David Stuart , UC Santa Barbara Rencontres de Blois, May 2013stuart.physics.ucsb.edu/Presentations/Stuart_Blois.pdfSUSY searches, David Stuart, UCSB 4! With 20/fb of LHC lumi, would

SUSY searches, David Stuart, UCSB ‏" 1!

SUSY Searches David Stuart , UC Santa Barbara Rencontres de Blois, May 2013

Background photo: CMS detector in access (i.e., broken-symmetry) mode


Super Symmetry overview

Just as B & W0 mix to give γ and Z, the gauginos & higgsinos mix to give charginos & neutralinos Dark matter candidate in Lightest SUSY Particle (LSP) if R-parity is conserved.


Rich phenomenology with many signatures of “s-particle” production & decay


With 20/fb of LHC lumi, would have produced ~100 events for 1.2 TeV gluinos 700 GeV stops 600 GeV charginos & neutralinos ≡ “ewkinos”

Potentially large cross sections at LHC 8 TeV cross sections [arXiv:1206.2892]


Model γ, τ, µe, Jets missTE ]-1 [fbLdt∫ Mass limit Reference

MSUGRA/CMSSM 0 2-6 jets Yes 20.3 )g~)=m(q~m( ATLAS-CONF-2013-047MSUGRA/CMSSM µ1 e, 4 jets Yes 5.8 )g~)=m(q~m( ATLAS-CONF-2012-104MSUGRA/CMSSM 0 7-10 jets Yes 20.3 )q~any m( ATLAS-CONF-2013-054

0 1χ∼q→q~, q~q~ 0 2-6 jets Yes 20.3 ) = 0 GeV0 1χ

∼m( ATLAS-CONF-2013-0470 1χ∼qq→g~, g~g~ 0 2-6 jets Yes 20.3 ) = 0 GeV0 1χ

∼m( ATLAS-CONF-2013-047)± χ

∼qq→g~ (± χ∼Gluino med. µ1 e, 2-4 jets Yes 4.7 ))g~)+m(0 1χ

∼) = 0.5(m(±χ∼) < 200 GeV, m(0 1χ

∼m( 1208.46880 1χ

∼0 1χ∼qqqqll(ll)→g~g~ (SS)µ2 e, 3 jets Yes 20.7 ) < 650 GeV0 1χ

∼m( ATLAS-CONF-2013-007 NLSP)l

~GMSB ( µ2 e, 2-4 jets Yes 4.7 < 15βtan 1208.4688

NLSP)l~

GMSB ( τ1-2 0-2 jets Yes 20.7 >18βtan ATLAS-CONF-2013-026GGM (bino NLSP) γ2 0 Yes 4.8 ) > 50 GeV0 1χ

