DISPLACED PHYSICS AT THE LHC Eric Kuflik Cornell University with - - PowerPoint PPT Presentation

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DISPLACED PHYSICS AT THE LHC Eric Kuflik Cornell University with - - PowerPoint PPT Presentation

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DISPLACED PHYSICS AT THE LHC Eric Kuflik Cornell University with Csaba Csaki (Cornell) Salvator Lombardo (Cornell) Oren Slone (Tel Aviv) Tomer Volansky (Tel Aviv) OUTLINE Motivation Dynamical R-Parity Violation displaced LSP

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SLIDE 1

DISPLACED PHYSICS AT THE LHC

Eric Kuflik Cornell University 


with Csaba Csaki (Cornell) Salvator Lombardo (Cornell) Oren Slone (Tel Aviv) Tomer Volansky (Tel Aviv)

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SLIDE 2

OUTLINE

  • Motivation

✴ Dynamical R-Parity Violation — displaced LSP ✴ Twin Higgs models — displaced Higgs decays

  • Bounds on models
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SLIDE 3

DYNAMICAL R-PARITY VIOLATION

  • C. Csaki, EK, T. Volansky, Phys.Rev.Lett. 112 (2014) 131801 [arXiv:1309.5957]
  • C. Csaki, EK, O. Slone, T. Volansky, JHEP 1506 (2015) 045 [arXiv:1502.03096]
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SLIDE 4

NO SUPERSYMMETRY?

There must be supersymmetry! Naturalness Grand Unification Dark Matter Is supersymmetry natural? Bounds typically assume large missing-energy

muon electron jet jet MET

  • R-parity violation to

the rescue!?

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SLIDE 5

R-PARITY CHEAT SHEET

  • Renormalizable baryon and lepton number violating
  • perators allowed:





  • Small and hierarchical in order to not generate

proton decay, di-nucleon decay, flavor violation, etc…

  • Impose R-Parity

  • SM particles are even / superpartners are odd
  • Every vertex contains an even number of super

partners

  • LSP cannot decay - every event has missing

energy

W = LL¯ e + LQ ¯ d + ¯ u ¯ d ¯ d

˜ d ¯ u ¯ d Q L Q Q        π0 K0 p                 

Proton Decay

(Q, ¯ u, ¯ d, L, ¯ e) → −(Q, ¯ u, ¯ d, L, ¯ e) (Hu, Hd) → (Hu, Hd)

˜ f ˜ λ f

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SLIDE 6

R-PARITY VIOLATION

R-Parity conservation is not required

  • If broken, the breaking must be small


Perhaps…

  • Baryon or lepton number is exact - why?
  • Couplings are hierarchal - some large,

some small

  • Approximate symmetry of the MSSM, but

it may be strongly broken elsewhere

˜ d ¯ u ¯ d Q L Q Q        π0 K0 p                 

Proton Decay

˜ Lk Qα

i

¯ dα

j

Qβ†

j

dβ†

i

FCNC

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SLIDE 7

RPV OPERATORS

Which RPV terms are largest in the visible sector?

  • Standard RPV operators?

OhRPV = λ LL¯ e + λ0 LQ ¯ d + λ00 ¯ u ¯ d ¯ d OhBL = µ0LHu

If we know R-parity violating operators are small, why do we only consider renormalizable ones?

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SLIDE 8

RPV OPERATORS

Which RPV terms are largest in the visible sector?

  • Standard RPV operators?
  • Higher order holomorphic operators?
  • Non-holomorphic operators?

