Status and 13(14) TeV Prospects on BSM physics at the...
Transcript of Status and 13(14) TeV Prospects on BSM physics at the...
![Page 1: Status and 13(14) TeV Prospects on BSM physics at the LHChome.kias.re.kr/psec/Pheno3/LHC-BSM-2013KIAS... · 2013. 11. 13. · Prospects on BSM physics at the LHC DongHeeKim KyungpookNational](https://reader035.fdocuments.in/reader035/viewer/2022081623/6147dd79a830d0442101b653/html5/thumbnails/1.jpg)
Status and 13(14) TeV
Prospects on BSM physics
at the LHC
DongHee KimKyungpook National University
2013 KIAS Phenomenology WorkshopNov 12, 2013
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7(8) TeV ResultsSUSY, a single Lepton and dilepton and aGC
Physics Potential at 13(14) TeVSUSY, new gauge bosons, extra-dimensions and aGC
CONTENTS
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SUSY particles
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SUSY particles
■ SUSY may be next candidates for Nature after Higgs discovery- Large corrections to the Higgs boson mass- Dark matter - Unification of gauge coupling constants
■ SUSY search categories dramatically changed after Higgs- Natural SUSY
- 3rd generation scalar quarks being very important !- Electroweak production
- Inclusive searches for squarks and gluinos (conventional searches)
- gluino / squark pair producion
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Search from Natural SUSY scenarios
■ 3rd generation scalar quark
Direct b/t pair production~ ~Gluino-mediated b/t production~ ~
- Direct stop production has a small cross section
- Events resemble that of top-pair production
Jets + MET + btag
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6/53DongHee Kim
Search from Natural SUSY scenarios
■ Electroweak neutralino, chargino, slepton pair production
Multi-leptons + MET
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Gluino-mediated stop/sbottom production
ATLAS references (8 TeV): ATLAS-CONF-2012-061, ATLAS-CONF-2012-103, ATLAS-CONF-2012-145, ATLAS-CONF-2012-151, ATLAS-CONF-2013-007
ATLAS references (8 TeV): ATLAS-CONF-2012-061, ATLAS-CONF-2012-103, ATLAS-CONF-2012-145, ATLAS-CONF-2012-151, ATLAS-CONF-2013-007
CM
S PA
S-SU
S-13
-007
CMS references (8 TeV): 1305.2390, PAS-SUS-13-008, PAS-SUS-13-007, PAS-SUS-12-026, 1303.2985, 1212.6194
CMS references (8 TeV): 1305.2390, PAS-SUS-13-008, PAS-SUS-13-007, PAS-SUS-12-026, 1303.2985, 1212.6194
ATL
AS-
CO
NF-
2012
-3b
ATL
AS-
CO
NF-
2012
-061
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8/53DongHee Kim
Gluino-mediated stop/sbottom production
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
Observed
Expected
m(glui
no) -
m(L
SP) = 2
m(top)
LHCP 2013 = 8 TeVs
CMS Preliminary10 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
Depending on LSP mass, gluino masses between ~650 and ~1350 GeVexcluded by ATLAS and CMS
[GeV]g~m600 700 800 900 1000 1100 1200 1300 1400 1500 1600
[GeV
]10
m
200
400
600
800
1000
1200
forbidden
10t tg~
= 8 TeVs), g~) >> m(q~, m(1
0t tg~ production, g~g~ Lepton & Photon 2013
ATLASPreliminary
ExpectedObservedExpectedObservedExpectedObservedExpectedObserved
10 jets0-lepton, 7 -
3 b-jets0-1 lepton,
4 jets3-leptons,
3 b-jets2-SS-leptons, 0 -
ATLAS-CONF-2013-054
ATLAS-CONF-2013-061
ATLAS-CONF-2012-151
ATLAS-CONF-2013-007
]-1 = 20.3 fbint
[L
]-1 = 20.1 fbint
[L
]-1 = 12.8 fbint
[L
]-1 = 20.7 fbint
[L
not included.theorySUSY95% CL limits.
