How to tell apart non-standard EWSB mechanisms · Bosonic Goldstone since SUSY may not be there to save the day Higgs as a PGB like the pion of QCD composite Higgs Composite Scalar

How to tell apart non-standard

EWSB mechanisms

Veronica SanzCERN and YORK

Moriond 2012

What is standard?

EWSB by elementary scalar(s)

includes SM and SUSY

What is non-standard?

EWSB by-composite scalar- no scalar at all

includes Little Higgs, Extra-Dimensions and Technicolor

In th

is tal

k

What if there is a Higgs? Light scalarNeed stabilization mechanism

(or we have no clue about QFT)

SymmetriesFermionic SUSY

Bosonic Goldstone

since SUSY may not be there to save the day

Higgs as a PGB like the pion of QCD

composite Higgs

Composite Scalar - Motivation

Composite Higgs is realized in Little Higgs, Extra-Dimensions and Technicolor

symmetry PGB -Little Higgs, TC: new 4D symmetry

-Extra-dimensions: SM 5D gauge= 4D gauge+GB

Composite Scalar - Realizations

scalar resonance WW unitarizationnon-SM scalar: deviations

generic features are too SM-like

Giudice, Grojean, Pomarol and Rattazzi ʻ07! =

v2

f2 degree of fine-tuning

composite Higgsalready unitarize WW

Theory study 300 ifb @ 14 TeV for ! > 0.2

! ! 0 SM-like

Composite Scalar-Generic features

v

f

4!f

Composite Scalar-Common features

s=1not crucial for WW scattering

ex. Z’, , !TC ZKK



new gauge symms?

ex. Z’, , !TC ZKK



new gauge symms?

Extra-Dimensions and TC-type

GKK fTC2,ex.s=2

see next

ex. Z’, , ZKK!TC



new gauge symms?

ex. Z’, , !TC ZKK


GKK fTC2,ex.s=2

s=1/2

New heavy quarks mix with SM quarks

QKKex. T, , techni-baryons

see next



new gauge symms?

ex. Z’, , !TC ZKK


GKK fTC2,ex.s=2

s=1/2



3rd gen

light quarks

see next



new gauge symms?

ex. Z’, , !TC ZKK


GKK fTC2,ex.s=2

s=1/2



3rd gen

light quarks

see next

see next

4th gen?

How to tell apart a graviton from an impostor?Guimaraes, Fok, Lewis, VS

in preparation

i.e. massive spin-2 resonance = smoking gun of extra-dimensions?


in preparation

G G


KK-graviton TC-type impostor


in preparation

G G



propagation


in preparation

G G



propagation Pauli-Fierz Pauli-Fierz


in preparation

G G




interactions


in preparation

G G



ci

MGµ!Tµ!

i,SM


interactions


in preparation

G G



ci

MGµ!Tµ!

i,SM


interactions

ci M ! TeVoverlap G with fields i and


in preparation

G G



ci

MGµ!Tµ!

i,SM


interactions ?ci M ! TeVoverlap G with fields i and


in preparationG couplings?


in preparationG

Lorentz and gauge

couplings?

no dimension-4


in preparationG

Lorentz and gauge

couplings?

dimension-5 same as in

Tµ!

flavor and CP invariant

no dimension-4


in preparationG

Lorentz and gauge

couplings?

dimension-5 same as in

Tµ!

G G couples like

same spin determination

How do we distinguish them?

flavor and CP invariant

no dimension-4


in preparation

In any extra-dimension of the type

ds2 = w(z)2 (!µ!dxµdx! ! dz2)

example UED,RS

Rg/! =Br(! gg)Br(! !!)

=8c2

g

c2!

Rg/! = 8

G

G

can produce any other ratio

:

How to tell apart 1st generation RH or LH compositeness? Martin and VS

JHEP (2010)Redi,VS, Weiler

in preparationComposite baryons and elementary quarks mix

Lmixing = !uL,R uL,RUL + (u! d) y ! !L!R




1st generation compositeness! Flavor?





1st generation compositeness! Flavor?MFV if composite sector flavor invariant

Lmixing = !uL,R uL,RUL + (u! d)

• Left-handed compositeness: !Lu ! Id , !Ld ! Id

!Ru ! yu , !Rd ! yd

• Right-handed compositeness: !Lu ! yu , !Ld ! yd

!Ru ! Id , !Rd ! Id

y ! !L!R

Redi, Weiler ‘11





Redi, Weiler ‘11

MFV half of the proton could be composite

1st generation compositeness! Flavor?MFV if composite sector flavor invariant

How to tell apart 1st generation RH or LH compositeness?

