Arnowitt Symposium and Mitchell Workshop on Collider and...

Arnowitt Symposium and Mitchell Workshop onCollider and Dark Matter Physics

DM Searches at CMS Using LHC-data Collected at√s = 8 TeV

Andres Florez - Uniandes (COL)

May 20, 2015

Andres Florez (Uniandes - Colombia) Texas A&M Symposium May 20, 2015 1 / 59

Outline

1 Motivation

2 Latest Color Searches (CMS-SUS-13019, CMS-SUS-14001)

3 Electroweak SUSY SearchesSearches with a h→ γγ Decay - (CMS-SUS-14002)Probing SUSY with VBF (CMS-SUS-14005)

4 DM Exotic Searches (CMS-EXOT-14004)

5 Summary


http://arxiv.org/abs/1409.3168

http://cds.cern.ch/record/2002647

http://cds.cern.ch/record/2002861/files/EXO-14-004-pas.pdf

Motivation

Motivation

• The aim of the talk is to show some of the latest results from CMSrelated to Dark Matter (DM) searches.

• A special focus in SUSY electroweak higgs-tagging searches andVBF SUSY searches is placed due their physics motivation andconnection to DM:

1 SM-Higgs boson discovery.2 Coannihilation and its relation with cosmology (τ).

• For more information on SUSY-color searches please see (Oliver’stalk)

• The latest results from searches in Exotic channels will also bepresented.


https://indico.cern.ch/event/366470/contribution/14

https://indico.cern.ch/event/366470/contribution/14

Motivation

Classic SUSY Searches

• Initial SUSY searches focusedon the color sector.

• These type of signatures havefinal states with:EmissT + jets + leptons(photons)


Motivation

CMS SUSY Color Searches

stop mass [GeV]

100 200 300 400 500 600 700 800

LSP

mas

s [G

eV]

0

100

200

300

400

500

600

700

W

= m

10χ∼

- mt~m

t

= m

10χ∼

- mt~m

ICHEP 2014 = 8 TeVs

CMS Preliminary

1

0χ∼ / c 1

0χ∼ t →t~ production, t~-t

~

-1SUS-13-011 1-lep (MVA) 19.5 fb-1SUS-14-011 0-lep + 1-lep + 2-lep (Razor) 19.3 fb

-1SUS-14-011 0-lep (Razor) + 1-lep (MVA) 19.3 fb

)1

0χ∼ c →t~ ( -1SUS-13-009 (monojet stop) 19.7 fb

-1SUS-13-015 (hadronic stop) 19.4 fb

Observed

Expected

t

= m

10χ∼

- mt~m

gluino mass [GeV]

600 800 1000 1200 1400 1600

LSP

mas

s [G

eV]

0

100

200

300

400

500

600

700

800

900

m(gluino) - m(LSP) =

2 m(to

p)

ICHEP 2014 = 8 TeVs

CMS Preliminary1

0χ∼ t t →g~ production, g~-g~

-1) 19.5 fbT+HTESUS-13-012 0-lep (-1SUS-14-011 0+1+2-lep (razor) 19.3 fb

-1 6) 19.3 fb≥jets

SUS-13-007 1-lep (n-1SUS-13-016 2-lep (OS+b) 19.7 fb-1SUS-13-013 2-lep (SS+b) 19.5 fb

-1SUS-13-008 3-lep (3l+b) 19.5 fb

ObservedSUSYtheoryσObserved -1

Expected


Latest Color Searches (CMS-SUS-13019, CMS-SUS-14001)

Recent Color SUSY Searches - M2T

(CMS-SUS-13019 - JHEP)

Z+jets

W+jets

Top

Multijet

Nj

Nb

32 4

0

3

1

≥

2

65 ≥ 200

450

1200

750

H T [G

eV]

Low HT

Medium HT

High HT

30 !"#$%% &'()*+


http://link.springer.com/article/10.1007/JHEP05%282015%29078




• No excess above SM expectation.

[GeV]T2M200 300 400 500 600 700 800

Eve

nts

/ 1

5 G

eV

1

10

210

310MultijetW+jetsZ+jetsTop quarkOtherData

TLow H

(8 TeV)-119.5 fb

CMS

[GeV]T2M0 100 200 300 400 500 600 700 800

Eve

nts

/ 1

5 G

eV

1

10

210

310

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510


TMedium H

(8 TeV)-119.5 fb

CMS

[GeV]T2M0 100 200 300 400 500 600 700 800

Eve

nts

/ 1

5 G

eV

-110

1

10

210

310

410


THigh H

(8 TeV)-119.5 fb

CMS






[GeV]g~m400 600 800 1000 1200 1400

[GeV

]0 1χ∼

m

200

400

600

800

1000

-310

-210

-110

1

10 (8 TeV)-119.5 fb

CMS

NLO+NLL exclusion1

0χ∼ q q → g~, g~ g~ →pp

theoryσ 1 ±Observed

experimentσ 1 ±Expected

95%

CL

uppe

r lim

it on

cro

ss s

ectio

n [p

b]

[GeV]g~m400 600 800 1000 1200

[GeV

]0 1χ∼

m

0

500

1000

-310

-210

-110

1

10 (8 TeV)-119.5 fb

CMS

NLO+NLL exclusion1

0χ∼ b b → g~, g~ g~ →pp



95%

CL

uppe

r lim

it on

cro

ss s

ectio

n [p

b]

[GeV]g~m400 600 800 1000 1200 1400

[GeV

]0 1χ∼

m

0

200

400

600

800

1000

-310

-210

-110

1

10 (8 TeV)-119.5 fb

CMS

NLO+NLL exclusion1

0χ∼ t t → g~, g~ g~ →pp



95%

CL

uppe

r lim

it on

cro

ss s

ectio

n [p

b]

[GeV]q~m400 600 800 1000 1200

[GeV

]0 1χ∼

m

0

200

400

600

800

-210

-110

1

10 (8 TeV)-119.5 fb

CMS

NLO+NLL exclusion1

0χ∼ q → q~, q~ q~ →pp

)c~, s~, d~

, u~ (R

q~+L

q~

q~one light



95%

CL

uppe

r lim

it on

cro

ss s

ectio

n [p

b]

[GeV]b~m

200 400 600

[GeV

]0 1χ∼

m

0

200

400

600

800

-210

-110

1

10

(8 TeV)-119.5 fb

CMS

NLO+NLL exclusion1

0χ∼ b → b~

, b~

b~

→pp


experimentσ 1, 2 ±Expected

95%

CL

uppe

r lim

it on

cro

ss s

ectio

n [p

b]

