PHYSICS BEYOND THE STANDARD MODEL IN ATLAS AND CMS

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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

PHYSICS BEYOND THE STANDARD MODEL

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.

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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 crossing.

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JUDITA MAMUZIC PHYSICS BSM IN ATLAS AND CMS

IMPROVEMENTS IN NEW ANALYSES

4

New models and analyses strategies

• New models (searches for compressed regions, in precision measurements of Higgs couplings, BF, cross-sections)

• New final states (use Higgs boson decays)

• Using multi-bin fits with large number of search regions (sensitivity to wide range of models)

Taggers for complicated objects

• Double b-tagging, charm jets, top tagging, Boosted W/Z/H

• Extensive use of jet substructure

• Usage of machine learning techniques (Boosted Decision Trees, Recursive NN, Deep NN)

Improved object reconstruction

• b-tagging

• Tau tagging

• Overlap removal

• Pileup mitigation

Double b-tagging

ATL-PHYS-PUB-2017-010 DP_2017_049

Top tagger 174 search regions

JETM-2017-011

Pileup mitigation

Phys. Rev. D 96 (2017) 032003

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EXOTICS

5

Covers a wide range of models and final states.

• High diversity in analyses techniques.

• A subset of analyses will be discussed here:

• Heavy resonances

• Vector-like quarks

• Leptoquarks

• In separate sections:

• Dark matter

• Long-lived particles

Courtesy Daniel Hayden

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EXOT: HEAVY RESONANCES

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• Very general search, number of interpretations.

• 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

• Analysis:

• Typical analysis is a “bump hunt”

• If the resonance is not heavy (low mass Z’).

• If the resonances are heavy, boosted object techniques.

q

m

N o. e ve nt s

Signal Bac

kgr ou

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, uses empirical function and sliding window approach.

• 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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EXOT: 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 Standard Model

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 much 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

2015+2016

Bulk Graviton

Merged for high- mass resonances.

Resolved for low- mass resonances.

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EXOT: HEAVY RESONANCES

8

Di-lepton

JHEP06(2018)120

2015+2016

Spin-1 resonance, narrow width (0.6% of the resonance mass)

• Search for a Z’ → ll resonance.

• Clean signature.

• Look for possible deviations from the background predictions.

• Results shown for cross-section ratio of Z’ di-lepton

production, and measured di-lepton production via Z in mll

range 60 -120 GeV.

2015+2016

• 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

l

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EXOT: 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)

VLQ with leptons

JHEP 08 (2018) 177_2015+2016

VLQ with b-jets

JHEP 07 (2018) 089

2015+2016

• Analysis for large BR(T →tH)

• Uses 0 -1 leptons and H and top tag.

• Signal regions use Nb, Nt, NH

• Uses binned likelihood fit on meff.

• Boosted topology (jets close to leptons), uses pt-dependent isolation cone. Uses W/H tagging (uses jet substructure).

• 3 categories:

• 1 lepton, uses min[M(l,b)]

• 2 lepton same sign, uses HT

• 3 lepton, uses ST

2015+2016

arXiv:1808.02343

Tal van Daalen "Searches for vector-like quarks with the ATLAS detector"

VLQ with b-jets

• Statistical combination of T and B, using

channels T→Zt/Wb/Ht, B→Zb/Wt/Hb

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t

t µ

µ

EXOT: 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

2015+2016

• First search for pair produced leptoquarks coupling to top and μ.

• Previous searches considered LQ→tτ and LQ→bν.

• Combined results complete 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.

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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.

• Heavy resonance is assumed to decay to τ+τ− with at least one tau lepton decaying to final states with hadrons and a neutrino.

About to become public

2015+2016

2H in γγbb

• Motivated by constrains on the Higgs-boson self coupling.

• Resonant and non-resonant Higgs boson pair production with final state γγbb.

• 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).

arXiv:1807.04873

CombinedSummaryPlotsHIGGS

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HIGGS AND BSM

12

ATLAS-CONF-2018-049

2015+2016

FCNC

•Search for flavour- changing neutral current decays of a top quark into an up-type quark

(q=u,c) and the Standard Model

Higgs boson, t→Hq.

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 |λtcH| and |λtuH|

couplings.

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DARK MATTER

13

Galactic rotation curves

Observations of 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 is assumed to

interact only weakly. It 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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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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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 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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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.

• Mediator is produced in qq collisions, highest cross-section for a search with a di-jet resonance (multiple approaches to cover different mjj regimes: high-mass and trigger level

analysis, large-R jet).