OhRPV = λ LL¯ e + λ0 LQ ¯ d + λ00 ¯ u ¯ d ¯ d OhBL = µ0LHu Od5(1)

hRPV = ρ HdQQQ + ρ0HdQ¯

u¯ e Od5(2)

hRPV = κ00 LHuHdHu

OnhRPV = η ¯ u¯ e ¯ d† + η0 Q¯ uL† + η00 QQ ¯ d† + κ¯ eHdH†

u

OnhBL = κ0L†Hd

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SLIDE 9

DYNAMICAL R-PARITY VIOLATION

  • R-Parity is broken in (a hidden sector) by field S
  • In the low energy EFT, S is the spurion of R-Parity breaking
  • Charge of S under U(1)B-L and U(1)R will determine leading
  • perators

R

SM messengers

hSi M

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SLIDE 10

LEADING OPERATOR?

OhRPV = λ LL¯ e + λ0 LQ ¯ d + λ00 ¯ u ¯ d ¯ d OhBL = µ0LHu Od5(1)

hRPV = ρ HdQQQ + ρ0HdQ¯

u¯ e Od5(2)

hRPV = κ00 LHuHdHu

OnhRPV = η ¯ u¯ e ¯ d† + η0 Q¯ uL† + η00 QQ ¯ d† + κ¯ eHdH†

u

OnhBL = κ0L†Hd U(1)B−L U(1)R OhRPV, OhBL −1 3/2 Od5(1)

hRPV

1 5/2 Od5(2)

hRPV

−1 7/2 OnhRPV, OnhBL 1 1/2

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SLIDE 11

LEADING OPERATOR?

OhRPV = λ LL¯ e + λ0 LQ ¯ d + λ00 ¯ u ¯ d ¯ d OhBL = µ0LHu U(1)B−L U(1)R S 1 1/2 U(1)B−L U(1)R OhRPV, OhBL −1 3/2 Od5(1)

hRPV

1 5/2 Od5(2)

hRPV

−1 7/2 OnhRPV, OnhBL 1 1/2

Leading operators:

WdRP V = S M OhRPV + SOhBL, KdRP V = S∗ M 2 OnhRPV + S∗ M OnhBL

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SLIDE 12

U(1)B−L U(1)R S −1 −1/2

LEADING OPERATOR?

Od5(1)

hRPV = ρ HdQQQ + ρ0HdQ¯

u¯ e OnhRPV = η ¯ u¯ e ¯ d† + η0 Q¯ uL† + η00 QQ ¯ d† + κ¯ eHdH†

u

OnhBL = κ0L†Hd U(1)B−L U(1)R OhRPV, OhBL −1 3/2 Od5(1)

hRPV

1 5/2 Od5(2)

hRPV

−1 7/2 OnhRPV, OnhBL 1 1/2

Leading operators:

WdRP V = S M 2 Od5(1)

hRPV,

KdRP V = S M 2 OnhRPV + S M OnhBL

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SLIDE 13

U(1)B−L U(1)R S −1 −1/2

LEADING OPERATOR?

U(1)B−L U(1)R OhRPV, OhBL −1 3/2 Od5(1)

hRPV

1 5/2 Od5(2)

hRPV

−1 7/2 OnhRPV, OnhBL 1 1/2

Not the standard RPV terms Leading operators:

WdRP V = S M 2 Od5(1)

hRPV,

KdRP V = S M 2 OnhRPV + S M OnhBL

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SLIDE 14

THE KAHLER OPERATORS

Z d4θ S⇤ M 2 ✓ ηijk¯ ui¯ ej ¯ d†

k + η0 ijkQi¯

ujL†

k + 1

2η00

ijkQiQj ¯

d†

k

◆ Different helicity and flavor structure compared to standard operators

LL¯ e + LQ ¯ d + ¯ u ¯ d ¯ d

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SLIDE 15

THE KAHLER OPERATORS

Z d4θ S⇤ M 2 ✓ ηijk¯ ui¯ ej ¯ d†

k + η0 ijkQi¯

ujL†

k + 1

2η00

ijkQiQj ¯

d†

k

◆ Different helicity and flavor structure compared to standard operators

LL¯ e + LQ ¯ d + ¯ u ¯ d ¯ d

All superfields can be the same flavor A neutrino-top-stop interaction Different helicity structure

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SLIDE 16

THE KAHLER OPERATORS

All operators (with just one scalar) are chirally suppressed or suppressed by SUSY breaking Z d4θ S⇤ M 2 ✓ ηijk¯ ui¯ ej ¯ d†

k + η0 ijkQi¯

ujL†

k + 1

2η00

ijkQiQj ¯

d†

k

◆

If SUSY breaking effects are absent,

  • perators are automatically hierarchal 


and suppressed for light flavors!