∼m( 1209.0753GGM (wino NLSP) γ + µ1 e, 0 Yes 4.8 ) > 50 GeV0 1χ

∼m( ATLAS-CONF-2012-144GGM (higgsino-bino NLSP) γ 1 b Yes 4.8 ) > 220 GeV0 1χ

∼m( 1211.1167GGM (higgsino NLSP) (Z)µ2 e, 0-3 jets Yes 5.8 ) > 200 GeVH

~m( ATLAS-CONF-2012-152

Gravitino LSP 0 mono-jet Yes 10.5 eV-4) > 10G~

m( ATLAS-CONF-2012-147

0 1χ∼bb→g~ 0 3 b Yes 12.8 ) < 200 GeV0 1χ

∼m( ATLAS-CONF-2012-1450 1χ∼tt→g~ (SS)µ2 e, 0-3 b No 20.7 ) < 500 GeV0 1χ

∼m( ATLAS-CONF-2013-0070 1χ∼tt→g~ 0 7-10 jets Yes 20.3 ) <200 GeV0 1χ

∼m( ATLAS-CONF-2013-0540 1χ∼tt→g~ 0 3 b Yes 12.8 ) < 200 GeV0 1χ

∼m( ATLAS-CONF-2012-1450 1χ∼b→1b

~, 1b

~1b

~0 2 b Yes 20.1 ) < 100 GeV0 1χ

∼m( ATLAS-CONF-2013-053± 1χ∼t→1b

~, 1b

~1b

~ (SS)µ2 e, 0-3 b Yes 20.7 )0 1χ

∼) = 2 m(± 1χ∼m( ATLAS-CONF-2013-007

± 1χ∼b→1t

~ (light), 1t

~1t

~µ1-2 e, 1-2 b Yes 4.7 ) = 55 GeV0 1χ

∼m( 1208.4305, 1209.21020 1χ

∼Wb→1t~

(light), 1t~1t

~µ2 e, 0-2 jets Yes 20.3 )± 1χ

∼) << m(1t~

) - m(W) - 50 GeV, m(1t~

) = m(0 1χ∼m( ATLAS-CONF-2013-048

± 1χ∼b→1t

~ (medium), 1t

~1t

~µ2 e, 0-2 jets Yes 20.3 ) = 10 GeV± 1χ

∼)-m(1t~

) = 0 GeV, m(0 1χ∼m( ATLAS-CONF-2013-048

± 1χ∼b→1t

~ (medium), 1t

~1t

~0 2 b Yes 20.1 ) = 5 GeV± 1χ

∼)-m(± 1χ∼) < 200 GeV, m(0 1χ

∼m( ATLAS-CONF-2013-0530 1χ∼t→1t

~ (heavy), 1t

~1t

~µ1 e, 1 b Yes 20.7 ) = 0 GeV0 1χ

∼m( ATLAS-CONF-2013-0370 1χ∼t→1t

~ (heavy), 1t

~1t

~0 2 b Yes 20.5 ) = 0 GeV0 1χ

∼m( ATLAS-CONF-2013-024 (natural GMSB)1t

~1t

~ (Z)µ2 e, 1 b Yes 20.7 ) > 150 GeV0 1χ

∼m( ATLAS-CONF-2013-025+Z1t

~→2t

~, 2t

~2t

~ (Z)µ3 e, 1 b Yes 20.7 ) + 180 GeV0 1χ

∼) = m(1t~

m( ATLAS-CONF-2013-025

0 1χ∼l→l

~, L,Rl

~L,Rl

~µ2 e, 0 Yes 20.3 ) = 0 GeV0 1χ

∼m( ATLAS-CONF-2013-049)ν∼(lνl

~→+ 1χ

∼, - 1χ∼+ 1χ

∼µ2 e, 0 Yes 20.3 ))0 1χ

∼) + m(± 1χ∼) = 0.5(m(ν

∼,l~

) = 0 GeV, m(0 1χ∼m( ATLAS-CONF-2013-049

)ν∼τ(ντ∼→+ 1χ∼, - 1χ

∼+ 1χ∼

τ2 0 Yes 20.7 ))0 1χ∼) + m(± 1χ

∼) = 0.5(m(ν∼,τ∼) = 0 GeV, m(0 1χ

∼m( ATLAS-CONF-2013-028)νν∼l(Ll

~ν∼), lνν

∼l(Ll~νLl

~ → 0 2χ

∼± 1χ∼

µ3 e, 0 Yes 20.7 ))0 1χ∼) + m(± 1χ

∼) = 0.5(m(ν∼,l

~) = 0, m(0 1χ

∼), m(0 2χ∼) = m(± 1χ

∼m( ATLAS-CONF-2013-0350 1χ∼ (*)Z 0 1χ

∼(*) W → 0 2χ∼± 1χ

∼µ3 e, 0 Yes 20.7 ) = 0, sleptons decoupled0 1χ

∼), m(0 2χ∼) = m(± 1χ

∼m( ATLAS-CONF-2013-035

± 1χ∼ prod., long-lived ± 1χ

∼± 1χ∼Direct 0 1 jet Yes 4.7 ) < 10 ns± 1χ

∼(τ1 < 1210.2852, R-hadronsg~Stable µ0-2 e, 0 Yes 4.7 1211.1597

β, low τ∼GMSB, stable µ2 e, 0 Yes 4.7 < 20β5 < tan 1211.1597

0 1χ∼,long-lived G

~γ→0 1χ

∼GMSB, γ2 0 Yes 4.7 ) < 2 ns0 1χ∼(τ0.4 < 1304.6310

(RPV)µ qq→ 0 1χ∼

µ1 e, 0 Yes 4.4 decoupledg~ < 1 m, τ1 mm < c 1210.7451

µe+→τν∼+X, τν

∼→LFV pp µ2 e, 0 - 4.6 =0.05132λ=0.10, ,

311λ 1212.1272τ)+µe(→τν

∼+X, τν∼

→LFV pp τ + µ1 e, 0 - 4.6 =0.051(2)33λ=0.10, ,311λ 1212.1272

Bilinear RPV CMSSM µ1 e, 7 jets Yes 4.7 < 1 mmLSPτ), cg~) = m(q~m( ATLAS-CONF-2012-140eνµ,eµνee→0 1χ

∼, 0 1χ∼W→+ 1χ

∼, - 1χ∼+ 1χ

∼µ4 e, 0 Yes 20.7 > 0121λ) > 300 GeV, 0 1χ

∼m( ATLAS-CONF-2013-036τντ,eeνττ→0 1χ

∼, 0 1χ∼W→+ 1χ

∼, - 1χ∼+ 1χ

∼τ + µ3 e, 0 Yes 20.7 > 0133λ) > 80 GeV, 0 1χ

∼m( ATLAS-CONF-2013-036 qqq→ g~ 0 6 jets - 4.6 1210.4813

bs→1t~

t, 1t~

→g~ (SS)µ2 e, 0-3 b Yes 20.7 ATLAS-CONF-2013-007

Scalar gluon 0 4 jets - 4.6 incl. limit from 1110.2693 1210.4826)χWIMP interaction (D5, Dirac 0 mono-jet Yes 10.5 ) < 80 GeV, limit of < 687 GeV for D8χm( ATLAS-CONF-2012-147

sear

ches

Incl

usiv

e m

ed.

g~ g

en.