[GeV]t~

m200 400 600 800

[GeV

]0 1χ∼

m0

200

400

600

-310

-210

-110

1

10 (8 TeV)-119.5 fb

CMS

NLO+NLL exclusion1

0χ∼ t → t~, t~ t

~ →pp


experimentσ 1, 2 ±Expected

95%

CL

uppe

r lim

it on

cro

ss s

ectio

n [p

b]




Recent Color SUSY Searches3-rd Gen. q in Fully Hadronic Final States

(CMS-SUS-14001 - JHEP, in press)

P2

P1

t

t

t

χ01

χ01

t

P2

P1

b

b

b

χ01

χ01

b

P2

P1

t

t

c

χ01

χ01

c

[GeV]T2M

Eve

nts

/ 50

GeV

0

20

40

60

80

100

120

140

160

180

200

220 Data+Xhadrτ →/Wtt

+Xµ e,→/Wttνν→Z

(500, 100)0χ∼ t→t~

(650, 50)0χ∼ t→t~

CMS

(8 TeV)-119.4 fb

[GeV]T2M100 200 300 400 500 600 700D

ata

Dat

a -

MC

-2-1012

[GeV] CTM0 100 200 300 400 500 600

Eve

nts

/ 50

GeV

-210

-110

1

10

210

310

410

510 Dataνν→Zνl→W

TopDiBosonQCD

(300,150)0χ∼

b→b~

(8 TeV)-119.4 fb

CMS

[GeV]CTM0 100 200 300 400 500 600

MC

Dat

a-M

C

-2-1012

[GeV]1j

Tp

300 400 500 600 700 800 900 1000

Eve

nts

/ 25

GeV

-410

-310

-210

-110

1

10

210

310

410

510

610

710 Dataνν→Zνl→W

tttQCDDiBoson

-l+l→Z (250,240)

0χ∼ c→ t~

(8 TeV)-119.7 fb

CMS

[GeV]1j

Tp

300 400 500 600 700 800 900 1000

MC

Dat

a -

MC

-2-1012


http://arxiv.org/pdf/1503.08037v1.pdf


Recent Color SUSY Searches3-rd Gen. q in Fully Hadronic Final States

(CMS-SUS-14001 - JHEP, in press)

[GeV]t~m

100 200 300 400 500 600 700

[GeV

]10 χ∼

m

0

100

200

300

400

500

600

t

= m

1

0χ∼

- m

t~m

1

0χ∼

= m

t~m

W

= m

1

0χ∼

- m

t~m

(8 TeV)-119.4-19.7 fb

CMS

) = 100% 1

0χ∼ t → t~B(

) = 100% 1

0χ∼ c → t~B(

Combined multijet t-tagged& dijet b-tagged searches

Monojet search

NLO-NLL exclusionthσ 1 ±Observed

expσ 1 ±Expected

[GeV]t~m

100 200 300 400 500 600 700

[GeV

]10 χ∼

m

0

100

200

300

400

500

600

t

= m

1

0χ∼

- m

t~m

1

0χ∼

= m

t~m

W

= m

1

0χ∼

- m

t~m

(8 TeV)-119.4-19.7 fb

CMS

) = 100% 1

0χ∼ c → t~B(

) = 50% 1

0χ∼ t → t~B( = 5 GeV

1

0χ∼ - m1

±χ∼mCombined multijet t-tagged& dijet b-tagged searches

Monojet search


expσ 1 ±Expected

(GeV)b~m

100 200 300 400 500 600 700

(G

eV)

10 χ∼m

0

100

200

300

400

500

600

1

0χ∼

= m

b~m

(8 TeV)-119.4-19.7 fb

CMS

) = 100% 1

0χ∼ b → b~

B(Combined monojet &dijet b-tagged searches


expσ 1 ±Expected




Dark Matter & Cosmology

It is important to directly probe the electroweak SUSY sector


Electroweak SUSY Searches


• Searches in the color sector have not yieldpositive signs of SUSY until now.

• SUSY searches in the electroweak (EWK)sector opens a different avenue to find newphysics:

X Smaller predicted cross sections but lowerlevels of hadronic activity

X Complements the color searches

• The discovery of the Higgs opens up new SUSY searches:X Lightest neutral CP–even Higgs (h) expected to be SM–like, if others

are heavy.X χ±1 and χ0

1 decay to h+LSP (RPC models) or V(W/Z) + χ01 (χ0

1 LSP)X Would provide evidence for SUSY solution to hierarchy problem.




• Several new searches using Higgs Tagging (covered here)

X h→ γγ V several hh, hZ and hW channels covered!X h→ bb V (h→ bb)(Z → `e/µ`e/µ), hh→ bbbb

P1

P2

χ±

1

χ0

2

W±

χ0

1

χ0

1

h

P1

P2

χ0

1

χ0

1

h

G

G

h

P1

P2

χ0

1

χ0

1

Z

G

G

h

• Previously released results (not covered here)

X Final states with ≥ 3 leptons, LS (OS) dileptonsX SUSY interpretations EWK χ±1 & LSP (G ||χ0

1) production with decaysthrough leptons and EWK slepton production.


Electroweak SUSY Searches Searches with a h → γγ Decay - (CMS-SUS-14002)

Searches with a h→ γγ Decay(CMS-SUS-14002 - PRD)

• Search channels:

X γγ + bb : targets hh,X γγ + jj : targets hZ & hW,X γγ + `e/µ`e/µ :targets hh, hZ & hW

• Common γγ selection

X 2 γ′s with |ηγ | < 1.4 (barrel)X EγT > 40 GeV & 25 GeV

• Common background (BG) estimation:1 Fit mγγ distribution in sidebands, excluding tag region, with power law.2 Integrate power-law function in Higgs tag region

(mγγ(120→ 130 GeV )) to normalize continuum BG (SM-non h).3 BG shape in discriminating variable (e.g. Emiss

T ) taken from average ofupper and lower mγγ sidebands.

4 BG from SM-Higgs added to sideband-based continuum BG estimate.





(h→ γγ)(h→ bb)(CMS-SUS-14002 - PRD)

• Event selection criteria:1 Veto isolated e or µ2 = 2 b-tagged jets, pjT > 30 GeV3 ∆R(γ, j) > 0.54 mbb(95→ 155) GeV.

