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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

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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

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

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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.

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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

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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

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JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

2.1 EXOTICS: HEAVY RESONANCES

6

• 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

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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) 101

2016

Merged for high-mass resonances.

Resolved for low-mass

resonances.

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JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

l

l

2.1 EXOTICS: HEAVY RESONANCES

8

Di-lepton

JHEP06(2018)120

Spin-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

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JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

,l ,l

2.2 EXOTICS: VECTOR-LIKE QUARKS (T/B)

9

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) 177

VLQ with b-jets

JHEP 07 (2018) 089

2015+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.

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JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

t

t µ

µ

2.3 EXOTICS: LEPTOQUARKS

t

10

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

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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+2016

Neutral 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 (κλHHHSMHHH).

ATLAS-CONF-2018-043

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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:1808.03599

2015+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.
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JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

4 DARK MATTER

13

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)

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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).

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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).

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JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

4.2 DM: VISIBLE DECAYS OF THE MEDIATOR

16

m

ff

N 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

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JUDITA MAMUZIC PHYSICS BSM IN ATLAS AND CMS

4.3 DM: DM + HEAVY FLAVOUR, MONO-TOP

17

DM + tt

CMS-EXO-16-049

Mono 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

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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

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JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

5 SUPERSYMMETRY

19

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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= ( 1)

3(B L)+2S

•Predicts a new set of SUSY particles, in

addition to SM particles.

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JUDITA MAMUZIC SUSY SEARCHES WITH 2 LEPTONS USING STRONG AND HIGGSINO PRODUCTION

5.1 SUSY ANALYSES

20

m

2Z

2 = | µ |

2

+ m

2H

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m

2H

= (m

2H

)

bare

+ m

2H

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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

t2

m

2t˜

1

log( ⇤

TeV )

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•Stops in the TeV range.

•Maximal mixing.

m

2H

⇠ y

t2

| M

3

|

2

log

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.

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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+2016

arXiv: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:

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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

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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

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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

(25)

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.

(26)

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

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˜±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

(27)

JUDITA MAMUZIC - X CPAN 2018, SALAMANCA PHYSICS BSM IN ATLAS AND CMS

5.6 SUSY: ELECTROWEAK PRODUCTION

27

Wino-bino RJR

arXiv:1806.02293

2015+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.

(28)

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+2016

2015+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.

(29)

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

=

ijk

2 L

i

L

j

E ¯

k

+

0ijk

L

i

Q

j

D ¯

k

+

00ijk

2 U ¯

i

D ¯

j

D ¯

k

+ k

i

L

i

H

u

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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+2016

Re-interpretation of stop searches.

In preparation:

Referencias

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