rd 3

dire

ct p

rodu

ctio

n g

en. s

quar

ksrd 3

dire

ct E

W p

artic

les

Long

-live

dR

PVO

ther

1.8 TeVg~, q~

1.24 TeVg~, q~

1.1 TeVg~

740 GeVq~

1.3 TeVg~

900 GeVg~

1.1 TeVg~

1.24 TeVg~

1.4 TeVg~

1.07 TeVg~

619 GeVg~

900 GeVg~

690 GeVg~

645 GeV scale1/2F

1.24 TeVg~

900 GeVg~

1.14 TeVg~

1.15 TeVg~

100-630 GeV1b~

430 GeV1b~

167 GeV1t~

220 GeV1t~

150-440 GeV1t~

150-580 GeV1t~

200-610 GeV1t~

320-660 GeV1t~

500 GeV1t~

520 GeV2t~

85-315 GeVl~

125-450 GeV± 1χ∼

180-330 GeV± 1χ∼

600 GeV0 2χ∼, ± 1χ

∼

315 GeV0 2χ∼, ± 1χ

∼

220 GeV± 1χ∼

985 GeVg~

300 GeVτ∼

230 GeV0 1χ∼

700 GeVq~

1.61 TeVτν∼

1.1 TeVτν∼

1.2 TeVg~, q~

760 GeV± 1χ∼

350 GeV± 1χ∼

666 GeVg~

880 GeVg~

100-287 GeVsgluon704 GeVM* scale

Mass scale [TeV]-110 1 = 7 TeVs

full data = 8 TeVs

partial data = 8 TeVs

full data

ATLAS SUSY Searches* - 95% CL Lower LimitsStatus: LHCP 2013

ATLAS Preliminary-1 = (4.4 - 20.7) fbLdt∫ = 7, 8 TeVs

theoretical signal cross section uncertainty.σ*Only a selection of the available mass limits on new states or phenomena is shown. All limits quoted are observed minus 1

Sear

ches

acr

oss m

any

sign

atur

es

Gluinos

stop

ewkinos


I will focus on searches targeting the mH hierarchy problem

Papucci, Ruderman, Weiler, arXiv:1110.6926

≈ 1.5 TeV

≈ 0.5 TeV

≈ 0.2 TeV

!mH2 = H

H


I will focus on stop, gluino and ewkino searches


≈ 1.5 TeV

≈ 0.5 TeV

≈ 0.2 TeV

!mH2 = H

H


Top squark (aka “stop”) searches

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3



P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b



Searches in several modes, 0, 1, and 2 leptons, & different kinematic regions.

P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b


1-lepton stop searches: dominant background is top quark tails

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3



“Lost” dilepton backgrounds dominate at high MT.

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

ATLAS-CONF-2013-037

or τ


MT2τ

MT2

[GeV]WT2M

100 150 200 250 300 350 400 450 500

Entri

es /

25

GeV

1

10

210

310

410

510

610Data

topl1

ll →ttW+jetsrare

(650/50) x100001χ∼ t→ t~

Pre-selection

-1Ldt = 19.5 fb∫ = 8 TeV, sCMS Preliminary

Dat

a/M

C

00.5

11.5

2


which is more sensitive to this background topology because of the additional kinematic information

applied in the definition. Specifically, the variable MWT2 (where the superscript W represents the on-

shell intermediate W information is included when combining lepton and neutrino) can no longer be

cast into the “maximum of two side’s MT ” form, but is instead defined directly as the minimization 5

MWT2 = min

{

my consistent with:

[

!pT1 + !pT2 = !EmissT , p21 = 0 , (p1 + p!)2 = p22 = M2

W ,(p1 + p! + pb1)

2 = (p2 + pb2)2 = m2

y

]}

.(3)

0 100 200 300 400 5000.00

0.05

0.10

0.15

0.20

0.25

MT2W !GeV"

Fraction

t t dilept t semimt!"500 GeV

Figure 5: Schematic of MWT2, along with its signal and background event distributions. Here all of the

information is used, including theW -on-shell mass condition on both sides. As with the other variables,p2 is the entire missing on-shell W , but p1 is the neutrino that gets paired with the visible lepton toform the other on-shell W . All the events in the plot have Emiss

T > 150 GeV and MT > 100 GeV. Theevents with no compatible top mass under 500GeV are placed in the last bin.

The diagram, along with signal and background distributions are shown in Fig. 5. We use the same

method as before to pick the two b-jets, and a method similar to that for M b!T2 is used to choose which

b-jet gets paired with the visible lepton. Calculating this variable can be done efficiently in a similar

way as the MT2 calculation in Ref. [47] by generalizing the method there to this case. For perfect

measurements, this variable for the dileptonic tt̄ backgrounds is less than the true top quark mass

since the top mass should be compatible with all background events. On the other hand, the signal

events do not need to satisfy such a bound, because of its different topology and additional missing

massive particles χ̃. For some of the signal events we may not even be able to find a compatible

mass because we apply the variable to a wrong topology with the wrong mass-shell conditions. The

5The programs for calculating all new variables defined in this paper can be downloaded athttps://sites.google.com/a/ucdavis.edu/mass/

