0)

g → tt∗1 , t∗1 → qq′ (λ′′ 6= 0)

Rpc2L1b ≥ 2 (`±`±) ≥ 1 ≥ 6 (pT > 40 GeV) − − > 0.25 b1 → tW χ01

Rpc2L2b ≥ 2 (`±`±) ≥ 2 ≥6 (pT > 25 GeV) > 300 > 1400 > 0.14 b1 → tW χ01

g → ttχ01

Rpc2L0b ≥ 2 (`±`±) = 0 ≥ 6 (pT > 40 GeV) > 200 > 1000 > 0.2 g → qq′WZ χ01

Rpc3LSS1b ≥ 3 (`±`±`±) ≥ 1 no cut but veto 81 < me±e± < 101 GeV > 0.14 t1 → tW±(W ∗)χ01

g

g

t

t

p

p

t

λ′′313b

d

t

b

d

b

b

χ±1

χ∓1

p

p

t

χ01

W

t

χ01

W

∗

g

g

χ±1

χ02

χ±1 χ0

2

p

p

q q W

Z

χ01

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Z

χ01

t1

t1

χ02χ±1

χ02 χ±

1

p

p

t W

W ∗

χ01

t W∓W ∗

χ01

∗

ATLAS strong production searches 9 / 16

SS/3L: prompt same-sign lepton backgrounds

WZ+jets in regions with no b-jet, ttV in regions with b-jet(s)

+ various processes with multiple t/W /Z/H: summed contribution important!

Estimated with MC simulations normalized to σ(theory)

b

b

b

b

bATLAS,√

s = 13 TeV, 3.2 fb–1b

PowhegBox+Py8Sherpa v2.2PowhegBox+HerwigMC@NLO+Herwig

1

10 1

W±Z → ℓνℓℓ fid. cross section as a function of the jet multiplicity

σfid.[fb

]

0 1 2 3 ≥ 40

0.20.40.60.8

11.21.41.6

Njets

MC

/Dat

a

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itrar

y U

nits

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0.25 Simulation PreliminaryATLAS

= 13 TeVs

nominal

0µ = 2.0 µ

0µ = 0.5 µ

[GeV] eff M0 500 1000 1500 2000 2500 3000

Rat

io0.5

1

1.5

PUB-2017-005, PUB-2016-005

Uncertainties: QCD scales, matching, parton shower. . . up to 20% of total SM yield

Validation regions for WZ + 4/5 jets, and ttV

(future) challenge: how to address unknown correlations of theory uncertainties?

ATLAS strong production searches 10 / 16

SS/3L: reducible backgrounds

Fake / non-prompt leptons: estimated withmatrix method based on isolation + impactparameter + electron identification

Cha

rge

mis

iden

tific

atio

n pr

obab

ility

3−10

2−10

1−10εData misidentification probability

Tight + Fix (Tight) Medium + Fix (Tight) Medium + Fix (Tight) + BDT

ATLAS-1 = 13 TeV, 33.9 fbs

[GeV]TE

50 100 150 200 250

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Charge-flip electrons rejected with dedicateddiscriminant based on track properties,residual contribution estimated by weightingOS data by the flip rate

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ZttWW, ZZ, VH, VVV

WttVV, 3t, 4ttH, ttt(W)Z, t

Charge-flip

ATLAS Preliminary-1=13 TeV, 139 fbs

> 50 GeVmiss

T2j, E≥, ±l±l

2 3 4 5 > 25 GeV)

TNumber of jets (p

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WttVV, 3t, 4ttH, ttt(W)Z, t

Charge-flip

ATLAS Preliminary-1=13 TeV, 139 fbs

> 50 GeVmiss

T2j, E≥, ±l±l

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left figures from arXiv:1902.04655ATLAS strong production searches 11 / 16

SS/3L: results

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Charge-flip

Total uncertaintyWZ

WttWW, ZZ, VH, VVV

ATLAS Preliminary-1=13 TeV, 139 fbs

> 50 GeVmiss

T3j, E≥

ee, 0b ee, 1b 2b≥ee, , 0bµe , 1bµe 2b≥, µe , 0bµµ , 1bµµ 2b≥, µµ 3l, 0b≥ 3l, 1b≥ 2b≥3l, ≥

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Wtt WZ WW, ZZ, VH, VVV

ATLAS Preliminary-1 = 13 TeV, 139 fbs

VRttV VRWZ4j VRWZ5j Rpc2L0b Rpc2L1b Rpc2L2b Rpc3LSS1b Rpv2L

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ATLAS strong production searches 12 / 16

SS/3L: exclusion limits for simplified models (1)

1000 1200 1400 1600 1800 2000 2200) [GeV]g~m(

500

1000

1500

2000

2500

) [G

eV]

10 χ∼m

(

)expσ1 ±Expected Limit (

)SUSYtheoryσ1 ±Observed Limit (

[arXiv:1706.03731]