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SLIDE 17

Instead of only considering Let’s also consider K = 1 M

  • ¯

u¯ e ¯ d† + Q¯ uL† + QQ ¯ d† W = λ

  • LL¯

e + LQ ¯ d + ¯ u ¯ d ¯ d

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SLIDE 18
  • Stop can decay via the operator
  • Will be chirally suppressed (∝md,s,b)
  • Can decay into displaced anti-bottoms

LSP DECAYS

STOP EXAMPLE

cτ˜

t!¯ b¯ b ' 10 cm

✓300 GeV m˜

t

◆ ✓M 2/hSi 109GeV ◆2

  • 1

η00

333

  • 2

K = 1 M QQ ¯ d†

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SLIDE 19

SOME MORE…

¯ t ˜ ν t ˜ b ¯ t ¯ b ˜ t ¯ b ¯ b t ˜ t ¯ ν Q¯ uL∗ QQ ¯ d∗ :

:

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SLIDE 20

SUMMARY #1

  • RPV operators suppressed by messenger scale, light

fermion masses, and/or SUSY breaking

  • Operators also break flavor symmetries, may have

additional flavor suppression

  • LSP likes to decay to 3rd generation particles, and in much
  • f the parameter space it is displaced 



 
 and sometimes prompt and sometimes collider stable…

τLSP ∼ 1 mm − 1 km

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SLIDE 21

NEUTRAL NATURALNESS

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SLIDE 22

UN-COLORED TOP PARTNERS

image: Roni Harnik

Do top partners need to be colored? ∼ y2

t

16π2 NcΛ2

  • To cancel quadratic

divergence (at one-loop)

  • Need to relate the

couplings

  • Need 3 colors of top

partners

×Nc ×Nc

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SLIDE 23

THE TWIN HIGGS

SM SM`

Z2

A full copy of the SM

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SLIDE 24

MODELS

  • Many UV completions, Folded SUSY, Quirky Little

Higgs, Holographic Twin Higgs, Orbifold Higgs, …

  • Phenomenology depends strongly on the details.
  • “Fraternal Twin Higgs”— only 3rd generation partners
  • Lightest partner will be glueballs of QCD’


(similar in Folded SUSY)

  • N. Craig, A. Katz, M. Strassler, and R. Sundrum, JHEP 1507 (2015) 105 [arXiv:1501.05310]
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SLIDE 25

DISPLACED HIGGS

The SM Higgs can decay into mirror glueballs Which then decay back to the SM

Mirror Glueball

x

SM Higgs Twin Higgs Mirror Glueball Mirror Top Mirror Gluon

x

Mirror Top SM Higgs Twin Higgs Mirror Gluon SM Particles Mirror Glueball

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SLIDE 26

DISPLACED SEARCHES AT THE LHC

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SLIDE 27

CMS DISPLACED DIJET

p p

Primary Vertex jet jet

  • Search for 2 displaced jets

with pT > 60 GeV

  • Important cuts
  • HT > 325 GeV (trigger)
  • mDV > 4 GeV (no b’s,

detector interactions)

  • Ntracks > 4, 5
  • At most one prompt (IP

<0.5 mm) track per jet

  • Dijet consistent with DV

Search for long-lived neutral particles decaying to quark- antiquark pairs in proton-proton collisions at sqrt(s) = 8 TeV