8

CMS-SUS-13-011

Signal


stop → top LSP stop → b Chargino

High mLSP

High mstop

Medium mstop

High mstop and high mChi

1-lepton stop searches: many kinematic suppressors ATLAS-CONF-2013-037

ATLAS-CONF-2013-037


stop → top LSP

High mLSP

High mstop

Medium mstop



ATLAS-CONF-2013-037

/ τ

stop → b Chargino


stop → top LSP

High mLSP

High mstop

Medium mstop



ATLAS-CONF-2013-037

Signal Bkgnd

stop → b Chargino


1-lepton stop searches: sample results

[GeV]TM0 50 100 150 200 250 300

Entri

es /

60

GeV

1

10

210

310

Data topl1

ll →ttW+jetsrare

(650/50/0.5)±

1χ∼ b→ t~SM +

(x=0.5) BDT3±

1χ∼ b→ t~


Dat

a/M

C

00.5

11.5

2

ATLAS-CONF-2013-037 CMS-SUS-13-011 MET MT

1 10

10

1


1-lepton stop searches: limits for stop → top LSP

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

ATLAS-CONF-2013-037

10 fb

100 fb

mLSP = 50



ATLAS-CONF-2013-037

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

Stop mass

LSP

mas

s



[GeV]t~ m200 300 400 500 600 700 800

[G

eV]

10 χ∼m

0

50

100

150

200

250

300

350

400

upp

er li

mit

[pb]

σ

-310

-210

-110

1

10

210

unpolarized topBDT analysis

01χ∼ t → t~*, t~ t~ →pp )theory

σ1±Observed ()σ1±Expected (

)-1Observed (9.7 fb


t

= M

10

χ∼

- m

t~mW

= M

10

χ∼

- m

t~mP1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

P1

P2

t̃∗

t̃

t̄

t

b̄

W−

χ̃01

χ̃01

W+

b

3

LSP

mas

s

Stop mass CMS-SUS-13-011


1-lepton stop searches: limits for stop → b chargino

[GeV]t~ m200 300 400 500 600 700 800

[G

eV]

10 χ∼m

0

50

100

150

200

250

300

350

400

upp

er li

mit

[pb]

σ

-310

-210

-110

1

10

210

BDT analysis

+1χ∼ b → t~*, t~ t~ →pp )theory


)-1Observed (9.7 fb

01χ∼

+ 0.25 mt~ = 0.75 m±

1χ∼

m


W

= m

01χ∼

- m±1χ∼m

P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

CMS-SUS-13-011

SUSY searches, David Stuart, UCSB ‏"

[GeV]t~ m350 400 450 500 550 600 650 700 750 800

[G

eV]

10 χ∼m

0

50

100

150

200

250

300

350

400

upp

er li

mit

[pb]

σ

-310

-210

-110

1

10

210

BDT analysis

+1χ∼ b → t~*, t~ t~ →pp )theory


01χ∼

+ 0.75 mt~ = 0.25 m±

1χ∼

m


W = m

01χ∼

- m±1χ∼m

22!


P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

CMS-SUS-13-011



P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

P1

P2

t̃∗

t̃χ̃−

W−

χ̃+

W+

b̄

χ̃01

χ̃01

b

mchargino= 150

ATLAS-CONF-2013-037


stop searches: limit summary

[GeV]1t

~m100 200 300 400 500 600 700

10

+mt <

m1t~

m

10

+ m

W

+ m

b

< m

1t~m

200 300 400 500 600

)1

0 m! = 2 1

"

( m1

"

+mb < m

1t~m

< 106 GeV 1" m

+5 G

eV)

10

= m

1"

( m1"

+mb

< m

1t~m

< 103.5 GeV1"m

[GeV

]10

m

0

100

200

300

400

500

600

Observed limits)theoObserved limits (-1

Expected limits

10 m! = 2 "

1m

-1 = 20-21 fbintL

- 10 GeV1t

~ = m"1

m-1 = 20.3 fbintL

= 150 GeV"1

m-1 = 20.7 fbintL = 106 GeV"

1m

-1 = 4.7 fbintL

+ 5 GeV10 = m"

1m

-1 = 20.1 fbintL

-1 = 4.7 fbintL -1 21 fb intL10W b

-1 = 20 fbintL

ATLAS Preliminary

production1t~1t

~ Status: LHCP 2013

=8 TeVs -1 = 20 - 21 fbintL =7 TeVs -1 = 4.7 fbintL0L ATLAS-CONF-2013-024

1L ATLAS-CONF-2013-037

-



-



1L CONF-2013-037, 2L CONF-2013-048

0L [1208.1447]

1L [1208.2590]

2L [1209.4186]

-

-

2L [1208.4305], 1-2L [1209.2102]

-

-

1-2L [1209.2102]

10 (*) W

1",

1" b 1t

~10 W b 1t

~ / 10 t 1t

~

10 t 1t

~0L, 10 t 1t

~1L, 10 t 1t

~2L, 10 W b 1t

~2L, + 5 GeV

10 = m"

1

0L, m = 106 GeV"

1, m

1" b 1t

~1-2L, = 150 GeV"

1, m

1" b 1t

~1L, - 10 GeV

1t~ = m"

1, m

1" b 1t

~2L,

10 m! = 2 "