• Discriminating variable: ShT = ph→γγT + ph→bb

T

1 ShT distribution for signal extends to high values

2 BG ShT distribution obtained from mγγ

sidebands, averaged and normalized from mγγ

SF fit (SM-Higgs negligible).3 Observed events consistent with BG prediction

(GeV)γγm100 110 120 130 140 150 160 170

Eve

nts

/ G

eV

0

1

2

3

4

5

6 = 8 TeVs -1CMS L = 19.5 fb

Data

Sideband fit=130 GeV

0

1χ∼

Signal, m

(GeV)hTS

0 50 100 150 200 250 300

Eve

nts

/ 6

0 G

eV

0

1

2

3

4

5 Data

Background estimate=130 GeV

0

1χ∼

Signal, m

=200 GeV0

1χ∼

Signal, m

= 8 TeVs -1CMS L = 19.5 fb





(h→ γγ)(W /Z → jj)(CMS-SUS-14002 - PRD)

• Event selection criteria:1 Veto isolated e or µ2 Veto events w/ 2 b-tagged jets in

mbb(95→ 155) GeV.3 pjT > 30 GeV, ∆R(γ, j) > 0.54 mjj(70→ 110) GeV

• Discriminating variable: EmissT

X Signal spectrum harder for larger NLSP -LSPmass difference.

X BG EmissT distribution obtained from mγγ

(sidebands, averaged and normalized from mγγ SB fit).X Small SM-Higgs BG contribution.X Observed events consistent with BG prediction

(GeV)γγm100 110 120 130 140 150 160 170

Eve

nts

/ G

eV

20

40

60

80

100

120

140

160 = 8 TeVs -1CMS L = 19.5 fb

Data

Sideband fit

=130 GeV0

1χ∼

Signal (x30), m

(GeV)miss

TE

0 20 40 60 80 100 120 140

Eve

nts

/ 1

0 G

eV

-110

1

10

210

310

Data

Background estimate

=130 GeV0

1χ∼Signal, m

=200 GeV0

1χ∼Signal, m

= 8 TeVs -1

CMS L = 19.5 fb

(GeV)miss

TE

0 20 40 60 80 100 120 140Pre

dic

tion

Data

00.5

11.5

2





hh, hZ , hW → γγ + `±eµ(CMS-SUS-14002 - PRD)

• The hh search includes one h to WW, ZZ or ττ• Event selection criteria:

1 ≤ 1 b-tagged jet to avoid overlap with h→ bb.2 ≥ 1µ|| ≥ 1e3 pT (e||µ) > 15 GeV & ∆R(`e||µ, γ) > 0.34 Reject e miss ID’s as γ by vetoing meγ near mZ (86→ 96) GeV.

• Discriminating variable: MT (`lead , EmissT ) =

√2Emiss

T· plead

T(`)(1− cos(∆φ(`, Emiss

T))

Even

ts /

30 G

eV

0

2

4

6

8

10

12

14 = 8 TeVs -1CMS L = 19.5 fb

+ eγγ Data

Non-higgs SM bg

SM higgs

Signal

=130 GeV±1

χ∼hW, m

=130 GeV0

1χ∼

hh, m

=130 GeV0

1χ∼

hZ, m

0 20 40 60 80 100 120 140 160 180

Pred

ictio

nDa

ta

0123456

[GeV]TM

Even

ts /

30 G

eV

0

1

2

3

4

5

6

= 8 TeVs -1CMS L = 19.5 fb

µ + γγ Data

Non-higgs SM bg

SM higgs

Signal

=130 GeV±1

χ∼hW, m

=130 GeV0

1χ∼

hh, m

=130 GeV0

1χ∼

hZ, m

0 20 40 60 80 100 120 140 160 180

Pred

ictio

nDa

ta

0123456

[GeV]TM





hh, hZ , hW → γγ + `±eµ(CMS-SUS-14002 - PRD)

• Excess seen in γγ + e channel (2.1 σ), consistent with BGfluctuations:

X EmissT shape for γγ + e consistent with BG.

X Several checks of mγγ show it is robust.





(h→ bb)(Z → `e/µ`e/µ)(CMS-SUS-14002 - PRD)

• Event selection criteria:1 h : = 2 b-tagged jets with mbb(100→ 150) GeV2 Z: = 1 lepton pair (e±e∓ || µ±µ∓)3 Veto 3rd lepton (e, µ or τh)

• Z+jets BG estimate:

X EmissT template from γ + jets control region.

X Normalized by data yield in EmissT < 50 GeV.

• tt, WW, ττ & tW BG’s (flavor symmetric):

X EmissT template normalized from eµ sample.

• Other SM BG’s estimated from MC.

Ent

ries

/ 10

GeV

-110

1

10

210

310

410

510 Data

Z+Jets

Flavor symmetric

Other SM

eventsµµee +

[GeV]TmissE

0 20 40 60 80 100 120 140Pre

dict

ion

Dat

a

0.60.8

11.21.4

= 8 TeVs -1CMS L = 19.5 fb

Ent

ries

/ 20

GeV

-110

1

10

210Data

Z+Jets

Flavor symmetric

Other SM

= 200 GeV1

0χ∼m

eventsµµee +

[GeV]TmissE

0 20 40 60 80 100 120 140Pre

dict

ion

Dat

a

00.5

11.5

2

= 8 TeVs -1CMS L = 19.5 fb





(h→ bb)(h→ bb)(CMS-SUS-14002 - PRD)

• Largest branching fraction (h→ bb is 56%)

• Event selection criteria:

X Lepton veto, 4 or 5 jets (≥ 2 b-tagged jets)

• hh reconstruction:

X Combination with smallest mbb differenceX Signal box: |∆mbb| < 20 GeV, < mbb >

in [100, 140] GeV.X Emiss

T significance (SMET ): better fake EmissT

rejection than plain EmissT .

(GeV)⟩bb

m⟨20 40 60 80 100 120 140 160 180 200

Eve

nts

/ 1

0 G

eV

0

2

4

6

8

10

12 Data

tt

tNon-t

= 250 GeV0

1χ∼

m

= 400 GeV0

1χ∼

m

= 8 TeVs -1 CMS L = 19.3 fb

• BG estimate (ABCD method):

X Two sidebands: mh & Nb−tags .X Measure mass SIG/BG in 2b, apply in 3b and 4b.

maxR∆0 1 2 3 4 5 6

Eve

nts

/ 0

.20

2

4

6

8

10

12 Data

tt

tNon-t

= 250 GeV0

1χ∼

m

= 400 GeV0

1χ∼

m

= 8 TeVs -1 CMS L = 19.3 fb





(h→ bb)(h→ bb)(CMS-SUS-14002 - PRD)

bin 1METS bin 2METS bin 3METS bin 4METS

bin

ME

TE

vents

/ S

0

5

10

15

20

253b sample Data

Background estimate

= 250 GeV0

1χ∼

Signal, m

= 400 GeV0

1χ∼

Signal, m

= 8 TeVs -1 CMS L = 19.3 fb

bin 1METS bin 2METS bin 3METS bin 4METS

bin

ME

TE

vents

/ S

0

2

4

6

8

104b sample Data

Background estimate

= 250 GeV0

1χ∼

Signal, m

= 400 GeV0

1χ∼

Signal, m

= 8 TeVs -1 CMS L = 19.3 fb

Observed data consistent with BG prediction





Searches with ≥ 3 Leptons and ZZ → jj``

• New interpretation of previos results are presented.