Secondary Vertex

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SLIDE 28

ATLAS DV + muon/e/jets/MET

p p

  • Search for displaced vertex

with

  • Ntracks > 5
  • mDV > 10 GeV
  • Trigger/cut on associated
  • bject
  • muon, pT > 55 GeV
  • electron, pT > 125 GeV
  • MET > 180 GeV
  • Jets 4, 5 or 6,


pT > 65, 60, 55 GeV

Search for massive, long-lived particles using multitrack displaced vertices or displaced lepton pairs in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector

jets / MET μ/e

0.5 mm 2 mm

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SLIDE 29

CONSTRAINTS ON RPV

  • C. Csaki, E. Kuflik, S. Lombardo, O. Slone, T. Volansky JHEP 1508 (2015) 016 [arXiv:1505.00784]
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SLIDE 30

RPV SCENARIOS

  • Looked at cases

motivated by naturalness

  • Light stops, gluinos, and

higgsinos

  • Only considered direct

production of LSPs

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SLIDE 31

RECAST

  • Feynrules→Madgraph→


Pythia→Delphes

  • LSP displaced by writing

proper lifetimes to LHE file (VTIMUP column)

  • Stop and gluino hadronize (R-

hadrons supported by Pythia 8)

  • Displaced R-hadrons typically

enhance DV reconstruction eff.

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SLIDE 32

RECAST

  • Use displaced tracking efficiency

parametrized by track IP and Lxy

  • Applied cuts and vertex reconstruction

procedure for ATLAS + CMS displaced vertex searches

  • ATLAS: vertex tracks with IP > 1.5 mm,

merge truth-level vertices within 1 mm

  • f each other
  • CMS: reconstruct displaced dijet using

track information

  • Typically reproduce efficiencies for

benchmark models within 20%

  • Recast HSCP at parton level
  • Prompt searches applied directly
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SLIDE 33

˜ t → ¯ d ¯ d

Search for pair- produced resonances decaying to jet pairs in proton-proton collisions at sqrt(s) = 8 TeV (CMS, 1412.7706)

CMS-dijet ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 1400 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) p p t ˜ t ˜*, t ˜ d d

CMS-dijet ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 1400 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) p p t ˜ t ˜*, t ˜ b d

CMS-dijet ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 1400 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) p p t ˜ t ˜*, t ˜ b b

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SLIDE 34

Leptoquark searches

˜ t → dl+

CMS-dijet ATLAS-e ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) t ˜ b e

CMS-dijet ATLAS- ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) t ˜ b

CMS-dijet ATLAS-MET ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) t ˜ b

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SLIDE 35

˜ t → uν

R-Parity conserving stop searches R-Parity conserving scharm searches

CMS-dijet ATLAS-MET ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) t ˜ t

CMS-dijet ATLAS-MET ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) t ˜ c

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SLIDE 36

R-Parity violating search R-Parity conserving gluino searches

GLUINOS

CMS-dijet ATLAS- ATLAS-MET ATLAS-jet HSCP HSCP: CS

500 1000 1500 2000 10-1 1 101 102 103 104 105 106 mg

(GeV)

c (mm) g ˜ t b b

CMS-dijet ATLAS- ATLAS-MET ATLAS-jet HSCP HSCP: CS

500 1000 1500 2000 10-1 1 101 102 103 104 105 106 mg

(GeV)

c (mm) g ˜ t t

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SLIDE 37

GLUINOS

CMS-dijet ATLAS-e ATLAS-MET ATLAS-jet HSCP HSCP: CS

500 1000 1500 2000 10-1 1 101 102 103 104 105 106 mg

(GeV)

c (mm) g ˜ t b e

CMS-dijet ATLAS- ATLAS-MET ATLAS-jet HSCP HSCP: CS

500 1000 1500 2000 10-1 1 101 102 103 104 105 106 mg

(GeV)

