PHYSICS BEYOND THE STANDARD MODEL IN ATLAS AND CMS
Judita Mamužić on behalf of ATLAS and CMS collaborations IFIC / CSIC - University of Valencia
X CPAN DAYS, Salamanca, 29-31 October 2018
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS 2
pp
500µb 1 80µb 1
W Z t¯t t
t-chan
WW H
total
t¯tH VBF VH
Wt
2.0 fb 1
WZ ZZ t
s-chan
t¯tW t¯tZ tZj 10 1
1 101 102 103 104 105 106 1011
[pb]
Status: July 2018
ATLAS Preliminary Run 1,2 p
s = 7,8,13 TeV
Theory LHC pp p
s= 7TeV Data 4.5 4.6fb 1 LHC pp p
s= 8TeV
Data 20.2 20.3fb 1 LHC pp p
s= 13TeV Data 3.2 79.8fb 1
Standard Model Total Production Cross Section Measurements
Good agreement of Standard Model (SM) theory prediction and experimental measurements.
• This talk includes recent results from ATLAS and CMS in physics Beyond the Standard Model (BSM) in “direct” searches (number of SM measurements have BSM interpretation - not covered here).
• Topics: Exotics (BSM Higgs), Dark Matter, Supersymmetry
• The selection of results is a personal choice, with emphasis on contributions from Spanish groups.
SummaryPlotsSMATLAS
A number of phenomena cannot be explained by the SM, and new theories are set in place.
1 PHYSICS BEYOND THE STANDARD MODEL
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
1.1 ATLAS AND CMS
3
LuminosityPublicResultsRun2ATLAS LumiPublicResultsCMS
• ATLAS and CMS are multi purpose detectors.
• Hermetic and onion like design.
• Sensitivity to a large number of physics scenarios.
• Results obtained using 13 TeV Run 2 data, collected in 2015, 2016 and 2017, with 13-38
mean number of interactions per bunch crossing.
JUDITA MAMUZIC PHYSICS BSM IN ATLAS AND CMS
1.2 IMPROVEMENTS IN NEW ANALYSES
4
New models and analyses strategies
• Multi-bin fits with large number of search regions (sensitivity to wide range of
models)
• New models (searches for compressed regions, in precision measurements of Higgs couplings, BF, cross-sections)
• New final states (use Higgs boson decays)
Taggers for complicated objects
• Double b-tagging, charm jets, top tagging, Boosted W/Z/H, jet substructure
• Usage of machine learning (ML) techniques
Improved object reconstruction
• b-tagging
• Tau tagging
• Overlap removal
• Pileup mitigation Double b-tagging
ATL-PHYS-PUB-2017-010
174 search regions
JETM-2017-011
Pileup mitigation
Phys. Rev. D 96 (2017) 032003
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
2 EXOTICS
5
• Signature-driven searches.
• Covers a wide range of models.
• High diversity in analyses techniques.
• A subset of analyses will be discussed here:
• Heavy resonances
• Vector-like quarks
• Leptoquarks
• In separate sections:
• Higgs and BSM
• Dark matter
• Long-lived particles
Courtesy Daniel Hayden
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
2.1 EXOTICS: HEAVY RESONANCES
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• Very general search, number of interpretations.
• Typical analysis is a “bump hunt”
• Probes mass scales up to accelerator limit (multi TeV scale).
• Number of BSM theories predict a heavy resonance: Z’, W’.
• Decay modes:
• Classical: di-jet, di-lepton
• New: ttbar, VV, γW/Z/H
q
q
m
No. events
Signal Bac
kgrou
nd “bump hunt”
High mass di-jet
• Generic search for new physics with strong interaction.
• Probes resonances directly produced in a collision.
• Low mass range up to jet trigger threshold.
• Data-driven background estimate.
• Search for an excess using BumpHunter.
• Results interpreted in a number of models, Quantum black hole, W’, W*, Excited quark, Z’, Contact interaction, and hypothetical signal with a cross-section σG that produces a Gaussian contribution to the particle-level mjj distribution.
Phys. Rev. D 96 (2017) 0520042016
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
2.1 EXOTICS: HEAVY RESONANCES
7
Di-jet trigger-level
• Search for di-jet resonances in the sub-TeV range.
• Di-jet resonances at low transverse momentum are produced at much lower rate than the SM multijet production.
• Inclusive single-jet triggers have a large bandwidth, so di-jet triggers are statistically limited.
• Record only event information calculated by the jet trigger algorithms, allow higher rates (1%) and reduces storage (5%).
• Using dedicated jet calibration for online jets.
• Uses data-driven background estimation, and BumpHunter in the search for an excess.