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Direct stop production : stop t + LSP
0 lepton + 6 (2b)-jets + MET [ATLAS]
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
CMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985CMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985
~660 GeV for stop mass and ~ 250 GeV excluded for LSP
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Search for Natural SUSY scenarios
■ Direct stop production : stop b + charginoCMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985CMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
1 lepton + 4 (1b) jets + MET [ATLAS + CMS]
Flexible signature sensitive to all stop decays. Strong optimization by CMS (BDT) and ATLAS (shape)
2 leptons (+ jets) + MET [ATLAS]
Analysis mainly targets t1 b ±. Complements bb+MET analysis for large m( ±,0)
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Direct stop production : stop b + chargino
Exclusion of stop mass < ~660 GeV for massless LSP; exclusion up to ~ 280 GeV
CMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985CMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985
CM
S: P
AS-
SUS-
13-0
11
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
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Direct charginos , neutralinos production
CMS references (8 TeV): PAS-SUS-12-022CMS references (8 TeV): PAS-SUS-12-022
~650 GeV for chargino(neutralino) and ~ 300 GeV excluded for LSP
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Inclusive search for Squark and gluino production
■ jets + X + ETmiss channel : Neutralino LSP ( MET )
ATL
AS-
CO
NF-
2013
-047
ATLAS references (8 TeV): ATLAS-CONF-2013-062, ATLAS-CONF-2013-054, ATLAS-CONF-2013-047, ATLAS-CONF-2013-007, ATLAS-CONF-2012-152
ATLAS references (8 TeV): ATLAS-CONF-2013-062, ATLAS-CONF-2013-054, ATLAS-CONF-2013-047, ATLAS-CONF-2013-007, ATLAS-CONF-2012-152
Limits in “Higgs-aware” MSUGRA/CMSSM plane
Gluino masses below ~1.4 TeV excluded for any squark mass
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Inclusive search for Squark and gluino production
■ jets + X + ETmiss channel : Gravitino LSP ( MET )
GMSB model with tau/photon channel Tau NLSP: production of taus + jets + MET
ATL
AS-
CO
NF-
2013
-026
Bino NLSP: prod. of photons + jets + MET
m( g) 1.2
low-tan
1.5large-tan
TeV
m( q) 1.2 TeV m( g) 1.1 TeV
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Inclusive search for Squark and gluino production
■ jets + X + ETmiss channel : Gravitino LSP ( MET )
GMSB model with long lived particle(LLP)ATLAS reference (8 TeV): ATLAS-CONF-2013-058ATLAS reference (8 TeV): ATLAS-CONF-2013-058 CMS reference (8 TeV): 1305.0491CMS reference (8 TeV): 1305.0491
Long lived stau
Long lived stau Long lived gluino
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New Gauge Bosons and Extra Dimensions
■ a Single Lepton channel
- Charged new gauge bosons, W’
- Split-UED interpretations, KK-W’ boson
- Contact Interactions and excited chiral bosons etc.
■ Dilepton channel
- Z’ particles and more related
- RS gravitons and LED particles
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A Single Lepton + MET
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A Single Lepton : Event Selection
Signature : (W-like) 1 lepton + 1 neutrino• One isolated lepton (electron or muon)• Ele. ET > 100 GeV (CMS), > 85 GeV (ATLAS)• Large Missing Transverse Energy • Kinematic : back-to-back decay
Observable : transverse mass
• 2 1 cos
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SSM W’ Limits : e and μ combined
SSM W’ limit in CMS
• Obs. Limit MW’ > 3.35 TeV
• Exp. Limit MW’ > 3.40 TeV
• SSM W’ in ATLAS
• W* (Chiral boson excitation) in ATLAS
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SSM W’ : W-W’ interference
Opposite sign scenario (SSMO)
• Couplings are 1 for leptons and -1 for quarks
• Constructive interference
Same Sign scenario (SSMS)
• Couplings are 1 for leptons and quarks
• Destructive interference
3.7 TeV3.1 TeV
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Split Universal Extra Dimensions
• Assuming additional compact space dimension with radius R.
• Two free parameters : 1/R and bulk(μ) (n =2 excitation mode considered)
• Cross-Sections are calculated by Pythia with Couplings(Fn) between 0~ 2
• Event signature like SSM W’
• 2-Dim. limits are set (1/R and μ)~3.8 TeV
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Helicity-Non-Conserving Contact Interaction
Quarks and leptons composed of fundamental
sub-particles
Events signature like SSM W’
• lepton and neutrino, back-to-back
Cross section : σ ∝ Λ-4
Limits are set on Λ (binding energy)
~12.5 TeV
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Evolution of SSM W’ Mass Limit
1.12 TeVFeb 2011
3.35 TeVMar 2013
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Di-Lepton
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Di-lepton Event Selection
Event Selection• Single (double) muon (electrons) trigger• 2 same flavor isolated leptons
Backgrounds• Drell-Yan, ttbar, Diboson in MC• QCD mutijets and W+jets in data
■ Mass spectrum
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Limits on SSM/E6/RS model : ee and μμ combined
■ Mass Limits(TeV) with 20/fb@8TeV
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Large Extra Dimension : ADD model■ Address hierarchy problem, effective Plank scale lowered to O(TeV)■ Reduced Planck scale in 4+n dim. :
■ Virtual KK graviton exchange, continuous spectrum of KK states Dilepton, diphoton final states, broad excess over SM
■ Evolution of MS limits
■ Limits on MS (CMS 20/fb@8TeV)
■ Limits on MS (ATLAS 5/fb@7TeV)
■ Parameterized by
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Z’B-L model : MC simulation
■ A U(1) extension of the SM :• One extra fermion per generation : naturally included• U(1)B-L symmetry breaking : extra Z’ boson• Covariant derivative : • No Z-Z’ mixing with , parameter space : and
• Discovery potentials at 14 TeV collisions
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anomalous Gauge Couplings
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30/53DongHee Kim
Anomalous Gauge Couplings
• Triple gauge boson couplings (TGCs):- charged TGC : WWZ, WW : allowed in SM- neutral TGC : ZZZ, ZZ, Z: forbidden in SM
• anomalous gauge couplings (aTGCs, aQGCs)
- aTGCs/aQGCs can enhance total production rate and modify kinematic distribution.
