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

Status and 13(14) TeV

Prospects on BSM physics

at the LHC

DongHee KimKyungpook National University

2013 KIAS Phenomenology WorkshopNov 12, 2013

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

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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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


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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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


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



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


CM

S: P

AS-

SUS-

13-0

11



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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



Limits in “Higgs-aware” MSUGRA/CMSSM plane

Gluino masses below ~1.4 TeV excluded for any squark mass

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■ 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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■ 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

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

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

anomalous Gauge Couplings

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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


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


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


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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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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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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CMS + ATLAS Gauge Coupling Summary

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Lots Physics below

Physics Potential @ 13(14) TeV

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Toward 13(14) TeV (& with High-Luminosity) !

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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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New Particle Discovery Potential

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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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Neutralino /Chargino search

■ 5σ discovery of charginoand neutralino masses are ~ 700 GeV and LSP mass ~200 GeV

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Gluino Search

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Squark and EWKino Searches

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Heavy Gauge Bosons

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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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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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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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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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■ BACKUP

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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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Direct stop production : stop t + LSP




~660 GeV for stop mass and ~ 250 GeV excluded for LSP

Documents

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