Phys. Rev. Lett. 121 (2018) 081801
2015+2016
• Search for a X(G)→Z(ll)Z(jj) and X(W’)→W(jj)Z(ll) resonance.
• Two categories for reconstruction of hadronically decaying V
2leptons+2jets
JHEP 09 (2018) 1012016
Merged for high-mass resonances.
Resolved for low-mass
resonances.
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
l
l
2.1 EXOTICS: HEAVY RESONANCES
8
Di-lepton
JHEP06(2018)120Spin-1 resonance,
narrow width (0.6% of the resonance mass)
• Search for a Z’ → ll resonance.
• Clean signature.
• Results shown for cross-section ratio of Z’ di-lepton production, and measured di-lepton
production via Z in mll range 60 -120 GeV.
• Search for a W’ → lν resonance.
• Discriminating variable (MT).
• e+MET and μ+MET channels.
• Results interpreted in model independent, Sequential
Standard Model (SSM), Universal Extra Dimensions (UED), and
SUSY R-parity violation (RPV).
Lepton+MET
Model-independent
JHEP06(2018)128
2016 2016
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
,l ,l
2.2 EXOTICS: VECTOR-LIKE QUARKS (T/B)
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Vector-like quarks:
• Coloured spin 1/2 fermions.
• Various electric charges:
2/3, 5/3, -1/3, -4/3
• Models favour decays to vector bosons and 3rd
generation quarks (T → tH/
Z, bW and B → bH/Z, tW)
•Boosted topology (jets close to leptons), uses pt- dependent isolation cone.
Uses W/H tagging (uses jet substructure).
VLQ with leptons
JHEP 08 (2018) 177VLQ with b-jets
JHEP 07 (2018) 0892015+2016
• Analysis for large BR(T →tH)
• Uses 0 -1 leptons, H and top tag, Nb, Nt, NH, binned likelihood fit on meff.
arXiv:1808.02343
Tal van Daalen "Searches for vector-like quarks with the ATLAS detector"
•Statistical combination of T and B, with T→Zt/Wb/Ht, B→Zb/Wt/Hb
In preparation:
•Search for
singly produced vector-like-top quarks (Z→νν).
2016
arXiv:1806.10555v1
2015+2016
•Search for singly produced
vector-like-top quarks (Z→ll).
• Sensitivity to higher T masses.
2016
CMS-B2G-17-018
•Search for singly produced vector-like-b quarks.
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
t
t µ
µ
2.3 EXOTICS: LEPTOQUARKS
t10
Eur. Phys. J. C (2017) 77:895
• LHCb reported anomalies in rare b decays.
(4σ) (2.5σ)
• Discrepancy in anomalous magnetic moment of muon aμ (3.5σ).
• Deviations could be explained with lepto-quarks at the TeV scale, with strong 3rd generation couplings.
LQ contribution to b-decay
LQ contribution to aμ
LQ → tμ
LHC: Pablo Martin "Testing B physics anomalies at ATLAS/CMS"
Flavor: Rusa Mandal "Leptoquarks, in view of recent excitements"
CMS-B2G-16-027
• First search for pair produced leptoquarks coupling to top and μ.
• Previous searches considered LQ→tτ and LQ→bν. (Combined result includes all types of LQ coupling to third generation).
• 2 searches: 2-muon (general purpose); 3-lepton, from 2 muons+1 lepton from top decay (allows LQ mass reconstruction).
• No deviation for SM expectation found.
In preparation:
• Study of Lepton Flavor Violation (LFV) of the Higgs boson in H->tau lep (lep=e,mu).
• Previous result in Run1 includes Z→tau lep
… On a similar note
Eur. Phys. J. C 77 (2017) 70
Workshop on high-energy implications of flavor anomalies 22-24 Oct.
2016
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS [GeV]
mA
200 300 400 1000 2000
βtan
1 2 3 4 10 20 30 40
τ τ H/A→
= 13 TeV, 36.1 fb-1
s
JHEP 01 (2018) 055
ν τ
+→ H
= 13 TeV, 36.1 fb-1
s
JHEP 09 (2018) 139
→ tb H+
= 13 TeV, 36.1 fb-1
s
arXiv:1808.03599 [hep-ex]
ν 4l/llν ZZ→ H→
= 13 TeV, 36.1 fb-1
s
Eur. Phys. J. C (2018) 78: 293
→ Zh
→ A gg
= 13 TeV, 36.1 fb-1
s
JHEP 03 (2018) 174
lν lν WW→ H→
= 13 TeV, 36.1 fb-1
s
Eur. Phys. J. C 78 (2018) 24
→ 4b,
→ hh H
τ, /τ γ bb γ →
γ WWγ →
= 8 TeV, 20.3 fb-1
s
Phys. Rev. D92, 092004 (2015)
γ bb γ hh → H→
= 13 TeV, 3.2 fb-1
s
ATLAS-CONF-2016-004 d] , κ κu V, h couplings [κ
= 13 TeV, 36.1 - 79.8 fb-1
s
ATLAS-CONF-2018-031
Preliminary ATLAS
hMSSM, 95% CL limits
October 2018
Observed Expected
3.1 HIGGS AND BSM
11
JHEP01(2018)055
h/A/H and Z’ → ττ
2015+2016Neutral MSSM Higgs boson
• Final state provides high
sensitivity to MSSM models with large tanβ: A/H → ττ, and a
searches for heavy resonances decaying into two taus:
X/Z' → ττ.