• Di-lepton resonance has a clean signature, provides high constrains for small mediator-lepton couplings.

Di-jet searches interpreted in DM context

CombinedSummaryPlotsEXOTICS

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DM: DM + HEAVY FLAVOUR, MONO-TOP

17

DM + tt

CMS-EXO-16-049_2015+2016

Mono top

•DM produced in association with top quark pair.

• Insight into the nature of DM.

• Sensitivity to low mass regime, not accessible by direct and indirect

searches.

2015+2016

• 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.

In preparation:

• Search for DM in association with single-top quark using 2015+2016 data.

• Study for DM in association with single-top quark for HL-LHC.

In preparation:

• Search for

H→WW + DM

… On a similar note

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DM: INTERPRETATION

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Exclusion power of different searches 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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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.

•Wino/bino mixes with Higgsino to form

Neutralino and Chargino mass eigenstates.

•Mixing determined by the sparticle masses at the EWK scale.

• 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}

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

SUSY ANALYSES

20

m

²_Z

2 = | µ |

²

+ m

²_H

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m

²_H

= (m

²_H

)

_bare

+ m

²_H

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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

²_H

⇠ y

_t²

m

²_t_˜

1

log( ⇤

TeV )

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•Stops in the TeV range.

•Maximal mixing.

m

²_H

⇠ y

_t²

| M

₃

|

²

log

²

( ⇤

TeV )

<latexit sha1_base64="LH8Jf1g6o7o0QkJF8nkUwtVH7us=">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</latexit><latexit sha1_base64="LH8Jf1g6o7o0QkJF8nkUwtVH7us=">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</latexit><latexit sha1_base64="LH8Jf1g6o7o0QkJF8nkUwtVH7us=">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</latexit><latexit sha1_base64="LH8Jf1g6o7o0QkJF8nkUwtVH7us=">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</latexit>

•Light gluinos (1.4 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.

(21)

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) 112001_2015+2016

arXiv:1410.1280

M ef f = E_T^miss + X

j

p_T (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:

(22)

SUSY: STRONG PRODUCTION

22

2 leptons OS + MET

JHEP 03 (2018) 076_2015+2016

•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’

•The search for a kinematic edge targets production of particles

sensitive to the strong interaction.

• The resonance search targets both strongly and electroweakly

produced particles (later).

2015+2016

Eur. Phys. J. C 78 (2018) 625

GMSB

•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

(23)

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

(24)

Bino-like LSP

1/2 L 0/1/2 L ^{0/1/2 L}

SUSY: THIRD GENERATION

24

JHEP 12 (2017) 085 2015+2016

Stop, 0 l Stop, with c

2015+

2016

Charginos and squarks

Sensitivity to the intermediate and high mass range.

Interrelation in pMSSM.

• Search with 2 leptons OS.

• Sensitivity to compressed and intermediate region.

2015+

2016 CMS-SUS-17-010

JHEP 09 (2018) 050

•MV technique to distinguish c from b or light jets (rejection of hadronically decaying τ).

•Uses charm tagging.

Light stop pair

CMS-PAS-SUS-18-003 2015+2016

• m(stop) - m(N1) = mt

• Overwhelming ttbar background

•ttbar precision measurement, and mT2

discriminant.

• Excludes stop up to 210GeV.

ATLAS Summary Plots

Run2SummariesCMS

(25)

SUSY: STRONG/THIRD GENERATION

25

2 SS leptons

Eur. Phys. J. C 77 (2017) 578

Sbottom

2015+

2016

Multi-leptons

JHEP 02 (2018) 067 2015+2016

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, targets specific parameter space for best sensitivity.

• Improvement in the sensitivity compared to previous

searches. Large improvement to more complex decay chains.

(26)

SUSY: ELECTROWEAK PRODUCTION

26 Gauge unification

at GUT scale Natural SUSY

JHEP 03 (2018) 166 2015+

2016

JHEP 03 (2018) 160 2015+

2016

/H

/H /ν

/ν

/ν /ν

/ν

/l /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).

• Mass spectrum determines gaugino mixing, kinematics differ for different mixing, and analyses target bino, wino

and higgsino LSP. • Interesting ranges along

the diagonal, as small excess seen.

• Sleptons exclusion.