-1SS/3L obs. 36 fb

) < m(Z)0

1χ∼,0

2χ∼ m(

∆

) < m(W ), 0

2χ∼,±1χ∼

m(∆

)0

1χ∼) < m(

g~m(

))/21

0χ∼) + m(

1

±χ∼) = (m(2

0χ∼))/2, m(

1

0χ∼) + m(g~) = (m(

1

±χ∼; m(1

0χ∼ qqWZ→ g~ production, g~ g~

All limits at 95% CL

-1=13 TeV, 139 fbs

Preliminary ATLAS

g

g

χ±1

χ02

χ±1 χ0

2

p

p

q q W

Z

χ01

qq W

Z

χ01

ATLAS strong production searches 13 / 16

SS/3L: exclusion limits for simplified models (2)

Versatile signature, also limits on thirdgeneration squarks, RPV scenarios. . .

600 800 1000 1200 1400 1600 1800 2000 2200) [GeV]g~m(

400

600

800

1000

1200

1400

1600

1800

2000

) [G

eV]

t~m

(

)expσ1 ±Expected Limit (

)SUSYtheoryσ1 ±Observed Limit (

[arXiv:1706.03731]

-1SS/3L obs. 36 fb

) + m

(t)

t~

) < m

(

g~m(

d b → t~

, t t~

→ g~ production, g~ g~

All limits at 95% CL

-1=13 TeV, 139 fbs

Preliminary ATLAS

g

g

t

t

p

p

t

λ′′313b

d

t

b

d

600 650 700 750 800 850 900 950 1000 1050 1100) [GeV]b

~m(

200

400

600

800

1000) [G

eV]

10 χ∼m

(

)expσ1 ±Expected Limit (

)SUSYtheoryσ1 ±Observed Limit (

[arXiv:1706.03731]

-1SS/3L obs. 36 fb

) + 100 GeV

1

0χ∼

) < m(t) + m(

b~m(

) + 100 GeV1

0χ∼) = m(

1

±χ∼, m(1

±χ∼ t→1b~

production, 1b~

1b~

All limits at 95% CL

-1=13 TeV, 139 fbs

Preliminary ATLAS

b

b

χ±1

χ∓1

p

p

t

χ01

W

t

χ01

W

∗

550 600 650 700 750 800 850 900 950) [GeV]t

~m(

3−10

2−10

1−10

1 [pb]

* B

Rσ

)1

0χ∼ m(≈)

1

±χ∼)+100 GeV ; m(1

0χ∼)=m(

2

0χ∼)-275 GeV ; m(1t

~) = m(

1

0χ∼; m(

1

0χ∼ W*→

1

±χ∼, 1

±χ∼± tW→ 1t~

production, 1t~

1t~

All limits at 95% CL

-1=13 TeV, 139 fbs

Preliminary ATLAS t~ t

~→pp

Theoretical uncertainty

Expected limit

Observed limit

σ 1±Expected

σ 2±Expected

[arXiv:1706.03731]

-1SS/3L obs. 36 fb

t1

t1

χ02χ±1

χ02 χ±

1

p

p

t W

W ∗

χ01

t W∓W ∗

χ01

∗

ATLAS strong production searches 14 / 16

Conclusion

First results for inclusive squark / gluino searches with the full Run 2 dataset

Same-sign / three leptons + jets: probing various types of (long) decay chains forgluinos and squarks

Again found no deviation from Standard Model!

More advanced techniques to be deployed in next results: stay tuned!

All ATLAS Supersymmetry Public Results

ATLAS strong production searches 15 / 16

Other highlights from ATLAS SUSY searches

General overview [G. Stark, Monday]

Third-generation squarks [J. Anders, Monday]

Compressed mass spectra [S. Sekmen, Thursday]

Public likelihood for reinterpretations [G. Stark, Thursday]

Charginos/neutralinos [D. Miller, Tuesday]

Sleptons [S. Carra, Tuesday]

R-parity violation [J. Berlingen, Thursday]

Long-lived partices [H. Otono, Thursday]

Reconstruction techniques [C. Clement, Wednesday]

Prospects with HL-LHC [A. Cervelli, Wednesday]

ATLAS strong production searches 16 / 16

Backup

SS/3L: sources of uncertainties

Rpc2L0b Rpc2L1b Rpc2L2b Rpc3LSS1b Rpv2L0

0.1

0.2

0.3

0.4

0.5

0.6

Rel

ativ

e un

cert

aint

y

ATLAS Preliminary-1 = 13 TeV, 139 fbs

Total unc. Theoretical unc.MC statistical unc. Fakes/non-prompt, Charge-flip statistical unc.Experimental unc. Fakes/non-prompt, Charge-flip systematic unc.

ATLAS strong production searches 1 / 1