2015+2016
Di-Higgs in γγbb
• One of the motivations is to put
constrains on the Higgs-boson self coupling.
• Resonant and non-resonant Higgs boson pair production with γγbb final state.
arXiv:1807.04873
CombinedSummaryPlotsHIGGS
• Sensitive to new heavy particles decaying to two Higgs bosons: X → HH → γγbb as well as deviations from SM self-coupling of the Higgs boson (κλ=λHHH/λSMHHH).
ATLAS-CONF-2018-043
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
3.2 HIGGS AND BSM
12
ATLAS-CONF-2018-049
2015+2016
FCNC
•Search for flavour-
changing neutral current decays of a top quark
t→Hq (q=u,c).
• H→bb
H + → tb
arXiv:1808.035992015+2016
•Search for charged Higgs bosons heavier
than the top quark and decaying via H+→tb.
• Production of a charged H+ in association with t and b quarks, pp→tbH+.
• Using multi-jet final states with one or two electrons or muons.
• Events categorised according to jet
multiplicity and how likely these are to have
originated from
hadronization of a bottom quark.
• Using multivariate techniques for signal separation.
• Upper limits on the t→Hc and t→Hu BR, and |
λ
tcH| and |λ
tuH| couplings.JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
4 DARK MATTER
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Galactic rotation curves
Visible stars (or galactic gas) rotation speeds around the galactic center and their radial distance from it (i.e. galaxy rotation curves), do not fall as the visible matter distribution prediction.
Gravitational lensing
Observed galaxy mass is not sufficient to account for predicted gravitational lensing.
Bullet clusters
Dark matter bypasses the
colliding gas, but is visible by gravitational lensing (blue).
Search strategies:
• Direct: Signal from nuclei interacting with DM.
• Indirect: SM products are detected by telescope.
• Collider: DM produced in collisions.
Indirect (annihilation)
Break it!
Make it!
Collider (production)
Shake it! Direct (scattering)
Dark matter (DM) candidate:
•Dark (only gravitational interaction observed, weakly interacting)
•Massive (cold, non-relativistic)
•Stable (account for thermal relic density)
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
4 DARK MATTER
14
•Assume a new massive mediator which couples DM to SM (mass, coupling).
•Assume no other new physics.
•Large number of ATLAS and CMS searches use simplified models.
Tim Tait 2016
• DM will not interact with any detector components, a typical signature is missing energy in the transverse plane (MET) of the detector.
• To reconstruct large MET, we require large visible recoil, i.e. DM produced in association with visible particles.
ExoticsPublicResultsATLAS
Effective theories Simplified models
•A number of new physics scenarios predict a Dark Matter candidate (arXiv:1507.00966).
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
4.1 DM: MET + X
15
• DM production with initial state radiation (ISR) particle X:
jet, photon, W or Z.
• Signal appears as excess in the MET distribution tail.
• Production cross-section depends on quark-X coupling.
• Analysis uses a selection on particle X, and a veto on other objects, looks into MET distribution.
MET
N o. e ve nt s
Signal +
Background Bac
kgr ou nd
JHEP 01 (2018) 126
2015+2016
MET + jet
• Largest cross-section in MET + X searches for gluon ISR.
• Dominant backgrounds for MET+jet are Z(νν)+jets and W(lν) +jets (shape fit for boson pt/MET in four control regions).
• NLO QCD and NNLO EW corrections used for V+jets processes (arXiv:1705.04664v1).
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
4.2 DM: VISIBLE DECAYS OF THE MEDIATOR
16
m
ffN o. e ve nt s
Signal Bac
kgr ou nd
• Mediator decays back to visible SM particles.
• Signal appears as a localised excess in the di-fermion invariant mass distribution.
• Resonance searches (di-jet and di-lepton) can be interpreted in the DM context.
Di-jet searches interpreted in DM context
CombinedSummaryPlotsEXOTICS
JUDITA MAMUZIC PHYSICS BSM IN ATLAS AND CMS
4.3 DM: DM + HEAVY FLAVOUR, MONO-TOP
17
DM + tt
CMS-EXO-16-049Mono top
•DM produced in association with top quark pair (2L OS).