• ZZ → jj`e/µ`e/µ: requires two well reconstructed Z decays.

X Discrimination variable: EmissT

X mjj(70→ 110) GeV V also used for WZ interpretation.

• Multi-lepton: ≥ 3 charged leptons including up to 1 τh

• Events categorized by Nlep, NOSSF , Nb−jet , EmissT , and HT =

∑pT (jets).

• Table shows the most sensitive channels for hh search with mh = 150GeV .

• Excess of 2.6 σ

X Multi-lepton: PRD 90, 032006 (2014),

arXiv:1409.3168

X ZZ → jjll : EPJC 74 (2014) 3036,

arXiv:1405.7570



arXiv:1409.3168

arXiv:1405.7570


hh: GMSB h Interpretation

• GMSB scenario where χ01 & χ±1 are Higgsinos and nearly mass

degenerate (mχ01≈ mχ0

2≈ mχ±1

).

• The χ01 is the NLSP and the G is the LSP (nearly massless).

• This slide, Br(χ01 → hG = 1)

(GeV)0

1χ∼

Higgsino mass m150 200 250 300 350 400 450 500

(pb)

σ

-210

-110

1

10

CMS -1L = 19.5 fb = 8 TeVs

= 1 GeVG~; m0

1χ∼ = m±

1χ∼ = m0

2χ∼m Individual expected

G~

hG~

h→ 0

1χ∼0

1χ∼

Observed

exp.σ1 ±Expected

3l≥

b bγγ

bbbb

lγγ

exp.σ2 ± exp.σ+3

theoryσ1 ±NLO+NLL

X hh→ bbbb is the most sensitivechannel above 175 GeV

X Multi-lepton and γγ channelsmost sensitive at low h masses.

X Excess above 150 GeV (3 σ)consistent with statisticalfluctuations V mostly due tomulti-lepton.




hh and hZ GMSB Higgsino Interpretation

100% hh

(GeV)0

1χ∼

Higgsino mass m150 200 250 300 350 400 450 500

(pb)

σ

-210

-110

1

10

CMS -1L = 19.5 fb = 8 TeVs

= 1 GeVG~; m0

1χ∼ = m±

1χ∼ = m0

2χ∼m Individual expected

G~

hG~

h→ 0

1χ∼0

1χ∼

Observed

exp.σ1 ±Expected

3l≥

b bγγ

bbbb

lγγ

exp.σ2 ± exp.σ+3

theoryσ1 ±NLO+NLL

25% hh, 50% hZ , 25% ZZ

(GeV)0

1χ∼

Higgsino mass m150 200 250 300 350 400 450 500

(pb)

σ

-210

-110

1

10

210

CMS -1L = 19.5 fb = 8 TeVs

= 1 GeVG~; m0

1χ∼ = m±

1χ∼ = m0

2χ∼m

Individual expected

0

1χ∼0

1χ∼

) = 0.5G~

h→ 0

1χ∼B(

) = 0.5G~

Z→ 0

1χ∼B(

events onlyG~

ZG~

h

Observed

exp.σ1 ±Expected

theoryσ1 ±NLO+NLL

3l≥ llbb lγγ

exp.σ2 ±

100% ZZ

(GeV)0

1χ∼

Higgsino mass m150 200 250 300 350 400 450 500

(pb)

σ

-210

-110

1

10CMS -1L = 19.5 fb = 8 TeVs

= 1 GeVG~; m0

1χ∼ = m±

1χ∼ = m0

2χ∼m

Individual expected

G~

ZG~

Z→ 0

1χ∼0

1χ∼

Observed

exp.σ1 ±Expected

theoryσ1 ±NLO+NLL

3l≥

lljj

exp.σ2 ±

(GeV)0

1χ∼

Higgsino mass m150 200 250 300 350 400 450 500

)G~

h +

→

0 1χ∼

Br(

0

0.2

0.4

0.6

0.8

1CMS -1L = 19.5 fb = 8 TeVs

= 1 GeVG~; m0

1χ∼ = m±

1χ∼ = m0

2χ∼m

Combined exclusion regions,all analyses

Observed

exp.σ1 ±Expected

exp.σ2 ±

X 1D and 2D exclusion limits as afunction of higgsino mass.

X The area under the solid black line inthe 2D exclusion plot is excluded at95% CL.




Third Generation EWK-SUSY Searches

• The experimental sensitivity infinal states containing thirdgeneration particles is limited,especially in compressed spectrascenarios.

Ωχ01h2 ∼

∫∞0

1<σanν>

dx

Lian Tao and Marcela Carenahttp://arxiv.org/pdf/1205.5842v1.pdf




Electroweak SUSY Searches Probing SUSY with VBF (CMS-SUS-14005)

Probing SUSY with VBF(CMS-SUS-14005)

• Eight final states: µµjj , eµjj , µτhjj , τhτhjj (OS & LS).• For the µµjj , eµjj , µτhjj channels we use an inclusive single muon trigger,

while for the τhτhjj channels we use a di-tau trigger.





Event Selection Criteria(CMS-SUS-14005)

Summary of the event selection criteria for the different final states considered in

the analysis. Note the selections for the µµjj and eµjj channels are presented in

one column (`(e/µ)µjj) as they are very similar.

Cut `(e/µ)µjj µτh jj τhτh jj

Central Selections

Trigger HLT IsoMu24 eta2p1 HLT IsoMu24 eta2p1 HLT DMIPFTau35 Pr1pT (µ)[GeV ] ≥ 30 ≥ 30pT (e)[GeV ] ≥ 15 only eµjjpT (τh)[GeV ] ≥ 20 ≥ 45|η(`µ,e,τh )| < 2.1 < 2.1 < 2.1

Nb−tag jets (CSVL) 0 0 0

EmissT [GeV] > 75 > 75 > 30

pT (jets)[GeV ] ≥ 30/50 ≥ 50 ≥ 30|η(jets)| ≤ 5 ≤ 5 ≤ 5

∆R(`1e,µ,τh

, `2e,µ,τh

) ≥ 0.3 ≥ 0.3 ≥ 0.3

∆R(jet, `e,µ,τh ) ≥ 0.3 ≥ 0.3 ≥ 0.3

VBF Selections

∆η(jet1, jet2) > 4.2 > 4.2 > 4.2

ηjet1 · ηjet2 < 0 < 0 < 0mj, j[GeV ] ≥ 250 ≥ 250 ≥ 250

• We perform a shape-based analysis, using the mjj distribution as adiscrimination variable.