ATLAS Summary Plots

(27)

SUSY: ELECTROWEAK PRODUCTION

27

Wino-bino RJR

arXiv:1806.02293

2015+2016

• Chargino-neutralino2 production, with decays via W/Z.

• Analysis targets ISR, low-, intermediate- and high- mass with 2 and 3 leptons.

• Challenging when mass splitting is close to Z mass, using Recursive Jigsaw Reconstruction (RJR).

• Small excess in the ISR 3L (3.02σ) channel.

CMS-SUS-17-009 2015+

2016

• Sets limits on sleptons:

selectron L/R, smuon L/R.

Slepton

(28)

SUSY: ELECTROWEAK PRODUCTION

28

Higgsino/slepton

^2015+2016

Phys. Rev. D 97 (2018) 052010

2015+2016

Multiple b

arXiv:1806.04030

• General Gauge Mediated (GGM) and

Gauge Mediated SUSY Breaking (GMSB) models.

• Higgsino production, target decays of h/Z.

• 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.

(29)

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

RPV coupling strength

W

_{RP V}

=

^ijk

2 L

_i

L

_j

E ¯

_k

+

⁰_ijk

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

RPV re-interpretation

ATLAS-CONF-2018-003^2015+2016

• Very different phenomenology for transition from RPC to RPV, and dedicated searches for RPV models developed.

Re-interpretation for stop searches.

In preparation:

•Bilinear couplings related to neutrino oscillation data.

•bRPV couplings determined as a fit to neutrino oscillation data.

•Previous measurements done using strong production.

In preparation: Higgsino production analysis within SS/3L analysis.

Bilinear RPV

•With high exclusion reach for RPC models, high interest in RPV.

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LONG-LIVED PARTICLES

30

• Large variety of long-lived (LL) particles signatures.

• ATLAS and CMS are improving and developing new techniques.

• Challenges for trigger, reconstruction, backgrounds.

ATLAS Summary Plots

Pixel dE/dx

arXiv:1808.04095_2015+2016

Phys. Rev. D 94 (2016) 112004

Bethe-Bloch, energy loss per path length via ionisation:

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⌧ dE

dx = Kz

²

Z A

1

2

h 1

2 ln 2m

_e

c

^{2 2 2}

T

_max

I

²

2

( )

2

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charge

velocity

= v c

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• Pixel detector ionisation (sensitive to shorter life times).

• High dE/dx for slow moving and heavy charged particles.

• For LL R-hadron, pixel dE/dx

measurements complementary to

RPV re-interpretation of RPC analyses.

LHC Long-Lived Particle Workshop 23-25 October 2018, Amsterdam

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GENERAL SEARCHES

31

arXiv:1807.07447

• Search for new physics in a (quasi) model independent way.

• Look for statistically significant deviation from the SM expectation.

• Identify selection, then re-apply them in a dedicated analysis on a new dataset (to increase sensitivity).

• Events are first classified in 704 final states categories, considering electrons, muons, b-tagged jets, non-b-tagged jets, photons and

MET (type, multiplicity, pt), and analysed for deviation. (No Z/H or displaced vertices yet.)

• Use MC to predict expected background. Auxiliary measurements for CR and VR.

• Scan on different variables (Meff, Minv, Mobj, thrust, ML). Evaluate statistical estimator p0. Find bin with smallest p0, pchannel.

• Calculate probability of finding pchannel using all bins and all categories, using toys.

• All three leading statistical tests per variable distribution pchannel are consistent with the SM expectation.

2015

(32)

SUMMARY

32

• Very rich scientific program in BSM searches at ATLAS and CMS, results using 2015, 2016 and 2017 data. No significant sign of new physics.

• Due to high luminosity, sensitivity to lower cross-sections, sensitivity to difficult parameter space.

• Improvements in object reconstruction, overlap removal, pileup mitigation, brings to improvements sensitivity.

• Novel techniques, like trigger level analysis, boosted objects, object tagging improve sensitivity in new parameter space.

• Completely new concepts like general searches skim for new physics.

• Exclusion indicates high sensitivity to a very large number of

models, but analyses follow up on small excesses, with same SRs and new SRs motivated by the excesses.

• p-p Run2 data taking is complete, in the next two years analyses will be improving the object reconstruction, more usage of

machine learning, new clever analyses are being prepared, more models are included for completeness, more luminosity!

• Although next two years we will not be collecting data, the results of next analyses will be quite exciting.

STAY TUNED!