• Insight into the nature of DM.
• Sensitivity to low mass regime, not
accessible by direct and indirect searches.
• At LHC energies there is no top quark content in protons, and a mono-top final state is a clear
signature of new
physics, and represents an important scenario in DM searches.
• Statistical combination for tt+DM and t+DM SRs.
CMS-PAS-EXO-18-010
Eur. Phys. J. C 78 (2018) 18
2015+2016
• Stringent collider limits for scalar mediators, and stringent for pseudoscalar mediators at low mass.
• Study for DM in association with single-top quark for HL-LHC ATL-PHYS-PUB-2018-024
In preparation:
• Search for DM in association with single-top quark using 2015+2016 data.
In preparation:
• Search for
H→WW + DM
… On a similar note 2016 2016
JUDITA MAMUZIC PHYSICS BSM IN ATLAS AND CMS
4.4 DM: INTERPRETATION
18
Exclusion power of different searches
strongly depends on the model parameters:
• Axial-vector or vector mediator
• Coupling to quarks, leptons and DM.
Comparison of LHC searches to direct detection results (local DM halo
scattering of terrestrial nuclei).
CombinedSummaryEXOTICS SummaryPlotsEXOCMS
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5 SUPERSYMMETRY
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Dark Matter candidate
Supersymmetry offers a Weakly Interacting Massive Particle
(WIMP) candidate, when R-parity is imposed.
Hierarchy problem and Naturalness Divergent radiative corrections to the Higgs mass cancel out if for each
fermionic loop there is a scalar loop.
Gauge couplings unification
New physics can be introduced between the
electroweak and Grand Unified Theory (GUT) scale, which modifies the running of gauge couplings.
• Introduces a new quantum number, R-parity:
• For conserved R-parity, SUSY particles
produced in pairs, lightest SUSY particle is stable (WIMP), long decay chains.
R
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3(B L)+2S•Predicts a new set of SUSY particles, in
addition to SM particles.
JUDITA MAMUZIC SUSY SEARCHES WITH 2 LEPTONS USING STRONG AND HIGGSINO PRODUCTION
5.1 SUSY ANALYSES
20
m
2Z2 = | µ |
2+ m
2H<latexit sha1_base64="+JiPYLii+TcU89p0vHNUNQ5F7nU=">AAACFXicbVDLSsNAFJ34rPUVdelmsAiCWpIi6EYouumygn1gW8NkOmmHziRhZiKUND/hxl9x40IRt4I7/8ZJmoW2Hrhw5px7uXOPGzIqlWV9GwuLS8srq4W14vrG5ta2ubPblEEkMGnggAWi7SJJGPVJQ1HFSDsUBHGXkZY7uk791gMRkgb+rRqHpMfRwKcexUhpyTFPTrueQDjmTnyX3MeVJNEFL+Gky6NJ+obHUHu1zHPMklW2MsB5YuekBHLUHfOr2w9wxImvMENSdmwrVL0YCUUxI0mxG0kSIjxCA9LR1EecyF6cXZXAQ630oRcIXb6Cmfp7IkZcyjF3dSdHaihnvVT8z+tEyrvoxdQPI0V8PF3kRQyqAKYRwT4VBCs21gRhQfVfIR4inZLSQRZ1CPbsyfOkWSnbVtm+OStVr/I4CmAfHIAjYINzUAU1UAcNgMEjeAav4M14Ml6Md+Nj2rpg5DN74A+Mzx/DAJ6K</latexit><latexit