Background Estimation Strategy(CMS-SUS-14005)

• We use a common BG estimation methodology across channels:1 We obtain SFs in high purity CRs to correct for any mismodeling in

simulation, after applying central selections (No VBF selections).2 When possible, we measure the VBF efficiency from data.3 The contribution of a given BG in the SR, estimated with the method

described above, is performed using the following formula:

NDataBG = NMC

BG (central) · SFCR1central · εCR2

VBF(mjj)

4 A closure test is performed in MC. The difference between the nominaland predicted yields in the closure test, is taken as a systematic error.

5 When possible we also perform closure tests with data.6 We check that the signal contamination in the CRs is negligible.

• If the BGs are small, when possible we first show that the VBF shapesare well modelled in simulation and then simply correct the MCprediction with a SF:

NDataBG = NMC

BG (SR) · SFCR1central





tt Background Estimation For OS/LS µµ(CMS-SUS-14005)

• tt is the largest BG source for both µµ channels (OS & LS)• The estimation of this BG is done in a semi-data-driven way.• Three CRs are used:

1 CR1: SFCR1central for central selections for OS events.

2 CR2: SFCR2central for central selections for LS events.

3 CR3: measure VBF efficiency and dijet mass shape from data.

250

1

w/ iso

Isolation

N(b)

w/o iso

1

w/ iso

N(b)

w/o iso

OS SIGNAL

0

OS

21 *qq

),( jjm

1

w/ iso

Isolation

N(b)

w/o iso

1

w/ iso

Isolation

N(b)

w/o iso

CR1 CR3

CR2 CR3

Top Pair Background Estimation & Validation/Closure Strategy

Isolation

LS

CR3

CR3

LS SIGNAL





Combined mjj Distribution(CMS-SUS-14005)

500 1000 1500 2000 2500

Even

ts /

250

GeV

-310

-210

-110

1

10

210

310

410

510

610data

DY+jets

W+jets

QCD

tt

Others

= 0 GeV)0

1χ∼

= 195 GeV, m1

τ∼ = 200 GeV, m±

1χ∼=m

0

2χ∼

(mjjχ∼χ∼ →pp

CMS Preliminary (8 TeV)-119.7 fb

hτhτ, h

τµ, µ, eµµ

m(j,j) [GeV]500 1000 1500 2000 2500O

bs./P

redi

ctio

n

00.5

11.5

22.5

3





Final yields: OS Channels(CMS-SUS-14005)

Number of observed events in data and estimated background rates for the OS

search channels. The uncertainties are based on the number of observed events in

the CRs as well as the statistics in simulation.

Process µ±µ∓jj e±µ∓jj µ±τ∓h jj τ±h τ∓h jj

DY + jets 4.3± 1.7 3.7±2.11.9 19.9± 2.9 12.3± 4.4

W + jets < 0.01 4.2±3.32.5 17.3± 3.0 2.0± 1.7

VV 2.8± 0.5 3.1± 0.7 2.9± 0.5 0.5± 0.2tt 24.0± 1.7 19.0±2.3

2.4 11.7± 2.8 –QCD – – – 6.3± 1.8Higgs 1.0± 0.1 1.1± 0.5 – 1.1± 0.1VBF Z – – – 0.7± 0.2Total 32.2± 2.4 31.1±4.6

4.1 51.8± 5.1 22.9± 5.1

Observed 31 22 41 31





Final yields: LS Channels(CMS-SUS-14005)

Number of observed events in data and estimated background rates for the LS

channels. The uncertainties are based on the number of observed events in the

CRs as well as the statistics in simulation.

Process µ±µ±jj e±µ±jj µ±τ±h jj τ±h τ±h jj

DY + jets < 0.01 0±1.70 0.5± 0.2 < 0.01

W + jets 0.1± 8.2× 10−4 0±3.00 9.3± 2.3 0.5± 0.1

VV 2.1± 0.3 1.9±0.40.2 1.1± 0.2 0.1± 6.5× 10−2

tt 3.1± 0.1 3.5±0.70.9 6.7± 2.8 0.1± 1.2× 10−2

Single top – – – < 0.1QCD – – – 7.6± 0.9Higgs – – – < 0.01Total 5.4± 0.3 5.4±3.5

0.9 17.6± 3.8 8.4± 0.9

Observed 4 5 14 9





SUSY Scenario 1 – Compressed Mass Spectra& Large Mass Gaps




SUSY Scenario 2 – Compressed Mass Spectra& Large Mass Gaps

(CMS-SUS-14005)





Results - Combined Limits: Scenario 1(CMS-SUS-14005)

• No excess above the SM backgroundis observed.

• A combined observed upper boundlimit of 280 GeV and an expectedlimit on 295 GeV is set, for the largemass gap scenario where the massdifference between the chargino andthe slepton is 5 GeV and the LSPmass is 0 GeV.

• For the compressed mass spectrascenario, where the mass differencebetween the chargino and the LSP is50 GeV, we set a combined observedupper bound limit of 170 GeV and anexpected limit of 180 GeV.

[GeV]2

0χ∼ = m1

±χ∼m100 150 200 250 300 350 400

[fb

]σ

1

10

210

310Observed

= 50 GeV1

0χ∼ - m1

±χ∼, mσ 1±Expected

= 0 GeV1

0χ∼, mσ 1±Expected

jj) (LO)χ∼χ∼ →(pp σ


= 5 GeVτ∼ - m1

±χ∼m

hτhτ, h

τµ, µ, eµµ, τ τ∼ →

2

0χ∼ , τν τ∼ → 1

±χ∼





Results - Combined Limits: Scenario 2(CMS-SUS-14005)

• No excess above the SM backgroundis observed.

• A combined observed upper boundlimit of ≈ 300 GeV and an expectedlimit on ≈ 310 GeV is set, for thecompressed mass spectra scenario.

• We do not have sensitivity to excludeany masses in the large mass gapscenario, for this slepton massdefinition.