1, m

1" b 1t

~1-2L,

Includes also new results from 0-lepton and dilepton searches

stop → top + LSP stop → b + chargino




!mH2 = H

H ≈ 1.5 TeV

≈ 0.5 TeV

≈ 0.2 TeV


Gluino searches


Gluino searches


Gluino searches

b s

1~~ ttg

1~b 1

~b

1~b 0

11~~ ,mm

01

(*)1

~~ W

1~~ bbg

1~t

01~t

Gluino-‐stop ( ) on-‐shell

Gluino-‐stop ( ) degenerate ( )

Gluino-‐stop ( ) off-‐shell ( ) 01~t ttg mmm ~~

Gluino-‐stop ( ) on-‐shell ( ) 01~t ttg mmm ~~

Gluino-‐stop (bs) RPV

qqg ~~

1~'q

02~q

01

(*) ~W~,~

~,~

Gluino-‐squark (via W)

Gluino-‐squark (via slepton)

direct sbottom ( ) fixed

direct sbottom ( ) varied

direct squark (via slepton)

Searches in many modes: 0, 1, 2, 2++/--, 3, 4 leptons, various Njets and Nb, etc.

SUSY searches, David Stuart, UCSB ‏" ,W)µ(φΔ0 0.5 1 1.5 2 2.5 3

Even

ts

-210

-110

1

10

210

310W

1l→tt2l→tt

Z=600)

LSP=1000,M

g~SMS(M

=300)LSP

=1150,Mg~

SMS(M=0)

LSP=1250,M

g~SMS(M

Muons

CMS Simulation = 8 TeVs -1L = 19.4 fb

>500 GeVTH<450 GeVlep

T350<S

29!

Gluino searches: 1-lepton + multijets and b’s

Njets ≥ 6, Nb ≥ 2, HT ≥ 500 1). Binned search in MET ≥ 250 - Predict from charged lepton pT. 2). Binned search in - Δφ(lepton,W) > 1 - ST

lep ≈ pT(W) ≥ 250

Δφ resolution improves with boost

CMS-SUS-13-007 &




lep ≈ pT(W) ≥ 250


CMS-SUS-13-007 &

SUSY searches, David Stuart, UCSB ‏" ) [GeV]g~m(400 600 800 1000 1200 1400

) [G

eV]

0 χ∼m

(

0

100

200

300

400

500

600

700

NLO-NLL exclusions

theoryσ 1 ± Observed T+HTE

experimentσ 1 ± Expected T+HTE

theoryσ 1 ± Observed φΔ+lep

TS

experimentσ 1 ± Expected φΔ+lep

TS

CMS Preliminary = 8 TeVs -119.4 fb

0χ∼ t t→ g~, g~ g~ →pp

Single-lepton2≥b 6, N≥jet N

31!



lep ≈ pT(W) ≥ 250


CMS-SUS-13-007 &


Gluino searches: 0-lepton, 7-10 jets

Two search “streams”: Bins of NJet & Nb Hemisphere mass (MJ

Σ)

Main backgrounds: QCD – measure at low ttjets – measure in 1-lepton, low mT Z→νν – normalize MC in 2-lepton

ATLAS-CONF-2013-054




Σ)


ATLAS-CONF-2013-054




Σ)


ATLAS-CONF-2013-054




Σ)


ATLAS-CONF-2013-054


Gluino searches: multileptons ATLAS-CONF-2013-007 SUS-13-008

Dominant background from semilepton b-decays faking the isolated lepton signature

With four W’s, BR is high to 3 leptons or same-sign dileptons.

SUSY searches, David Stuart, UCSB ‏"

-1 = 19.5 fbint = 8 TeV, Ls CMS Preliminary On-Z+Off-Z events

[GeV]±

l±lM0 50 100 150

Even

ts /

5 G

eV

05

1015202530354045 data

µe/non-prompt WZ+ZZZttWttZbt

rare SMtotal bkg unc.

[GeV]TM0 50 100 150 200

Even

ts /

20 G

eV10203040506070

> 50 GeVmissTE

>0b-tagsN

37!

Gluino searches: multileptons

Search in regions of Nb, MET, MT & mll

SUS-13-008

Dominant background from semilepton b-decays faking the isolated lepton signature, for all but on-Z


Gluino searches: same-sign dileptons


ATLAS-CONF-2013-007

Njet Nb

Charge mis-id (yellow) is only dominant at low Nb. Then fakes…


Gluino searches: multileptons

At large meff,


ATLAS-CONF-2013-007

meff

Rare SM backgrounds, like ttW and ttZ become important.


Gluino searches: Limits summary

[GeV]g~m500 600 700 800 900 1000 1100 1200 1300

[GeV

]10

m

200

400

600

800

1000

forbidden

10

t tg~

not included.theorySUSY95% CL limits.