c (mm) g ˜ t b

CMS-dijet ATLAS- ATLAS-MET ATLAS-jet HSCP HSCP: CS

500 1000 1500 2000 10-1 1 101 102 103 104 105 106 mg

(GeV)

c (mm) g ˜ t b

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SLIDE 38

HIGGSINOS

CMS-dijet ATLAS-MET ATLAS-jet HSCP

200 400 600 800 1000 10-1 1 101 102 103 104 105 106 mH

(GeV)

c± (mm) H ˜0 t b , H ˜- b b

0=3900×± 0=13.×± 0=4.0×± 0=2.4×± 0=1.9×± 0=1.6×± 0=1.4×± 0=1.3×± CMS-dijet ATLAS-MET ATLAS-jet HSCP

200 400 600 800 1000 10-1 1 101 102 103 104 105 106 mH

(GeV)

c± (mm) H ˜0 t b , H ˜- b b

0=3900×± 0=13.×± 0=4.0×± 0=2.4×± 0=1.9×± 0=1.6×± 0=1.4×± 0=1.3×± CMS-dijet ATLAS-MET ATLAS-jet HSCP

200 400 600 800 1000 10-1 1 101 102 103 104 105 106 mH

(GeV)

c (mm) H ˜0/H ˜- t/b t

0=15×103± 0=2.2×± 0=±/4.4 0=±/8.3 0=±/11. 0=±/13. 0=±/15.

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SLIDE 39

SUMMARY #2: 
 DISPLACED SUSY

  • Bounds on displaced RPV

are very strong 
 
 Does not save natural supersymmetry

  • Prompt RPV might save

natural supersymmetry

CMS-dijet ATLAS-jet HSCP HSCP: CS Prompt

200 400 600 800 1000 1200 1400 10-1 1 101 102 103 104 105 106 mt

(GeV)

c (mm) p p t ˜ t ˜*, t ˜ b b

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SLIDE 40

CONSTRAINTS ON DISPLACED HIGGS

  • C. Csaki, EK, S. Lombardo, O. Slone Phys.Rev. D92 (2015) 073008 [arXiv:1508.01522]
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SLIDE 41

DISPLACED HIGGS

H πv πv p p ¯ f f ¯ f f

mπν = 10, 25, 40 GeV

  • Look for Higgs decay to

two light particles

  • Light particles decay to

SM pairs

  • Assume branching ratios

proportional to Higgs couplings.

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SLIDE 42

EXISTING CONSTRAINTS

  • ATLAS search for decays

in the HCAL

  • ATLAS search for decays

in the muon system

  • ATLAS multitrack DV

+muon/e/jets/MET searches are not sensitive due to strong triggers on leptons, jets and MET

40 GeV 10 GeV 50 GeV 25 GeV 60 GeV 40 GeV

  • () []

% /

ATLAS

s = 8 TeV

CMS

s = 8 TeV (recast)

8 TeV

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SLIDE 43

EXISTING CONSTRAINTS

  • Recast CMS dijet

analysis - dedicated displaced trigger allows some coverage, but HT > 325 GeV and merged jets decreases efficiency.

  • Picks up boosted

Higgs or w/ISR

40 GeV 10 GeV 50 GeV 25 GeV 60 GeV 40 GeV

  • () []

% /

ATLAS

s = 8 TeV

CMS

s = 8 TeV (recast)

8 TeV

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SLIDE 44

RUN I - SHORTCOMING

  • Run I tracker DV searches were not sensitive because:
  • Triggers thresholds were too strong - required more pT than a typical Higgs event
  • Cuts on displaced vertex (MDV) were too strong for light long-lived particles
  • Need a more model-dependent search for light decays in the tracker
  • A signal where leading decay is one DV per event is not constrained by DV searches
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SLIDE 45

RUN I - SHORTCOMING

Target Region 1 DV 2 DV

  • Run I tracker DV searches were not sensitive because:
  • Triggers thresholds were too strong - required more pT than a typical Higgs event
  • Cuts on displaced vertex (MDV) were too strong for light long-lived particles
  • Need a more model-dependent search for light decays in the tracker
  • A signal where leading decay is one DV per event is not constrained by DV searches
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SLIDE 46

NTRACKS VS MDV

  • Weak DV requirements

may require dealing with background

  • Motivates the need for

DV selection strategies to reduce background events, e.g.