- LHC will provide the most sensitive tests on a aGC due to much higher energies - compared to Tevatron and LEP
• Quartic gauge boson couplings (QGCs):- charged QGC : WWZ, WW ,WWZZ, WWWW : allowed in SM- neutral QGC : ZZ,ZZZZ : forbidden in SM
Look for aTGC and aQGC for new Physics
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Charged TGC
Neutral TGC
Vertex channels couplings
WW, WW, W
WWZ, WW, WZ
ZZ Z
Z Z
ZZ ZZ
ZZZ ZZ
54 , ff
ZZ hh 43 ,43 ,hh
ZZ ff 54 ,
,Z
ZZ 1,, g
aTGC through the measurements of diboson production
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Limits on Charged aTGC
Vertex : WW
W lCMS ATLAS
Data 5 fb-1 @7TeV 4.6 fb-1 @7TeV
[-0.38, 0.29] [-0.41, 0.46]
[-0.050, 0.037] [-0.065, 0.061]
Vertex : WW & WWZ
CMS ATLAS
Data 5 fb-1 @7TeV 4.6 fb-1 @7TeV
Z - [-0.078, 0.092]
Z [-0.048, 0.048] [-0.074, 0.073]
- [-0.152, 0.146]
g1Z [-0.095, 0.092] [-0.373, 0.562]
[-0.21, 0.22] [-0.135, 0.190]
WW ll
CMS : Z=g1Z-tan2(W), = Z
Vertex : WWZ
WZ ljjCMS ATLAS
Data 5 fb-1 @7TeV 4.6 fb-1 @7TeV
g1Z g1
Z = 0 [-0.057, 0.093]
Z [-0.050, 0.037] [-0.37, 0.57]
Z [-0.038, 0.030] [-0.046, 0.047]
Exclusive (Njet=0)Inclusive (Njet>0)
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Limits on Neutral aTGC couplings
Zll ()
Vertex : ZZ & Z
CMS ATLAS
Data 5 fb-1 @7TeV 4.6 fb-1 @7TeV
h3102 [-0.32, 0.32] [-1.5, 1.6]
h3Z102 [-0.31, 0.31] [-1.3, 1.4]
h4105 [-1.6, 1.6] [-9.4, 9.2]
h4Z105 [-1.4, 1.4] [-8.7, 8.7]
ZZ 4l (ll)Vertex : ZZZ & ZZ
CMS ATLAS
Data 19.6 fb-1 @8TeV 4.6 fb-1 @7TeV
f4Z [-0.004, 0.004] [-0.019, 0.019]
f4 [-0.004, 0.004] [-0.022, 0.023]
f5Z [-0.005, 0.005] [-0.020, 0.019]
f5 [-0.005, 0.005] [-0.016, 0.015]
Exclusive (Njet=0)Inclusive (Njet>0)
Binning effects and form factor Improve by ~ factor 5
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34/53DongHee Kim
Limits on WW aTGC couplings Limits on WWZ aTGC couplings
Limits on neutral a TGC Z and ZZ Limits on neutral a TGC ZZ and ZZZ
Summary of Limits on aTGC
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35/53DongHee Kim
Limits on aQGC
Vertex : WW & ZWW
WVljj(V=Z,W)
ppp*WWp* Vertex : WW
First search with LHC data !
Up to date, CMS has aQGC results
limits on aQGC( WW ): ~ two orders of magnitude more stringent than LEP limits
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36/53DongHee Kim
CMS + ATLAS Gauge Coupling Summary
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37/53DongHee Kim
Lots Physics below
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Physics Potential @ 13(14) TeV
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39/53DongHee Kim
Toward 13(14) TeV (& with High-Luminosity) !