= 8 TeVs, 10t tg~ production, g~-g~ Status: LHCP 2013

PreliminaryATLAS

ExpectedObservedExpectedObservedExpectedObservedExpectedObserved

10 jets0-lepton, 7 -

3 b-jets0-lepton,

4 jets3-leptons,

3 b-jets2-SS-leptons, 0 -

ATLAS-CONF-2013-054

ATLAS-CONF-2012-145

ATLAS-CONF-2012-151

ATLAS-CONF-2013-007

]-1 = 20.3 fbint

[L

]-1 = 12.8 fbint

[L

]-1 = 12.8 fbint

[L

]-1 = 20.7 fbint

[L

gluino mass [GeV]500 600 700 800 900 1000 1100 1200 1300 1400 1500

LSP

mas

s [G

eV]

0

100

200

300

400

500

600

700

800

ObservedSUSYtheoryσObserved -1

Expected

m(gluin

o) - m

(LSP) =

2 m(to

p)

LHCP 2013 = 8 TeVs

CMS Preliminary10χ∼ t t →g~ production, g~-g~

-1) 19.4 fbT+HTESUS-12-024 0-lep (-1 6) 19.4 fb≥

jetsSUS-13-007 1-lep (n

-1SUS-12-017 2-lep (SS+b) 10.5 fb-1SUS-13-008 3-lep (3l+b) 19.5 fb

Limits up to 1.3 TeV on mgluino for low mLSP Near kinematic limit, sensitivity plateaus at mLSP ≈ 550 GeV


Gluino searches: Limits summary

Gluino to sbottom mode, from 0-lepton + ≥3 b search, covers a similar range.

gluino mass [GeV]500 600 700 800 900 1000 1100 1200 1300 1400 1500

LSP

mas

s [G

eV]

0

100

200

300

400

500

600

700

800

900

1000

Observed

SUSYtheoryσObserved -1

Expected

kinem

atica

lly fo

rbidden

Moriond 2013 = 8 TeVs

CMS Preliminary10χ∼ b b →g~ production, g~-g~

-1) 19.4 fbT+HTESUS-12-024 0-lep (

-1) 11.7 fbTαSUS-12-028 0-lep (




!mH2 = H

H ≈ 1.5 TeV

≈ 0.5 TeV

≈ 0.2 TeV


EWKino searches with trileptons





[GeV]-l+lM0 20 40 60 80 100 120 140 160 180 200

[GeV

]T

M

0

50

100

150

200

250e

±

e±eµ

±

e±ee

±

µ±µµ

±

µ±µ

e

±

e±eµ

±

e±ee

±

µ±µµ

±

µ±µ

CMS Preliminary -1 = 9.2 fbint = 8 TeV, Ls

Handles are: dilepton mass, MT, MET & Nb.


EWKino searches with multileptons


ATLAS-CONF-2013-035

MET

On-Z




ATLAS-CONF-2013-035

MET

10

1 On-Z




ATLAS-CONF-2013-035

MT

10

1 On-Z


EWKino searches with trileptons ATLAS-CONF-2013-035

Chargino/Neutralino mass→

LSP

mas

s→


EWKino searches with trileptons ATLAS-CONF-2013-035

[GeV]02χ∼

=m±

1χ∼

m100 150 200 250 300 350 400

[G

eV]

0 1χ∼m

0

50

100

150

200

[fb

]σ

95%

CL

uppe

r lim

it on

210

310

Z <

m0

1χ∼ - m0

2χ∼m

-1 = 9.2 fbint = 8 TeV, LsCMS Preliminary

95% C.L. CLs NLO Exclusionstheory

σ 1 ± l+3j2lObserved 2σ 1 ± l2j+3lExpecteded 2

onlylObserved 3 onlyj2lObserved 2

±

1χ∼ 0

2χ∼ → pp

01χ∼ Z → 0

2χ∼

01χ∼ W → ±

1χ∼

SUS-12-022 LS

P m

ass→

Chargino/Neutralino mass→


EWKino searches with dileptons ATLAS-CONF-2013-049

Fake leptons predicted from data. Other bkgds taken from control norm’d MC. WW dominant

Two modes:

METrel MT2


EWKino searches with dileptons ATLAS-CONF-2013-049


Many other searches, e.g., staus, long-lived or R-parity violating

RPV wouldn’t naturally explain DM, but could still address naturalness. Low MET, but gain other signatures like resonances


I only sampled a few – appetizer for this afternoon’s session: Inclusive squark and gluino searches, Lukas Fritz Marti Third generation SUSY searches, Riccardo Bellan EWK production of gauginos and sleptons, Steven Farrell

