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
SUSY searches, David Stuart, UCSB " 2!
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.
SUSY searches, David Stuart, UCSB " 3!
Rich phenomenology with many signatures of “s-particle” production & decay
SUSY searches, David Stuart, UCSB " 4!
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]
SUSY searches, David Stuart, UCSB " 5!
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
SUSY searches, David Stuart, UCSB " 6!
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
SUSY searches, David Stuart, UCSB " 7!
I will focus on stop, gluino and ewkino searches
Papucci, Ruderman, Weiler, arXiv:1110.6926
≈ 1.5 TeV
≈ 0.5 TeV
≈ 0.2 TeV
!mH2 = H
H
SUSY searches, David Stuart, UCSB " 8!
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
SUSY searches, David Stuart, UCSB " 9!
Top squark (aka “stop”) searches
P1
P2
t̃∗
t̃χ̃−
W−
χ̃+
W+
b̄
χ̃01
χ̃01
b
P1
P2
t̃∗
t̃χ̃−
W−
χ̃+
W+
b̄
χ̃01
χ̃01
b
SUSY searches, David Stuart, UCSB " 10!
Top squark (aka “stop”) searches
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
SUSY searches, David Stuart, UCSB " 11!
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
SUSY searches, David Stuart, UCSB " 12!
1-lepton stop searches: dominant background is top quark tails
“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
SUSY searches, David Stuart, UCSB " 13!
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
1-lepton stop searches: dominant background is top quark tails
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
SUSY searches, David Stuart, UCSB " 14!
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
SUSY searches, David Stuart, UCSB " 15!
stop → top LSP
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
/ τ
stop → b Chargino
SUSY searches, David Stuart, UCSB " 16!
stop → top LSP
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
Signal Bkgnd
stop → b Chargino
SUSY searches, David Stuart, UCSB " 17!
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~
-1Ldt = 19.5 fb∫ = 8 TeV, sCMS Preliminary
Dat
a/M
C
00.5
11.5
2
ATLAS-CONF-2013-037 CMS-SUS-13-011 MET MT
1 10
10
1
SUSY searches, David Stuart, UCSB " 18!
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
SUSY searches, David Stuart, UCSB " 19!
1-lepton stop searches: limits for stop → top LSP
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
SUSY searches, David Stuart, UCSB " 20!
1-lepton stop searches: limits for stop → top LSP
[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
-1Ldt = 19.5 fb∫ = 8 TeV, sCMS Preliminary
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
SUSY searches, David Stuart, UCSB " 21!
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
σ1±Observed ()σ1±Expected (
)-1Observed (9.7 fb
01χ∼
+ 0.25 mt~ = 0.75 m±
1χ∼
m
-1Ldt = 19.5 fb∫ = 8 TeV, sCMS Preliminary
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
σ1±Observed ()σ1±Expected (
01χ∼
+ 0.75 mt~ = 0.25 m±
1χ∼
m
-1Ldt = 19.5 fb∫ = 8 TeV, sCMS Preliminary
W = m
01χ∼
- m±1χ∼m
22!
1-lepton stop searches: limits for stop → b chargino
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 " 23!
1-lepton stop searches: limits for stop → b chargino
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
SUSY searches, David Stuart, UCSB " 24!
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
-
2L ATLAS-CONF-2013-048
0L ATLAS-CONF-2013-053
-
1L ATLAS-CONF-2013-037
2L ATLAS-CONF-2013-048
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
SUSY searches, David Stuart, UCSB " 25!
I will focus on stop, gluino and ewkino searches
Papucci, Ruderman, Weiler, arXiv:1110.6926
!mH2 = H
H ≈ 1.5 TeV
≈ 0.5 TeV
≈ 0.2 TeV
SUSY searches, David Stuart, UCSB " 26!
Gluino searches
SUSY searches, David Stuart, UCSB " 27!
Gluino searches
SUSY searches, David Stuart, UCSB " 28!
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 &
SUSY searches, David Stuart, UCSB " 30!
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 &
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!
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 &
SUSY searches, David Stuart, UCSB " 32!
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
SUSY searches, David Stuart, UCSB " 33!
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
SUSY searches, David Stuart, UCSB " 34!
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
SUSY searches, David Stuart, UCSB " 35!
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
SUSY searches, David Stuart, UCSB " 36!
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
SUSY searches, David Stuart, UCSB " 38!
Gluino searches: same-sign dileptons
Search in regions of Nb, MET, MT & mll
ATLAS-CONF-2013-007
Njet Nb
Charge mis-id (yellow) is only dominant at low Nb. Then fakes…
SUSY searches, David Stuart, UCSB " 39!
Gluino searches: multileptons
At large meff,
Search in regions of Nb, MET, MT & mll
ATLAS-CONF-2013-007
meff
Rare SM backgrounds, like ttW and ttZ become important.
SUSY searches, David Stuart, UCSB " 40!
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
SUSY searches, David Stuart, UCSB " 41!
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 (
SUSY searches, David Stuart, UCSB " 42!
I will focus on stop, gluino and ewkino searches
Papucci, Ruderman, Weiler, arXiv:1110.6926
!mH2 = H
H ≈ 1.5 TeV
≈ 0.5 TeV
≈ 0.2 TeV
SUSY searches, David Stuart, UCSB " 43!
EWKino searches with trileptons
SUSY searches, David Stuart, UCSB " 44!
EWKino searches with trileptons
SUSY searches, David Stuart, UCSB " 45!
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.
SUSY searches, David Stuart, UCSB " 46!
EWKino searches with multileptons
Handles are: dilepton mass, MT, MET & Nb.
ATLAS-CONF-2013-035
MET
On-Z
SUSY searches, David Stuart, UCSB " 47!
EWKino searches with multileptons
Handles are: dilepton mass, MT, MET & Nb.
ATLAS-CONF-2013-035
MET
10
1 On-Z
SUSY searches, David Stuart, UCSB " 48!
EWKino searches with multileptons
Handles are: dilepton mass, MT, MET & Nb.
ATLAS-CONF-2013-035
MT
10
1 On-Z
SUSY searches, David Stuart, UCSB " 49!
EWKino searches with trileptons ATLAS-CONF-2013-035
Chargino/Neutralino mass→
LSP
mas
s→
SUSY searches, David Stuart, UCSB " 50!
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→
SUSY searches, David Stuart, UCSB " 51!
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
SUSY searches, David Stuart, UCSB " 52!
EWKino searches with dileptons ATLAS-CONF-2013-049
SUSY searches, David Stuart, UCSB " 53!
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
SUSY searches, David Stuart, UCSB " 54!
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
SUSY searches, David Stuart, UCSB " 55!
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
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
SUSY searches, David Stuart, UCSB " 56!
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
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
SUSY searches, David Stuart, UCSB " 57!
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 searches, David Stuart, UCSB " 58!
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
Top Related