LH compositeness RH compositeness

Signature: single production heavy quarkq Q

!

Q

q

W,Z

Q


LH compositeness

Q

q

W,ZMartin and VSJHEP (2010)


LH compositeness

Q

q

W,ZMartin and VSJHEP (2010)

ATLAS-PH-EP-2011-193. Lepton channel w/ 1 ifb.

EW production


Redi,VS, Weilerin preparation

RH compositeness

Q

500 1000 1500 2000

1

2

3

4

mQ (GeV )

mG = 4 TeV

mG = 3 TeV

mG = 2 TeV

Log10(!(fb))

BGs: multijet, W+jets, Z+jets, top pair and single top

Rejection: exclude dijet near W or Z and veto b-tagging, cut on leading jet

ATLAS-PH-EP-2011-154

QCD generated with ALPGEN -> PYTHIA signal xsecs mQ=1 TeV, mG=2 TeV

Looking at current bounds and discovery prospects


Redi,VS, Weilerin preparationRH compositeness

We use two methods: deltaR and leading jetoptimized for high-low mQ

(GeV)3jm0 500 1000 1500 2000 2500 3000 3500 4000

-1N

um

ber

of

Even

ts f

or

10 f

b

0

100

200

300

400

500

(GeV)3jm0 500 1000 1500 2000 2500 3000 3500 4000

-1N

um

ber

of

Even

ts f

or

10 f

b

0

100

200

300

400

500

QCD

Signal

No Scalar-Generic features

s=1 resonances do unitarize WW scattering

Realized in warped extra-dimensions and TC-type

THE problem: S parametersolutions do not abound

Non-calculable, ignore TCSM

Mechanisms to cancel, warped models

Holographic TC Hirn,VSPhys. Rev. Lett. ‘06s=1 cancellation

Cured Higgsless Cacciapaglia et alPhys. Rev. D ‘05(s=1)-(s=1/2) cancellation

Eichten, LanePhys. Lett. B ‘89

In dileptons...

How to tell apart scenarios of dynamical EWSB?Banerjee, Martin and VS

JHEP (2012)

1. Invariant mass

(GeV) - l

+l

m550 600 650 700 750 800 850 900

Arb

itary

Units

0

200

400

600

800

1000

1200TCSM

HTC

CHL

MG> PYTHIA> ATLFAST and DELPHES@7 TeV

(GeV)- l

+l

m0 200 400 600 800 1000 1200

Arb

ita

ry U

nits

1

10

210

310 CHL

ZKK2

ZKK1

How to tell apart scenarios of dynamical EWSB?Banerjee, Martin and VS

JHEP (2012)2. Charge asymmetry

| -l!|-|+

l!|

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5

Arb

ita

ry U

nits

0

100

200

300

400

500

Vector (R=L)

Non-vector (R=(1/3)L)

Chiral (R=0) !

!

!

!

!

!

!

!

!

!

0.1 0.2 0.3 0.4

0.05

0.10

0.15

0.20

0.25

!A! V

A2 + V 2

"2

! "# $%&#

Acharge =N(!! > 0)!N(!! < 0)N(!! > 0) + N(!! < 0)

can tell V,A admixtureeta asym is a good measure

of chirality

A after simulation

!! = |!!+ |!| !!! |

Conclusions✦ Non-standard EWSB ideas abound and have a

very rich phenomenology.

✦ May not be easy to discover by just looking at scalar EWSB sector. Need correlations with other signals.

✦ Tell apart Extra-Dimensions from TC-type: gravitons and its impostor

✦ Tell apart 1st gen RH or LH compositeness in multijets

✦ Tell apart different scenarios of DEWSB in dileptons

Operators

ratio to gluonsgluon-jet from quark-jet?

1. most models: G coupling to light quarks suppressed2. Angular correlations

3. Tag light jet using Galliccio-Schwartz techniques

d!

d cos "!(qq ! G) = 1 + c2

!!!1" 4s2

!!"

to fermions

= 1" c4!! to gluons ,

Documents

How to tell apart non-standard EWSB mechanisms · Bosonic Goldstone since SUSY may not be there to save the day Higgs as a PGB like the pion of QCD composite Higgs Composite Scalar