  • DV+Higgs signature
  • DV+disp. dijet
  • DV+disp. jet w/

substructure


  • Requiring objects coming

from DV significantly reduces background

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SLIDE 47

RUN II - TRIGGERS

  • New CMS jet trigger

best for 2 mm to 20

  • cm. But new 4 x larger

impact parameter than Run I

  • For lifetimes smaller

than a few mm, use VBF/lepton triggers

Trigger Trigger Requirement Displaced jet HT > 175 GeV or three jets with p

j1,2,3 T

> (92, 76, 64) GeV, |ηj1,2,3| < (5.2, 5.2, 2.6) with |ηj1| or |ηj2| < 2.6, and two of the three jets satisfying mjj > 500 GeV, and ∆η > 3.0. A displaced jet satisfying pT > 40 GeV, at most 1 prompt track (2D IP < 2.0 mm) a, and at least 2 displaced tracks. Inclusive VBF Two jets with |ηj1,j2| > 2, ηj1 · ηj2 < 0, |ηj1 − ηj2| > 3.6 and mj1,j2 > 1000 GeV. VBF, h → b¯ b Three jets with p

j1,2,3 T

> (112, 80, 56) GeV and |ηj1,2,3| < (5.2, 5.2, 2.6) and at least

  • ne of the two first jets with |ηj1| or |ηj2| <

2.6. Isolated Lepton One lepton with pT > 25 GeV, |η| < 2.4, and 3D IP < 1 mm. Isolation requires the summed pT of all tracks with pT > 1 and within ∆R < 0.2 of the lepton is less than 10% of the lepton pT . Trackless jets A jet with pT > 40 GeV and |η| < 2.5 matched with a muon with pT > 10 GeV within ∆R = 0.4. No tracks with pT > 0.8 GeV in the ID within a ∆φ × ∆η region of 0.2 × 0.2.

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SLIDE 48

TRIGGER EFFICIENCIES

Trigger mπv (GeV) c⇥ = 1 mm c⇥ = 10 mm c⇥ = 100 mm ggF VBF VH Total ggF VBF VH Total ggF VBF VH Total Displaced jet 10 0.4% 1.3% 1.1% 0.5% 12.6% 20.2% 25.1% 13.7% 17.1% 42.0% 34.7% 19.8% 25 0.2% 0.8% 0.7% 0.3% 7.6% 20.4% 16.9% 8.9% 17.2% 45.3% 37.3 % 20.2% 40 0.3% 1.0% 0.9% 0.4% 7.3% 19.7% 16.4% 8.6% 16.3% 44.6% 36.3% 19.3% Inclusive VBF 10 1.9% 15.5% 0.8% 2.8% 1.8% 15.5% 0.7% 2.8% 1.6% 15.1% 0.6% 2.6% 25 1.7% 15.3% 0.7% 2.7% 1.7% 15.3% 0.7% 2.7% 1.6% 15.2% 0.6% 2.6% 40 1.6% 15.2% 0.7% 2.6% 1.6% 15.2% 0.7% 2.6% 1.6% 15.2% 0.6% 2.6% VBF, h → b¯ b 10 5.8% 20.3% 13.1% 7.2% 5.8% 20.2% 13.0% 7.2% 3.5% 13.3% 8.1% 4.4% 25 4.6% 16.6% 10.9% 5.8% 4.7% 16.7% 10.9% 5.9% 4.2% 15.2% 9.7% 5.3% 40 4.0% 14.2% 9.2% 5.0% 4.0% 14.2% 9.2% 5.0% 3.8% 13.9% 8.9% 4.8% Isolated Lepton 10 3.6% 3.7% 14.7% 4.1% 1.0% 1.0% 12.5% 1.5% 0.1% 0.2% 11.8% 0.6% 25 1.0% 1.5% 13.0% 1.6% 0.3% 0.4% 11.9% 0.8% 0.05% 0.07% 11.7% 0.6% 40 1.0% 1.4% 12.6% 1.6% 0.3% 0.4% 11.9% 0.8% 0.05% 0.07% 11.6% 0.6% Trackless jet 10 0.02% 0.04% 0.04% 0.02% 0.8% 1.5% 1.3% 0.9% 2.0% 2.4% 2.2% 2.0% 25 0.02% 0.04% 0.06% 0.02% 0.5% 1.0% 0.8% 0.6% 3.6% 5.9% 5.0% 3.8% 40 0.01% 0.02% 0.03% 0.01% 0.1% 0.2% 0.2% 0.1% 2.1% 4.1% 3.3% 2.3%