sha1_base64="+JiPYLii+TcU89p0vHNUNQ5F7nU=">AAACFXicbVDLSsNAFJ34rPUVdelmsAiCWpIi6EYouumygn1gW8NkOmmHziRhZiKUND/hxl9x40IRt4I7/8ZJmoW2Hrhw5px7uXOPGzIqlWV9GwuLS8srq4W14vrG5ta2ubPblEEkMGnggAWi7SJJGPVJQ1HFSDsUBHGXkZY7uk791gMRkgb+rRqHpMfRwKcexUhpyTFPTrueQDjmTnyX3MeVJNEFL+Gky6NJ+obHUHu1zHPMklW2MsB5YuekBHLUHfOr2w9wxImvMENSdmwrVL0YCUUxI0mxG0kSIjxCA9LR1EecyF6cXZXAQ630oRcIXb6Cmfp7IkZcyjF3dSdHaihnvVT8z+tEyrvoxdQPI0V8PF3kRQyqAKYRwT4VBCs21gRhQfVfIR4inZLSQRZ1CPbsyfOkWSnbVtm+OStVr/I4CmAfHIAjYINzUAU1UAcNgMEjeAav4M14Ml6Md+Nj2rpg5DN74A+Mzx/DAJ6K</latexit><latexit sha1_base64="+JiPYLii+TcU89p0vHNUNQ5F7nU=">AAACFXicbVDLSsNAFJ34rPUVdelmsAiCWpIi6EYouumygn1gW8NkOmmHziRhZiKUND/hxl9x40IRt4I7/8ZJmoW2Hrhw5px7uXOPGzIqlWV9GwuLS8srq4W14vrG5ta2ubPblEEkMGnggAWi7SJJGPVJQ1HFSDsUBHGXkZY7uk791gMRkgb+rRqHpMfRwKcexUhpyTFPTrueQDjmTnyX3MeVJNEFL+Gky6NJ+obHUHu1zHPMklW2MsB5YuekBHLUHfOr2w9wxImvMENSdmwrVL0YCUUxI0mxG0kSIjxCA9LR1EecyF6cXZXAQ630oRcIXb6Cmfp7IkZcyjF3dSdHaihnvVT8z+tEyrvoxdQPI0V8PF3kRQyqAKYRwT4VBCs21gRhQfVfIR4inZLSQRZ1CPbsyfOkWSnbVtm+OStVr/I4CmAfHIAjYINzUAU1UAcNgMEjeAav4M14Ml6Md+Nj2rpg5DN74A+Mzx/DAJ6K</latexit><latexit sha1_base64="+JiPYLii+TcU89p0vHNUNQ5F7nU=">AAACFXicbVDLSsNAFJ34rPUVdelmsAiCWpIi6EYouumygn1gW8NkOmmHziRhZiKUND/hxl9x40IRt4I7/8ZJmoW2Hrhw5px7uXOPGzIqlWV9GwuLS8srq4W14vrG5ta2ubPblEEkMGnggAWi7SJJGPVJQ1HFSDsUBHGXkZY7uk791gMRkgb+rRqHpMfRwKcexUhpyTFPTrueQDjmTnyX3MeVJNEFL+Gky6NJ+obHUHu1zHPMklW2MsB5YuekBHLUHfOr2w9wxImvMENSdmwrVL0YCUUxI0mxG0kSIjxCA9LR1EecyF6cXZXAQ630oRcIXb6Cmfp7IkZcyjF3dSdHaihnvVT8z+tEyrvoxdQPI0V8PF3kRQyqAKYRwT4VBCs21gRhQfVfIR4inZLSQRZ1CPbsyfOkWSnbVtm+OStVr/I4CmAfHIAjYINzUAU1UAcNgMEjeAav4M14Ml6Md+Nj2rpg5DN74A+Mzx/DAJ6K</latexit>
m
2H= (m
2H)
bare+ m
2H<latexit sha1_base64="J6YXOSXoxCW+N2vE4AKPSY3UMGA=">AAACSHicbVBNS8NAEN3Ur1q/qh69LJaCIpZEBL0IRS89VrC12NSw2U506W4SdjdCifl5Xjx68zd48aCINze11M+BgTfvvWF2nx9zprRtP1qFqemZ2bnifGlhcWl5pby61lZRIim0aMQj2fGJAs5CaGmmOXRiCUT4HM79wUmun9+AVCwKz/Qwhp4gVyELGCXaUF7Zq+66gSQ0FV56kV2me1lmGh/hW1ckt/mMd7DRGiOtNEHGsTUZtr3UJxJyq9sHrsnXhleu2DV7VPgvcMaggsbV9MoPbj+iiYBQU06U6jp2rHspkZpRDlnJTRTEhA7IFXQNDIkA1UtHQWS4apg+DiJpOtR4xH7fSIlQaih84xREX6vfWk7+p3UTHRz2UhbGiYaQfh4KEo51hPNUcZ9JoJoPDSBUMvNWTK+JyVWb7EsmBOf3l/+C9l7NsWvO6X6lfjyOo4g20CbaQg46QHXUQE3UQhTdoSf0gl6te+vZerPeP60Fa7yzjn5UofABwyOxJA==</latexit><latexit sha1_base64="J6YXOSXoxCW+N2vE4AKPSY3UMGA=">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</latexit><latexit sha1_base64="J6YXOSXoxCW+N2vE4AKPSY3UMGA=">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</latexit><latexit sha1_base64="J6YXOSXoxCW+N2vE4AKPSY3UMGA=">AAACSHicbVBNS8NAEN3Ur1q/qh69LJaCIpZEBL0IRS89VrC12NSw2U506W4SdjdCifl5Xjx68zd48aCINze11M+BgTfvvWF2nx9zprRtP1qFqemZ2bnifGlhcWl5pby61lZRIim0aMQj2fGJAs5CaGmmOXRiCUT4HM79wUmun9+AVCwKz/Qwhp4gVyELGCXaUF7Zq+66gSQ0FV56kV2me1lmGh/hW1ckt/mMd7DRGiOtNEHGsTUZtr3UJxJyq9sHrsnXhleu2DV7VPgvcMaggsbV9MoPbj+iiYBQU06U6jp2rHspkZpRDlnJTRTEhA7IFXQNDIkA1UtHQWS4apg+DiJpOtR4xH7fSIlQaih84xREX6vfWk7+p3UTHRz2UhbGiYaQfh4KEo51hPNUcZ9JoJoPDSBUMvNWTK+JyVWb7EsmBOf3l/+C9l7NsWvO6X6lfjyOo4g20CbaQg46QHXUQE3UQhTdoSf0gl6te+vZerPeP60Fa7yzjn5UofABwyOxJA==</latexit>
Naturalness a useful (but not required) criterion on motivation for a given SUSY model.