Mass scales [GeV]0 200 400 600 800 1000 1200

0χ∼ l → l

~

0χ∼ 0

χ∼ν τ ll→ ±χ∼ 2

0χ∼

0χ∼ 0

χ∼ W Z → 2

0χ∼ ±χ∼

0χ∼

0χ∼νν

-l+ l→ -χ∼+χ∼ 0

χ∼ 0χ∼ν τττ → ±χ∼

2

0χ∼

0χ∼ 0

χ∼ν lll → ±χ∼ 2

0χ∼

0χ∼ bZ → b

~0χ∼ tW → b

~0χ∼ b → b

~

)0χ∼ W → +χ∼ b(→ t~

)0χ∼ W→ +χ∼ b(→ t~

0χ∼ t → t~

0χ∼ t → t~

0χ∼ q → q~

0χ∼ q → q~

0χ∼ btW→ g~

)0χ∼γ →

2

0χ∼ qq(→ g~

)0χ∼ W→

±χ∼|0

χ∼γ→2

0χ∼ qq(→ g~

)0χ∼ Z →

2

0χ∼ qq (→ g~

)0χ∼ ν± l→ ±χ∼ qq(→ g~

)0χ∼ t→ t~ t(→ g~

)0χ∼ |0

χ∼ W→±χ∼ qq(→ g~)0

χ∼ |0χ∼ τ τ →2χ∼ qq(→ g~

)0χ∼

-l+ l→2

0χ∼ qq (→ g~

0χ∼ tt → g~

0χ∼ bb → g~

0χ∼ qq → g~

0χ∼ qq → g~

SUS-12-022 L=9.20 /fb

SUS-13-008 L=19.50 /fb

SUS-13-011 L=19.50 /fb x = 0.25x = 0.50

x = 0.75

SUS-13-008 L=19.50 /fb

SUS-12-001 L=4.93 /fb

SUS-11-010 L=4.98 /fb

SUS-12-022 L=9.20 /fb x = 0.05x = 0.50

x = 0.95

SUS-12-022 L=9.20 /fb

SUS-12-028 L=11.70 /fb

SUS-12-028 L=11.70 /fb

SUS-13-007 SUS-13-008 L=19.40 19.50 /fbSUS-12-024 SUS-12-028 L=19.40 11.70 /fb

SUS-12-001 L=4.93 /fb

SUS-12-028 L=11.70 /fb

SUS-12-005 SUS-11-024 L=4.70 /fb

SUS-13-008 SUS-12-017 L=19.50 10.50 /fb

SUS-12-005 SUS-11-024 L=4.70 /fb

SUS-12-004 L=4.98 /fb

SUS-12-022 L=9.20 /fb

SUS-11-011 L=4.98 /fb

SUS-13-008 L=19.50 /fb

SUS-13-011 L=19.50 /fb left-handed topunpolarized top

right-handed top

SUS-11-024 SUS-12-005 L=4.70 /fb

SUS-11-021 SUS-12-002 L=4.98 4.73 /fb x = 0.25x = 0.50

x = 0.75

SUS-12-022 L=9.20 /fb x = 0.05x = 0.50

x = 0.95

SUS-12-010 L=4.98 /fb x = 0.25x = 0.50

x = 0.75

SUS-12-022 L=9.20 /fb

SUS-11-030 L=4.98 /fb

glui

no p

rodu

ctio

nsq

uark

stop

sbot

tom

EWK

gaug

inos

slep

ton

Summary of CMS SUSY Results* in SMS framework

CMS Preliminary

m(mother)-m(LSP)=200 GeV m(LSP)=0 GeVLHCP 2013

= 7 TeVs = 8 TeVs

lspm⋅-(1-x)motherm⋅ = xintermediatemFor decays with intermediate mass,

Only a selection of available mass limits*Observed limits, theory uncertainties not included

Probe *up to* the quoted mass limit


Summary

Many recent search results Each requires understanding SM tails (top, Z, Diboson, etc) Extended reach with 8 TeV data gluino to 1.3 TeV