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40/53DongHee Kim
Milestone of the LHC
■ LHC- Reach design lumi by LS2- A series of Phase I upgrade is
being planned towards LS2- Collect 300 fb-1 by 2022- The inner and forward parts of
the detector will cease function due to radiation damage.
■ HL-LHC- Expecting 3000fb-1
- Expecting ~140 pileup - Phase II upgrade aims to achieve
HL-LHC goals.
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41/53DongHee Kim
New Particle Discovery Potential
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42/53DongHee Kim
SUSY cross sections at 14 TeV and Simulations
■ Delphes- Fast detector simulation- Detector configuration and response are parameterized- Pileup simulation is supported
■ Trigger- Similar triggers as 8 TeV analysis are assumed .
■ This analysis is using CMS detector configuration.
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43/53DongHee Kim
Neutralino /Chargino search
■ 5σ discovery of charginoand neutralino masses are ~ 700 GeV and LSP mass ~200 GeV
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44/53DongHee Kim
Gluino Search
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45/53DongHee Kim
Squark and EWKino Searches
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46/53DongHee Kim
Heavy Gauge Bosons
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47/53DongHee Kim
Single Lepton
W’ l + MET MC study• Background : high pThat SM W• ~65% efficiencies• Discovery up to ~ 6 TeV (3000/fb)• Exclude up to ~ 6.5 TeV (3000/fb)
Expected Mt : background and signal
Exclusion Potential
Discovery Potential
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48/53DongHee Kim
Di-lepton
Exclusion Potential Z’ ll MC study• Efficiencies from 8 TeV analysis• Electron : smearing as in 8 TeV• Muon : smearing as in 8 TeV
Discovery Potential
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49/53DongHee Kim
aQGC prospect @ 13/14 TeV
channel Parameter Significance(5)
300fb-1 3000fb-1
VBS ZZ 4l CW/2 [TeV-2] 34 16
VBS WW ll fS0/4 [TeV-4] 10 4.5
Z production fT8/4 [TeV-4] 0.9 0.4
fT9/4 [TeV-4] 2.0 0.7
VBS WZ lll fT1/4 [TeV-4] 1.3 0.6
VBS WZ lll fT1/4 [TeV-4] 1.0 0.55
Sensitivities for aQGC discovery (14 TeV)
ATLAS
CMS
Sensitivity studies on various VBS channels are undergoing
aQGC has sensitivities together with aTGC. Vector boson scattering (VBS): VVVV provides insight into EWSB mechanism VBS measurements just started with LHC data
Set limits on aQGCs by cross-section measurements
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50/53DongHee Kim
13/14 TeV Preparations(example)
There are lots of tasks going on by major teams before turning the 13 TeV machine on
All kinds of simulations and calculations are on their way in advance
Computing requirement for k-factor calculation as an example
• 1 mass points : 1 day using 154 CPUs about two months for one energy scan !
• Therefore it need to be done in advance due to lots other tasks ahead !
• Tier-3 computing power is very important !
K-factor calculation
(hour)
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Summary
Most important era for new physics for the next decade !
Discovery of the Higgs gives a big impact to the future LHC detectors must remain sensitive to EWK-scale physics While maximizing sensitivities to new physics
LHC upgrade present several challenges Trigger and pile-up and radiation hardness Both ATLAS and CMS upgrade are being designed to deal with
Projected Physics Reach SUSY and Exotic particle discovery potential ranging from 0.6 to 7 TeV
doubling the previous searches Anomalous gauge couplings are on the edge of testing Higgs couplings to ~ 5% measurements or better
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52/53DongHee Kim
■ BACKUP
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53/53DongHee Kim
Direct stop decay via RPV
CMS references (8 TeV): PAS-SUS-13-003, PAS-SUS-12-027, PAS-SUS-12-026CMS references (8 TeV): PAS-SUS-13-003, PAS-SUS-12-027, PAS-SUS-12-026
• Search for 3,4 leptons (incl. 0,1 t ) and a b-jet, Z-veto, exploiting bins in effective mass (ST)
• Depending on non-zero RPV coupling of the LSP, strong limits onstop pair production obtained
Signal regions with different lepton flavours sensitive to different RPV couplings
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54/53DongHee Kim
Direct stop production : stop t + LSP
CMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985CMS references (8 TeV): PAS-SUS-13-011, PAS-SUS-13-003, 1303.2985
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
ATLAS references (8 TeV): ATLAS-CONF-2013-053, ATLAS-CONF-2013-048, ATLAS-CONF-2013-037, ATLAS-CONF-025, ATLAS-CONF-2013-024
~660 GeV for stop mass and ~ 250 GeV excluded for LSP