•Address naturaleness independently of the Higgs boson mass.
•Benefit from high integrated luminosity.
• Minimisation condition for Higgs scalar potential.
• Contributions must be tuned to achieve EWSB at the observed energy level, favour low fine tuning.
m
2H⇠ y
t2m
2t˜1
log( ⇤
TeV )
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•Stops in the TeV range.
•Maximal mixing.
m
2H⇠ y
t2| M
3|
2log
2( ⇤
TeV )
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•Light gluinos (few TeV).
Search for light stop. Search for light gluino. Search for low higgsino parameter.
SUSYSignalCrossSections
SUSY Analyses grouped
around production channel cross-sections (RPC):
•Strong production
•Third generation
•Electroweak
Study in addition:
RPV
Long Lived
• First analyses with high cross-section (strong, third generation).
• With high integrated luminosity more interesting
become electroweak searches, compressed, difficult regions.
• With high exclusion of RPC models more interest in RPV models, and uncovered signatures.
• With improvements in reconstruction techniques
and clever solutions for specific signatures, searches for Long-Lived particles interesting.
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.2 SUSY: STRONG PRODUCTION
21
• Largest cross-section, important for early searches (no large gain with increased luminosity).
• Very inclusive, sensitivity to highest number of SUSY models.
• Gluinos excluded up to ~2 TeV, squarks excluded up to ~ 1.9 GeV.
Direct One-step
ATLAS Summary Plots
0 lepton
Phys. Rev. D 97 (2018) 1120012015+2016arXiv:1410.1280
M ef f = ETmiss + X
j
pT (j)
PhysRevD.95.035031
• Recursive Jigsaw Reconstruction (RJR) gives new kinematic variables, by using approximations of the rest frames of invisible particles in each event (using momenta and energy of different objects in new rest frames).
• Conventional analysis uses effective mass as a discriminating variable:
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.3 SUSY: STRONG PRODUCTION
22
2 leptons OS + MET
2016
JHEP 03 (2018) 076
•Uses the invariant mass of the lepton pair,
searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass.
•Motivated by previous small excesses.
‘slepton’
‘Z*’
50 100 150 200
mll [GeV]
entries
‘on Z’
• Kinematic edge for strong interaction.
• Resonance for strong and electroweak production.
2015+2016
Eur. Phys. J. C 78 (2018) 625
•Analysis optimised for Low-pt and High-pt
edge, and “on Z” final states.
• Using strong
production only.
• Large improvement in compressed mass
range.
Sbottom
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.4 SUSY: THIRD GENERATION GLUINO MEDIATED
23
Direct One-step ATLAS-CONF-2018-041
2015+2016+2017!
• Motivated by small excess seen in previous result.
• Uses cut and count and multi-bin fit.
• Multiple b-jets (≥3-4) multiple jets (≥5-9), high Meff and MT,minb-jets, 0-1 lepton.
• Good discriminating variable total jet mass, uses mass of the large radius re- clustered jet (R=1.0)
• Previous small excess not confirmed with more data.
• Interpretation for different BR of gluino with tt, bb, tb.
JHEP 06 (2018) 107 2015+2016
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS 24
JHEP 12 (2017) 085
2015+2016
Stop, 0 l
• Sensitivity to intermediate and high mass range.
Stop, with c
2015+2016
JHEP 09 (2018) 050
•Uses charm tagging (using MVA).
ATLAS Summary Plots
5.5 SUSY: THIRD GENERATION
Bino-like LSP
1/2 L 0/1/2 L 0/1/2 L
• m(stop) - m(N1) = mt
• Overwhelming ttbar background.
•ttbar precision measurement, and mT2 discriminant.
• Excludes stop up to 210GeV.