stop to 0.7 TeV ewkinos to 0.5 TeV

Mass scales [GeV]0 200 400 600 800 1000 1200

0χ∼ l → l

~

0χ∼ 0


0χ∼

0χ∼ 0

χ∼ W Z → 2

0χ∼ ±χ∼

0χ∼

0χ∼νν

-l+ l→ -χ∼+χ∼ 0


2

0χ∼

0χ∼ 0


0χ∼

0χ∼ bZ → b

~0χ∼ tW → b

~0χ∼ b → b

~

)0χ∼ W → +χ∼ b(→ t~

)0χ∼ W→ +χ∼ b(→ t~

0χ∼ t → t~

0χ∼ t → t~

0χ∼ q → q~

0χ∼ q → q~

0χ∼ btW→ g~

)0χ∼γ →

2

0χ∼ qq(→ g~

)0χ∼ W→

±χ∼|0

χ∼γ→2

0χ∼ qq(→ g~

)0χ∼ Z →

2

0χ∼ qq (→ g~

)0χ∼ ν± l→ ±χ∼ qq(→ g~

)0χ∼ t→ t~ t(→ g~

)0χ∼ |0

χ∼ W→±χ∼ qq(→ g~)0

χ∼ |0χ∼ τ τ →2χ∼ qq(→ g~

)0χ∼

-l+ l→2

0χ∼ qq (→ g~

0χ∼ tt → g~

0χ∼ bb → g~

0χ∼ qq → g~

0χ∼ qq → g~

SUS-12-022 L=9.20 /fb

SUS-13-008 L=19.50 /fb

SUS-13-011 L=19.50 /fb x = 0.25x = 0.50

x = 0.75

SUS-13-008 L=19.50 /fb

SUS-12-001 L=4.93 /fb

SUS-11-010 L=4.98 /fb

SUS-12-022 L=9.20 /fb x = 0.05x = 0.50

x = 0.95

SUS-12-022 L=9.20 /fb

SUS-12-028 L=11.70 /fb

SUS-12-028 L=11.70 /fb


SUS-12-001 L=4.93 /fb

SUS-12-028 L=11.70 /fb

SUS-12-005 SUS-11-024 L=4.70 /fb

SUS-13-008 SUS-12-017 L=19.50 10.50 /fb

SUS-12-005 SUS-11-024 L=4.70 /fb

SUS-12-004 L=4.98 /fb

SUS-12-022 L=9.20 /fb

SUS-11-011 L=4.98 /fb

SUS-13-008 L=19.50 /fb


right-handed top

SUS-11-024 SUS-12-005 L=4.70 /fb

SUS-11-021 SUS-12-002 L=4.98 4.73 /fb x = 0.25x = 0.50

x = 0.75

SUS-12-022 L=9.20 /fb x = 0.05x = 0.50

x = 0.95

SUS-12-010 L=4.98 /fb x = 0.25x = 0.50

x = 0.75

SUS-12-022 L=9.20 /fb

SUS-11-030 L=4.98 /fb

glui

no p

rodu

ctio

nsq

uark

stop

sbot

tom

EWK

gaug

inos

slep

ton


CMS Preliminary


= 7 TeVs = 8 TeVs





Summary

Many recent search results Each requires understanding SM tails (top, Z, Diboson, etc) Extended reach with 8 TeV data gluino to 1.3 TeV

stop to 0.7 TeV ewkinos to 0.5 TeV w/ important caveats; limits degrade for compressed spectra, e.g., high mLSP or mLSP≈mChargino

Mass scales [GeV]0 200 400 600 800 1000 1200

0χ∼ l → l

~

0χ∼ 0


0χ∼

0χ∼ 0

χ∼ W Z → 2

0χ∼ ±χ∼

0χ∼

0χ∼νν

-l+ l→ -χ∼+χ∼ 0


2

0χ∼

0χ∼ 0


0χ∼

0χ∼ bZ → b

~0χ∼ tW → b

~0χ∼ b → b

~

)0χ∼ W → +χ∼ b(→ t~

)0χ∼ W→ +χ∼ b(→ t~

0χ∼ t → t~

0χ∼ t → t~

0χ∼ q → q~

0χ∼ q → q~

0χ∼ btW→ g~

)0χ∼γ →

2

0χ∼ qq(→ g~

)0χ∼ W→

±χ∼|0

χ∼γ→2

0χ∼ qq(→ g~

)0χ∼ Z →

2

0χ∼ qq (→ g~

)0χ∼ ν± l→ ±χ∼ qq(→ g~

)0χ∼ t→ t~ t(→ g~

)0χ∼ |0

χ∼ W→±χ∼ qq(→ g~)0

χ∼ |0χ∼ τ τ →2χ∼ qq(→ g~

)0χ∼

-l+ l→2

0χ∼ qq (→ g~

0χ∼ tt → g~

0χ∼ bb → g~

0χ∼ qq → g~

0χ∼ qq → g~

SUS-12-022 L=9.20 /fb

SUS-13-008 L=19.50 /fb

SUS-13-011 L=19.50 /fb x = 0.25x = 0.50

x = 0.75

SUS-13-008 L=19.50 /fb

SUS-12-001 L=4.93 /fb

SUS-11-010 L=4.98 /fb

SUS-12-022 L=9.20 /fb x = 0.05x = 0.50

x = 0.95

SUS-12-022 L=9.20 /fb

SUS-12-028 L=11.70 /fb

SUS-12-028 L=11.70 /fb


SUS-12-001 L=4.93 /fb

SUS-12-028 L=11.70 /fb

SUS-12-005 SUS-11-024 L=4.70 /fb

SUS-13-008 SUS-12-017 L=19.50 10.50 /fb

SUS-12-005 SUS-11-024 L=4.70 /fb

SUS-12-004 L=4.98 /fb

SUS-12-022 L=9.20 /fb

SUS-11-011 L=4.98 /fb

SUS-13-008 L=19.50 /fb


right-handed top

SUS-11-024 SUS-12-005 L=4.70 /fb

SUS-11-021 SUS-12-002 L=4.98 4.73 /fb x = 0.25x = 0.50

x = 0.75

SUS-12-022 L=9.20 /fb x = 0.05x = 0.50

x = 0.95

SUS-12-010 L=4.98 /fb x = 0.25x = 0.50

x = 0.75

SUS-12-022 L=9.20 /fb

SUS-11-030 L=4.98 /fb

glui

no p

rodu

ctio

nsq

uark

stop

sbot

tom

EWK

gaug

inos

slep

ton


CMS Preliminary


= 7 TeVs = 8 TeVs





More to come; we are not done.

More 8 TeV analysis to target compressed spectra ⇒ “Parked” data Doubling the energy will quickly extend the reach.


SUSY around the corner or in a corner?

Super

Com

pres

sed

Spec

tra w

/ 8 T

eV

13 o

r 14

TeV

8 TeV

Documents

David Stuart , UC Santa Barbara Rencontres de Blois, May 2013stuart.physics.ucsb.edu/Presentations/Stuart_Blois.pdfSUSY searches, David Stuart, UCSB 4! With 20/fb of LHC lumi, would