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SUPPLEMENTARY MATERIAL

(34)

IFAE BARCELONA

34 Monojet search:

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-27/

DM+HF searches:

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-18/

Sbottom search:

Stop (0-lepton) search:

Gluino (multi-b) search:

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2018-041/

Higgsino (multi-b) search:

VLQ (TT->Ht+X and combination) search:

Charged Higgs (tbH+->tbtb) search:

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2017-04/

FCNC t->qH(bb) search:

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2018-049/

DM ✓

EXOT ✓ SUSY ✓

SUSY SUSY ✓ SUSY ✓ SUSY ✓

HIGG ✓

EXOT ✓

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CIEMAT

UNIVERSIDAD AUTONOMA DE MADRID ………

35

SM, top, Higgs searches

http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-17-013/index.html

EXOT ✓

• Search for high-mass resonances in final states with a lepton and missing transverse momentum at sqrt(s) = 13 TeV 10.1007/JHEP06(2018)128

• Search for high-mass resonances in dilepton final states in proton-proton collisions at sqrt(s) = 13 TeV 10.1007/JHEP06(2018)120

• In general, also, in what concerns high-pT muons.

EXOT ✓

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IFIC / CSIC - UV

36

Higgsino 2L

Strong 2L

Eur. Phys. J. C 78 (2018) 625

* Search for invisible particles produced in association with single- top-quarks in proton--proton collisions at √s = 13

https://cds.cern.ch/record/2301180

* Prospects for a search of invisible particles produced in association with single-top quarks with the ATLAS detector at the HL-LHC

https://cds.cern.ch/record/2640145

EXOT ✓ EXOT ✓

EXOT ✓ EXOT EXOT ✓

SUSY ✓

Phys. Rev. D 97 (2018) 052010

SUSY ✓

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IFCA

37

SUSY ✓

DM ✓ SUSY ✓

DM ✓

SUSY

SUSY ✓

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UNIVERSIDAD DE OVIEDO

38

SUSY ✓

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EXOT: HEAVY RESONANCES

39

X → γ + W/Z/H

Phys. Rev. D 98 (2018) 032015_2015+2016

• Search for a high mass resonance X → γW/Z/H.

• Require high-pt photon and high pT large-R jet, consistent with W, Z or H (new).

• Categories for (2b-tag), jet substructure and

mass window.

• Bump-hunt in the γ + J (large jet) invariant mass distribution.

ttbar resonance

_2015+2016

Boosted ttbar

CMS-B2G-17-017

Signal shape

depends on assumption of relative width.

• Search for resonances above 2 TeV.

• Use non-isolated leptons (correct jet momentum for nearby lepton).

• Use large radius jets with 3 sub-jets (jet

substructue techniques, softdrop grooming for jet mass, Puppi for pileup mitigation).

• First combination of dilepton, single lepton and all-hadronic channels.

• Interpretation for leptophobic topcolor Z’, Kaluza-Klein excitations of the gluon in the Randall-Sundrum model.

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Signal

EXOT: 2017 DATA EXOT: OTHER

40

Z → 4μ, low mass Z’

_2016+2017!

Background

CMS-EXO-18-008

• Search for a narrow Z' gauge boson with a mass between 5

and 70 GeV resulting from an Lμ−Lτ U(1) local gauge symmetry.

• Light Z’ motivated by aμ and Rk anomalies.

• Use 4 isolated muons (>5 GeV), reconstruct Z’→μμ mass.

• Analysis uses mass sliding window.

LFV

_2015+2016

In preparation:

• Lepton Flavor Violation of the Higgs boson, LFV H → t m/e, using 2015+2016 data.

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DM: INTERPRETATION

41

CombinedSummaryPlotsEXOTICS

Exclusion power of different searches depends on the model parameters:

• Axial-vector or vector mediator

• Coupling to quarks, leptons and DM.

SummaryPlotsEXO13TeVCMS

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JUDITA MAMUZIC PHYSICS BSM IN ATLAS AND CMS 42

SummaryPlotsEXO13TeVCMS CombinedSummaryPlotsEXOTICS

Comparison of LHC searches to cosmological DM results (local DM halo scattering of terrestrial nuclei).

Spin-dependent DM-nucleon cross-section.

DM: INTERPRETATION

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DM: INTERPRETATION

43

SummaryPlotsEXO13TeVCMS CombinedSummaryPlotsEXOTICS

Comparison of LHC searches to cosmological DM results (local DM halo scattering of terrestrial nuclei).

Spin-independent DM-nucleon cross-section.