CMS-PAS-SUS-18-003
Charginos and squarks
2016CMS-SUS-17-010
• 2 leptons OS.
• Sensitivity to
compressed and
intermediate region.
Run2SummariesCMS
Light stop pair
2016
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.5 SUSY: STRONG/THIRD GENERATION
25
2 SS leptons
Sbottom
Eur. Phys. J. C 77 (2017) 578
Multi-leptons
JHEP 02 (2018) 067
JHEP 11 (2017) 195
2015+2016
• Two isolated SS leptons, jets and MET.
• Limits on pair produced gluino,
squark, SS stop, top-quark associated production of a heavy scalar or
pseudoscalar boson decaying to top quarks, SM production of 4t events.
•≥ 3 leptons, jets and MET.
• Event classification for number of b jets, MET, hadronic transverse
momentum, and the invariant mass of 2SF opposite charge leptons.
•In addition to stop searches, a complementary search is for sbottom squarks.
• Uses 0-1 leptons, 0-1 b-jets.
• Improvement in the
sensitivity compared to previous searches. Large improvement to more
complex decay chains.
2016
2016
𝛄 + jets
CMS-PAS-SUS-18-002 2016•Interpretation for gluino and stop pair production, and
GMSB model.
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.6 SUSY: ELECTROWEAK PRODUCTION
26
JHEP 03 (2018) 166 JHEP 03 (2018) 160
/H
Run2SummariesCMS
• Squarks and gluinos have the highest cross-section, but excluded at ~2 TeV.
• Very complex analyses, sensitivity
only with high integrated luminosity.
• High interest in the electroweak
production (gauginos and sleptons).
• Analyses target bino, wino and higgsino production.
• Interesting ranges along the diagonal, as small excess seen.
• Channels consider Nl and flavour.
ATLAS Summary Plots
• Slepton exclusion.
bino LSP
higgsino wino
bino <latexit sha1_base64="nu/ZpLR0DTHhs4ufhvzfOLVEneI=">AAAB/XicbVDLSsNAFL3xWesrPnZuBovgqiQi6LLoxmUF+4Amhslk2g6dTMLMRKgh+CtuXCji1v9w5984bbPQ1gMXDufcy733hClnSjvOt7W0vLK6tl7ZqG5ube/s2nv7bZVkktAWSXgiuyFWlDNBW5ppTruppDgOOe2Eo+uJ33mgUrFE3OlxSv0YDwTrM4K1kQL70NOMRzT3yJAV97lTBLlbBHbNqTtToEXilqQGJZqB/eVFCcliKjThWKme66Taz7HUjHBaVL1M0RSTER7QnqECx1T5+fT6Ap0YJUL9RJoSGk3V3xM5jpUax6HpjLEeqnlvIv7n9TLdv/RzJtJMU0Fmi/oZRzpBkyhQxCQlmo8NwUQycysiQywx0SawqgnBnX95kbTP6q5Td2/Pa42rMo4KHMExnIILF9CAG2hCCwg8wjO8wpv1ZL1Y79bHrHXJKmcO4A+szx/bCJV3</latexit><latexit sha1_base64="nu/ZpLR0DTHhs4ufhvzfOLVEneI=">AAAB/XicbVDLSsNAFL3xWesrPnZuBovgqiQi6LLoxmUF+4Amhslk2g6dTMLMRKgh+CtuXCji1v9w5984bbPQ1gMXDufcy733hClnSjvOt7W0vLK6tl7ZqG5ube/s2nv7bZVkktAWSXgiuyFWlDNBW5ppTruppDgOOe2Eo+uJ33mgUrFE3OlxSv0YDwTrM4K1kQL70NOMRzT3yJAV97lTBLlbBHbNqTtToEXilqQGJZqB/eVFCcliKjThWKme66Taz7HUjHBaVL1M0RSTER7QnqECx1T5+fT6Ap0YJUL9RJoSGk3V3xM5jpUax6HpjLEeqnlvIv7n9TLdv/RzJtJMU0Fmi/oZRzpBkyhQxCQlmo8NwUQycysiQywx0SawqgnBnX95kbTP6q5Td2/Pa42rMo4KHMExnIILF9CAG2hCCwg8wjO8wpv1ZL1Y79bHrHXJKmcO4A+szx/bCJV3</latexit><latexit sha1_base64="nu/ZpLR0DTHhs4ufhvzfOLVEneI=">AAAB/XicbVDLSsNAFL3xWesrPnZuBovgqiQi6LLoxmUF+4Amhslk2g6dTMLMRKgh+CtuXCji1v9w5984bbPQ1gMXDufcy733hClnSjvOt7W0vLK6tl7ZqG5ube/s2nv7bZVkktAWSXgiuyFWlDNBW5ppTruppDgOOe2Eo+uJ33mgUrFE3OlxSv0YDwTrM4K1kQL70NOMRzT3yJAV97lTBLlbBHbNqTtToEXilqQGJZqB/eVFCcliKjThWKme66Taz7HUjHBaVL1M0RSTER7QnqECx1T5+fT6Ap0YJUL9RJoSGk3V3xM5jpUax6HpjLEeqnlvIv7n9TLdv/RzJtJMU0Fmi/oZRzpBkyhQxCQlmo8NwUQycysiQywx0SawqgnBnX95kbTP6q5Td2/Pa42rMo4KHMExnIILF9CAG2hCCwg8wjO8wpv1ZL1Y79bHrHXJKmcO4A+szx/bCJV3</latexit><latexit