[GeV]2

0χ∼ = m1

±χ∼m100 150 200 250 300 350 400

[fb

]σ

1

10

210

310Observed

= 50 GeV1

0χ∼ - m1

±χ∼, mσ 1±Expected

= 0 GeV1

0χ∼, mσ 1±Expected

jj) (LO)χ∼χ∼ →(pp σ


±1

χ∼m21 + 0

1χ∼m2

1 = 1τ∼m

hτhτ, h

τµ, µ, eµµ, τ τ∼ →

2

0χ∼ , τν τ∼ → 1

±χ∼





Latest Limits in the Electroweak SUSY Sector

neutralino mass = chargino mass [GeV]

100 200 300 400 500 600 700 800

LSP

mas

s [G

eV]

0

100

200

300

400

500

600

700

800

900

10χ∼

= m1

±χ∼m

Z+m1

0χ∼

= m1

±χ∼m

H+m1

0χ∼

= m1

±χ∼m

ICHEP 2014 = 8 TeVs

CMS Preliminary

production1

±χ∼-2

0χ∼

) 1

0χ∼)(W 1

0χ∼ (H → 1

±χ∼ 2

0χ∼

)1

0χ∼)(W 1

0χ∼ (Z → 1

±χ∼ 2

0χ∼

) )=0.5-l+l, BF(Ll~ (

1

±χ∼ 2

0χ∼

) )=1-l+l, BF(Ll~ (

1

-χ∼ 1

+χ∼

)τν∼τ∼ (1

±χ∼ 2

0χ∼

) )=1-l+l, BF(Rl~ (

1

±χ∼ 2

0χ∼

-1SUS-13-006 19.5 fb-1SUS-14-002 19.5 fb

Observed

Expected

10χ∼

= m1

±χ∼m



DM Exotic Searches (CMS-EXOT-14004)

Exo DM Search: Razor Variabels(CMS-EXO-14004)

• The analysis search for events with at least two jets and sizeableEmissT .

• The razor variables are defined as:

MR =√

(|~pJ1|+ |~pJ1|)2 − (pJ1Z + pJ2

Z )2

R =MR

T

MR where MRT is defined as:

MRT =

√EmissT (p

J1T +p

J2T )−~Emiss

T ·(~pJ1T +~p

J2T )

2

• Sensitivity comparable to monojet.





Exo DM Search: Razor Variabels(CMS-EXO-14004)

• Study events with low values of MR (unlike SUSY).

• Discrimination variables: R2

• Dedicated trigger based in MR & R2.

• Event selection criteria:1 ≥ 1 high-quality vertex (|z | < 24cm).2 pµT > 15 GeV, |ηµ| < 2.43 peT > 15 GeV, |ηe | < 3.04 Leptons must be well isolated (∆R < 0.3)5 CVS b-jet algorithm (loose and tight).6 ≥ 2 jets with pjT > 80 GeV & |ηj | < 2.47 Events forced into a dijet+Emiss

T topology, with 2 megajets (J).8 megajets are reco. with jets with pjT > 40 GeV & |ηj | < 2.49 |Df (J1, J2)| > 2.5, MR > 200 GeV & R2 > 0.5





Event Categories(CMS-EXO-14004)

• Events are classified in eight categories.Table 1.2: Definition of the event categories based on the MR value, the muon multi-

plicity, and the output of the CSV b-tagging algorithm. For all the samples,R2 > 0.5 is required.

Sample b-tagging selection MR selection

0µ, 1µ, and 2µ no CSV loose jet

200 < MR 300 GeV (VL)300 < MR 400 GeV (L)400 < MR 600 GeV (H)

MR > 600 GeV (VH)0µbb 2 CSV tight jets

MR > 200 GeV0µb =1 CSV tight jets1µb 1 CSV tight jets2µb

Z(µµ)b 1 CSV loose jets

Table 1.3: Comparison between the observed yield for 1µ events in each MR categoryand the corresponding prediction from background simulation and from thedata-driven method, using the 2µ sample. The uncertainty on the data drivenpredictions take into account both the statistical and systematic uncertainty.The quoted uncertainty on the prediction from simulation reflects the size ofthe simulated sample.

MR Z()+jets W(`)+jets Z(``)+jets tt Predicted Predicted Observedcategory (simulation) (data driven)

VL 0.7 ± 0.3 4558 ± 32 133 ± 3 799 ± 9 5491 ± 33 5288 ± 511 5926L 0.5 ± 0.3 1805 ± 17 44 ± 2 213 ± 4 2062 ± 18 1840 ± 233 2110H 0.1 ± 0.1 915 ± 11 16 ± 1 66 ± 2 997 ± 11 629 ± 240 923

VH - 183 ± 5 2.6 ± 0.2 8.5 ± 0.8 194 ± 5 166 ± 93 143

4

• The 0µ, 0µb and 0µbb regions are searched for signal.

• The remaining regions are used as control samples.





Background Prediction - 0µ(CMS-EXO-14004)

• 0µ samples: largest source of BGs result from W + jets & Z + jets.• 1µ samples are used to predict the W + jets & Z + jets contribution.

Very Loose (VL) - MR Loose (L) - MR

RSQ0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

0

500

1000

1500

2000

2500

(8 TeV)-118.8 fb

CMSPreliminary

µ data 12R

bkg. (stat. + sys.)2R

bkg. (stat.)2R

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

33.5

4

RSQ0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

0

200

400

600

800

1000

1200

1400

1600

(8 TeV)-118.8 fb

CMSPreliminary

µ data 12R


bkg. (stat.)2R

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

33.5

4





Background Prediction - 0µ(CMS-EXO-14004)

High (H) - MR Very High (VH) - MR

RSQ0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

0

100

200

300

400

500

600

700

800

(8 TeV)-118.8 fb

CMSPreliminary

µ data 12R


bkg. (stat.)2R

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

33.5

4

RSQ0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

0

50

100

150

200

250

300

350

(8 TeV)-118.8 fb

CMSPreliminary

µ data 12R


bkg. (stat.)2R

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

33.5

4

Observed & Predicted Yields



VL 6231 ± 37 4820 ± 33 49 ± 2 555 ± 7 11655 ± 50 12773 ± 899 11623L 2416 ± 19 1513 ± 16 11 ± 1 104 ± 3 4044 ± 25 4165 ± 265 3785H 1127 ± 7 625 ± 9 2.9 ± 0.3 24 ± 1 1778 ± 11 1654 ± 686 1559

VH 229 ± 2 103 ± 3 0.2 ± 0.1 3.1 ± 0.5 335 ± 4 243 ± 156 261

Table 1.7: Expected background predictions from simulation and observed yields forcontrol samples with b-tagged jets. When available, a data-driven backgroundprediction is also provided, derived as described in the text.