Displaced triggers are best except for small lifetimes

slide-49
SLIDE 49
  • We present projections for 5 potential tracker DV

searches

  • CMS Run II displaced jet trigger (best sensitivity)
  • Vertex tracks with IP > 1.5 mm and iteratively merge

truth-level vertices within 1 mm of each other

  • Scan over mass and lifetime of long-lived π
  • DV selection criteria are similar to existing searches

RUN II PROJECTIONS

slide-50
SLIDE 50
  • Search I: Single DV with mDV ≥10 GeV and Ntracks ≥5 tracks based on ATLAS

multitrack DV search. Good for high mass ≥40 GeV

  • Search II: One DV with Ntracks ≥5, no mass requirement (allow lighter LLPs),

but reproduce Higgs and LLP masses in invariant mass of displaced jets

mv = 25 GeV mv = 40 GeV

  • () []

% / = -

mv = 10 GeV mv = 25 GeV mv = 40 GeV

  • () []

% / = -

PROPOSED SEARCH STRATEGIES

slide-51
SLIDE 51

mv = 10 GeV mv = 25 GeV mv = 40 GeV

  • () []

% / = -

  • Search III: Single DV+disp. dijet with mDV ≥4 GeV and Ntracks ≥4 tracks based
  • n CMS search.
  • Search IV: Same DV requirements as III but within a displaced jet with 2-

prong substructure.

mv = 10 GeV mv = 25 GeV mv = 40 GeV

  • () []

% / = -

PROPOSED SEARCH STRATEGIES

slide-52
SLIDE 52
  • Search V: Search for 2 DVs (Ntracks ≥ 5) in the same event, comparable to an

ATLAS search.
 
 


mv = 10 GeV mv = 25 GeV mv = 40 GeV

  • () []

% / = -

PROPOSED SEARCH STRATEGIES

slide-53
SLIDE 53

COMBINED PROJECTIONS

  • Combined: best sensitivities for five tracker searches and projected MS and

HCAL ATLAS result based on rescaling cross sections.
 
 


mv = 10 GeV mv = 25 GeV mv = 40 GeV

  • () []

% / = -

slide-54
SLIDE 54

SINGLE DV

mv = 10 GeV mv = 25 GeV mv = 40 GeV

  • () []

% / = -

  • Combined Search III and IV: sensitivity for case with just one displaced

vertex, assuming the second particle just escapes the detector. (Unconstrained by existing DV searches)
 


slide-55
SLIDE 55

SUMMARY

  • RPV can give different phenomenology
  • dRPV: Mediation to MSSM will make it naturally suppressed — often

gives rise to displaced vertices

  • Bounds on displaced RPV very strong
  • Neutral Naturalness often give displaced Higgs
  • Run II can have sensitivities down to 10
  • 4 branching ratios.