sha1_base64="nu/ZpLR0DTHhs4ufhvzfOLVEneI=">AAAB/XicbVDLSsNAFL3xWesrPnZuBovgqiQi6LLoxmUF+4Amhslk2g6dTMLMRKgh+CtuXCji1v9w5984bbPQ1gMXDufcy733hClnSjvOt7W0vLK6tl7ZqG5ube/s2nv7bZVkktAWSXgiuyFWlDNBW5ppTruppDgOOe2Eo+uJ33mgUrFE3OlxSv0YDwTrM4K1kQL70NOMRzT3yJAV97lTBLlbBHbNqTtToEXilqQGJZqB/eVFCcliKjThWKme66Taz7HUjHBaVL1M0RSTER7QnqECx1T5+fT6Ap0YJUL9RJoSGk3V3xM5jpUax6HpjLEeqnlvIv7n9TLdv/RzJtJMU0Fmi/oZRzpBkyhQxCQlmo8NwUQycysiQywx0SawqgnBnX95kbTP6q5Td2/Pa42rMo4KHMExnIILF9CAG2hCCwg8wjO8wpv1ZL1Y79bHrHXJKmcO4A+szx/bCJV3</latexit>˜01
˜±1 , ˜02
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˜±2 , ˜03, ˜04
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Gauge unification
at GUT scale Natural SUSY
wino-bino higgsino LSP
higgsino
wino
bino higgsino
wino bino
˜01
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˜±1 , ˜02
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˜01, ˜±1 , ˜02
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˜±2 , ˜04
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˜03
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˜±2 , ˜03, ˜04
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2016 2016
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.6 SUSY: ELECTROWEAK PRODUCTION
27
Wino-bino RJR
arXiv:1806.022932015+2016
•Analysis targets ISR, low-,
intermediate- and high-mass with 2 and 3 leptons.
• Challenging when mass splitting is close to Z mass, using RJR.
• Small excess in the ISR 3L (3.02σ) channel.
CMS-SUS-17-009
• Sets limits on sleptons:
selectron L/R, smuon L/R.
Slepton
• Chargino- neutralino2
production, with decays via W/Z.
2016
SSDi-muon
2016
CMS-PAS-SUS-17-008
•Sets limits on smuon and muon-sneutrino.
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.6 SUSY: HIGGSINO PRODUCTION
28
Higgsino/slepton
Phys. Rev. D 97 (2018) 0520102015+20162015+2016
Multiple b
arXiv:1806.04030•Consists of low and high mass analyses,
uses complex multi-bin fit in meff.
• Using multiple
energetic jets, ≥3 b-jets and MET.
• 4b analysis compatible with 4L for GGM.
ATLAS Summary Plots ATLAS Summary Plots
• Search for
compressed mass
spectrum and higgsino production.
• Selection uses 2 soft leptons, and multi-bin fit in mll and mT2.
• Extends limits on higgsino from LEP.
• General Gauge Mediated
(GGM) and Gauge Mediated
SUSY Breaking (GMSB) models.
• Higgsino production, target decays of h/Z.
JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS
5.7 SUSY: R-PARITY VIOLATION
29
RPC=Zero
RPV coupling Moderate RPV coupling (gauge/Higgs
interactions dominant), LSP at the end of the
chain, it decays as RPV
Large RPV coupling, direct decays if RPV dominates over RPC vertices
W
RP V=
ijk2 L
iL
jE ¯
k+
0ijkL
iQ
jD ¯
k+
00ijk
2 U ¯
iD ¯
jD ¯
k+ k
iL
iH
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General R-parity violating (RPV) superpotential in MSSM
•κ, λ, λ’ all give rise to final states with some amount of MET from neutrinos
•λ’’ gives rise to multijet final states
• Very different phenomenology for transition from RPC to RPV, and dedicated searches for RPV models developed.
RPV re-interpretation
ATLAS-CONF-2018-0032015+2016Re-interpretation of stop searches.
In preparation:
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