Sample Z()+jets W(`)+jets Z(``)+jets tt Predicted Predicted Observedcategory (simulation) (data driven)Z(µµ)b - - 134 ± 3 17 ± 1 151 ± 3 - 175

1µb 0.2 ± 0.1 279 ± 7 11 ± 1 3038 ± 17 3328 ± 18 3405 ± 544 2920

7





Signal Region - 0µ(CMS-EXO-14004)

VL L

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

10

210

310

410

510 W + jets) + jetsνν Z(

+ jetst t (ll) + jets

*γ Z/ Data Vu-DM m = 1 GeV Vd-DM m = 1 GeV

(8 TeV)-118.8 fb

CMSPreliminary

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

32R

0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

1

10

210

310

410

510

610 W + jets) + jetsνν Z(

+ jetst t (ll) + jets

*γ Z/ Data Vu-DM m = 1 GeV Vd-DM m = 1 GeV

(8 TeV)-118.8 fb

CMSPreliminary

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

3

H VH

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

-110

1

10

210

310

410

510

610 W + jets

) + jetsνν Z( + jetst t

(ll) + jets*γ Z/

Data Vu-DM m = 1 GeV Vd-DM m = 1 GeV

(8 TeV)-118.8 fb

CMSPreliminary

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

32R

0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

-210

-110

1

10

210

310

410

510 W + jets) + jetsννZ(

+ jetstt (ll) + jets

*γZ/DataVu-DM m = 1 GeVVd-DM m = 1 GeV

(8 TeV)-118.8 fb

CMSPreliminary

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Dat

a/M

C

00.5

11.5

22.5

3





Signal Region - 0µb & 0µbb(CMS-EXO-14004)

• Use similar data-driven technique to 0µ

• Background contribution from W (→ µν)+jets & Z (→ νν)+jets ispredicted using the Z (→ µµ)b sample.

• Closure test: uses the 1µb sample.

Expected & Observed events in the 1µb sample



VL 6231 ± 37 4820 ± 33 49 ± 2 555 ± 7 11655 ± 50 12773 ± 899 11623L 2416 ± 19 1513 ± 16 11 ± 1 104 ± 3 4044 ± 25 4165 ± 265 3785H 1127 ± 7 625 ± 9 2.9 ± 0.3 24 ± 1 1778 ± 11 1654 ± 686 1559

VH 229 ± 2 103 ± 3 0.2 ± 0.1 3.1 ± 0.5 335 ± 4 243 ± 156 261

Table 1.7: Expected background predictions from simulation and observed yields forcontrol samples with b-tagged jets. When available, a data-driven backgroundprediction is also provided, derived as described in the text.

Sample Z()+jets W(`)+jets Z(``)+jets tt Predicted Predicted Observedcategory (simulation) (data driven)Z(µµ)b - - 134 ± 3 17 ± 1 151 ± 3 - 175

1µb 0.2 ± 0.1 279 ± 7 11 ± 1 3038 ± 17 3328 ± 18 3405 ± 544 2920

7

Expected & Observed events in the 0µb & 0µbb samples

Table 1.8: Expected background predictions from simulation and observed yields forsearch samples with b-tagged jets. A data-driven background prediction isalso provided, derived as described in the text.

Sample Z()+jets W(`)+jets Z(``)+jets tt Predicted Predicted Observed(simulation) (data driven)

0µbb 44 ± 3 14 ± 2 0.2 ± 0.1 204 ± 4 262 ± 5 271 ± 37 2470µb 417 ± 8 216 ± 7 2.4 ± 0.4 1480 ± 12 2116 ± 16 2231 ± 281 2282

8





Signal Region - 0µb & 0µbb(CMS-EXO-14004)

0µ b

RSQ0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

200

400

600

800

1000

1200

1400

Data

Background Pred.

(8 TeV)-118.8 fb

CMSPreliminary

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Data

/MC

00.5

11.5

22.5

3

0µ bb

RSQ0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Eve

nts

20

40

60

80

100

120

140

160

180

200

220

240

Data

Background Pred.

(8 TeV)-118.8 fb

CMSPreliminary

2R0.5 0.6 0.7 0.8 0.9 1 1.1 1.2

Data

/MC

00.5

11.5

22.5

3





Results - 0µ(CMS-EXO-14004)

• The result is interpreted in the context of a low-energy EFT:production of DM particles mediated by 6D and 7D operators.

• Operators generated assuming the existence of a heavy particlemediating the interaction between the DM and SM fields.

• Two benchmark scenarios considered:

(GeV)χM1 10 210 310

(GeV

)Λ

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

90% CL limit: AV EFT operatorµRazor-0

Expected limit

expected limitσ 1±

Observed limit

χ < 2mΛ

π/2χ < mΛ

= 80%ΛR

= 1eff

g

= 2eff

g

= 4eff

g

π = 4eff

g

(8 TeV)-118.8 fbCMSPreliminary

(GeV)χM1 10 210 310

(GeV

)Λ

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

90% CL limit: V EFT operatorµRazor-0

Expected limit


Observed limit

χ < 2mΛ

π/2χ < mΛ

= 80%ΛR

= 1eff

g

= 2eff

g

= 4eff

g

π = 4eff

g






Results - 0µb & 0µbb(CMS-EXO-14004)

• Results are interpreted in a EFT scenario, considering a scalaroperator:

(GeV)χM-110 1 10 210 310

(GeV

)Λ

50

100

150

200

250

300

350

400

Razor-b limit: Scalar EFT operator

Expected limit


Observed limit

χ < 2mΛ

π/2χ < mΛ

= 80%ΛR

π = 2eff

g

π = 3eff

g

π = 4eff

g


(GeV)χM-110 1 10 210 310

(GeV

)Λ

50

100

150

200

250

300

350

400

Razor-b limit: Scalar EFT operator

Expected limit


Observed limit

χ < 2mΛ

π/2χ < mΛ

= 25%ΛR

π = 2eff

g

π = 3eff

g

π = 4eff

g





Summary

Summary

• Several new SUSY electroweak searches have been presented.• There are some low-significance excesses in some channels, but no

evidence of SUSY yet.• Searches in Exo channels do not show evidence for DM yet.• Stay tuned for the next run of the LHC!


Summary

BACKUP


Summary

(h→ bb)(h→ bb) BG Estimation

• ABDC method.

(GeV)⟩bb

m⟨0 50 100 150 200 250

| (G

eV)

bbm∆|

0

20

40

60

80

100

120 (2b sample)tt

= 8 TeVsCMS Simulation,

(GeV)⟩bb

m⟨0 50 100 150 200 250

| (G

eV)

bbm∆|

0

20

40

60

80

100

120 (4b sample)tt

= 8 TeVsCMS Simulation,


Summary

(hh, hZ , hZ → γγ + `) Electron Channel

• 18 events in signal region vs 10.0± 2.3 from SM BG.

• Excess at low EmissT , therefore no signal-like.

• Toy MC studies of fit show that it’s stable and unbiased with properlyestimated errors.

Even

ts / 1

5 Ge

V

0

1

2

3

4

5

6

7

8

9

10 = 8 TeVs -1CMS L = 19.5 fb

+ eγγ Data

Non-higgs SM bg

SM higgs

Signal

=130 GeV±1

χ∼hW, m

=130 GeV0

1χ∼

hh, m

=130 GeV0

1χ∼

hZ, m

0 20 40 60 80 100 120 140 160 180

Pred

iction

Data

012

34

5

[GeV]missTE [GeV]γγm

100 110 120 130 140 150 160

Eve

nts

/ GeV

0

1

2

3

4

5

6

7 + eγγ DataSideband FitSignal hh

=130 GeV0

1χ∼m

= 8 TeVs -1CMS L = 19.5 fb


Summary

(hh, hZ , hZ → γγ + `)− µ Channel

Even

ts / 1

5 Ge

V

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5 = 8 TeVs -1CMS L = 19.5 fb

µ + γγ Data

Non-higgs SM bg

SM higgs

Signal

=130 GeV±1

χ∼hW, m

=130 GeV0

1χ∼

hh, m

=130 GeV0

1χ∼

hZ, m

0 20 40 60 80 100 120 140 160 180

Pred

iction

Data

0

1.25

2.5

[GeV]missTE [GeV]γγm

100 110 120 130 140 150 160E

vent

s / G

eV0

1

2

3

4

5

6

7 µ + γγ DataSideband FitSignal hh

=130 GeV0

1χ∼m

= 8 TeVs -1CMS L = 19.5 fb


Summary

(hh, hZ , hZ → γγ + `)− µ Channel

• SMET : χ2 of the observedEmissT with the null (no

true EmissT ) hypothesis.

• Uses the covariant matrixfor each reconstructedobject in the Emiss

T sum:

U i =

(σ2ETi, 0

0,E 2Tiσ2φi

)(1)

• For details on the EmissT

significance:http://arxiv.org/pdf/1106.5048v1.pdf

Bin 0 Bin 1 Bin 2 Bin 3 Bin 4

Eve

nts

1

10

210

310

410

510

610 (SM)

T

miss, genuine ETmissE

(SM)T

miss, genuine EMET

S

(SUSY)T

miss, genuine ETmissE

(SUSY)T

miss, genuine EMET

S

T

miss, spurious ETmissE

T

miss, spurious EMET

S

= 8 TeVs -1 CMS Simulation L = 19.3 fb

(GeV)TmissE 0-106 106-133 133-190 190-250 >250

METS 0-30 30-50 50-100 100-150 >150

• Distribution of simulated tt (genuineEmissT (SM)), signal (genuine Emiss

T

(SUSY)), and QCD multijet (spuriousEmissT ) events using loosened selection

criteria in bins of SMET and EmissT .


Summary

Multilepton Excess

• Total of 64 channels, each with 3 EmissT bins, in ≥ 3 analysis

(published in PRD [PRD 90, 032006 (2014)] -http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.032006).

• Excess seen in one channel, where:1 4 leptons with one oposite sign electric charge, same flavor (OSSF)

lepton pair and one hadronic tau decay candidate.2 m`` of the OSSF pair is not near the Z mass.3 No b-tagged jets.4 HT < 200 GeV (HT =

∑pjetsT )

• Probability to observe 22 or more events with 10.1± 2.4 BG eventsexpected is about 1%.

• Taking into account that there were 64 independent channels, theprobability to observe one channel with such fluctuation is about 50%.


Summary

hZ → bb`e/µ`e/µ(CMS-SUS-14002 - PRD)

• Observed data consistent with BG prediction



Summary

Multilepton Excess


Summary

Electroweak

hW (CMS-SUS-14-002)

• h → γγ channels added.

• Single lepton: h → bb, W → lν

• Same-sign di-lepton: h → WW W → lν

• Multilepton: h → WW/ZZ/ττ W → lν

[GeV]0

2χ∼

=m±

1χ∼m

150 200 250 300 350 400

[G

eV]

0 1χ∼m

0

20

40

60

80

100

120

140

95%

CL

uppe

r lim

it on

cro

ss s

ectio

n (f

b)

210

310

= 8 TeVs -1CMS L = 19.5 fb

95% CL CLs NLO Exclusions

theoryσ1 ±Observed

exp.σ1 ±Expected

h = m0

1χ∼

- m0

2χ∼

m

±

1χ∼ 0

2χ∼ → pp

0

1χ∼ h → 0

2χ∼

0

1χ∼ W → ±

1χ∼

ZW (CMS-SUS-13-006)

• h → γγ channels added.

• Z + jj : Z → ll W → jj

• Multilepton: Z → ll W → lν

• Combination is also shown.

[GeV]0

2χ∼

=m±

1χ∼m

100 150 200 250 300 350 400

[G

eV]

0 1χ∼m

0

20

40

60

80

100

120

140

160

180

200

220

240

95%

CL

uppe

r lim

it on

cro

ss s

ectio

n (f

b)

210

310

-1 = 8 TeV L = 19.5 fbsCMS 95% CL CLs NLO Exclusions

theoryσ1± l 3⊕j2lObserved 2

experimentσ1± l 3⊕j2lExpected 2

experimentσ -2l 3⊕j2lExpected 2 onlylObserved 3

onlyj2lObserved 2Z = m0

1χ∼

- m0

2χ∼

m

±

1χ∼ 0

2χ∼ → pp

0

1χ∼ Z → 0

2χ∼

0

1χ∼ W → ±

1χ∼


Summary

hh and hZ GMSB Higgsino Interpretation

2D Exclusion Region and Analysis Sensitivity

(GeV)0

1χ∼

Higgsino mass m150 200 250 300 350 400 450 500

)G~

h +

→

0 1χ∼B

r(

0

0.2

0.4

0.6

0.8

1CMS -1L = 19.5 fb = 8 TeVs

= 1 GeVG~; m0

1χ∼ = m±

1χ∼ = m0

2χ∼m

Combined exclusion regions,all analyses

Observed

exp.σ1 ±Expected

exp.σ2 ±


Summary

Multilepton Excess

• Signal MC generation: MadGraph 5.1.5.4

• Up to 2 ISR partons allowed.

• Detector response from fast simulation, excess h→ bbh→ bb whichuses Geant4.

• Cross sections NLO+NLL for GMSB hh, hZ, ZZ.

• For GMSB, the two lightest neutralinos and lightest chargino are purehiggsinos and mass degenerate.

X Any SM particle from χ20 and χ±1 are assumed too soft to be detected.

• Decays of GMSB NLSP use pure phase-space matrix elements.


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