Slide1 l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 97

Non-SUSY Physics Beyond the Standard Model PowerPoint PPT Presentation


  • 146 Views
  • Updated On :
  • Presentation posted in: General

Non-SUSY Physics Beyond the Standard Model. J. Hewett, Pre-SUSY 2010. Why New Physics @ the Terascale?. Electroweak Symmetry breaks at energies ~ 1 TeV (SM Higgs or ???) WW Scattering unitarized at energies ~ 1 TeV (SM Higgs or ???)

Related searches for Non-SUSY Physics Beyond the Standard Model

Download Presentation

Non-SUSY Physics Beyond the Standard Model

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Slide1 l.jpg

Non-SUSY Physics Beyond

the Standard Model

J. Hewett, Pre-SUSY 2010


Why new physics @ the terascale l.jpg

Why New Physics @ the Terascale?

  • Electroweak Symmetry breaks at

    energies ~ 1 TeV (SM Higgs or ???)

  • WW Scattering unitarized at energies ~ 1 TeV (SM Higgs or ???)

  • Gauge Hierarchy: Nature is fine-tuned or Higgs mass must be stabilized by

    New Physics ~ 1 TeV

  • Dark Matter: Weakly Interacting Massive Particle must have mass ~ 1 TeV to reproduce observed DM density

All things point to the Terascale!


The standard model l.jpg

The Standard Model

Brief review of features which guide & restrict BSM physics


The standard model on one page l.jpg

The Standard Model on One Page

SGauge =  d4x FY FY + F F + Fa Fa

SFermions =  d4x   fDf

SHiggs =  d4x (DH)†(DH) – m2|H|2 + |H|4

SYukawa =  d4x YuQucH + YdQdcH† + YeLecH†

( SGravity =  d4x g [MPl2 R + CC4] )

Generations

f = Q,u,d,

L,e


Slide5 l.jpg

EW measurements agree with

SM predictions @ 2+ loop level

Jet production rates @

Tevatron agree with QCD

Standard Model predictions well described by data!

Pull


Global flavor symmetries l.jpg

Global Flavor Symmetries

Q1

u1

d1

L1

e1

.

. 2

.

. 3

Rotate 45 fermions into each other

U(45)

SM matter secretly has a large symmetry:

Explicitly broken by gauging 3x2x1

Rotate among generations

U(3)Q x U(3)u x U(3)d x U(3)L x U(3)e

Explicitly broken by quark Yukawas + CKM

Explicitly broken by charged lepton Yukawas

U(1)e x U(1) x U(1)

Explicitly broken by neutrino masses

U(1)B

Baryon Number

Lepton Number

U(1)L (Dirac)

(or nothing) (Majorana)


Global symmetries of higgs sector l.jpg

Global Symmetries of Higgs Sector

1 + i2

3 + i4

Four real degrees of freedom

Higgs Doublet:

Secretly transforms as a

1

2

3

4

4 of SO(4)

Decomposes into

subgroups

(2,2) SU(2) x SU(2)

SU(2)L of EW

Left-over Global Symmetry


Global symmetries of higgs sector8 l.jpg

Global Symmetries of Higgs Sector

1 + i2

3 + i4

Four real degrees of freedom

Higgs Doublet:

Secretly transforms as a

Gauging U(1)Y explicitly breaks

Size of this breaking given by Hypercharge coupling g’

1

2

3

4

SU(2)Global Nothing

4 of SO(4)

Decomposes into

subgroups

MW2 g2

=  1 as g’0

MZ2 g2 + (g’)2

(2,2) SU(2) x SU(2)

New Physics may excessively break SU(2)Global

SU(2)L of EW

Remaining Global Symmetry

Custodial Symmetry


Standard model fermions are chiral l.jpg

Standard Model Fermions are Chiral

-

Fermions cannot simply ‘pair up’ to form mass terms

i.e., mfLfR is forbidden Try it!

(Quc) 1 2 -1/2

(Qdc) 1 2 +1/2

(QL) 3 1 -1/3

(Qe) 3 2 +7/6

(ucdc) 3x3 1 -1/3

(ucL) 3 2 -7/6

(uce) 3 1 +1/3

(dcL) 3 2 -5/6

(dce) 3 1 +4/3

(Le) 1 2 +1/2

SU(3)C SU(2)L U(1)Y

Fermion masses must be generated by Dimension-4 (Higgs) or higher operators to respect SM gauge invariance!

-

-

-

-

-

-


Slide10 l.jpg

An anomaly leads to a mass for a gauge boson

Anomaly Cancellation

Quantum violation of current conservation


Anomaly cancellation l.jpg

Anomaly Cancellation

SU(3)

SU(3)

SU(2)L

SU(2)L

U(1)Y

U(1)Y

g

g

3[ 2‧(1/6) – (2/3) + (1/3)] = 0

Q uc dc

U(1)Y

U(1)Y

U(1)Y

U(1)Y

3[3‧(1/6) – (1/2)] = 0

Q L

3[ 6‧(1/6)3 + 3‧(-2/3)3 + 3‧(1/3)3

+ 2‧(-1/2)3 + 13] = 0

3[(1/6) – (2/3) + (1/3) – (1/2) +1]

= 0

Q uc dc L e

Can’t add any new fermion  must be chiral or vector-like!


Symmetries of the standard model summary l.jpg

Symmetries of the Standard Model: Summary

SU(3)C x SU(2)L x U(1)Y

Exact

Broken to U(1)QED

  • Gauge Symmetry

  • Flavor Symmetry

  • Custodial Symmetry

  • Chiral Fermions

  • Gauge Anomalies

U(3)5 U(1)B x U(1)L (?)

Explicitly broken by Yukawas

SU(2)Custodial of Higgs sector

Broken by hypercharge so  = 1

Need Higgs or Higher order operators

Restrict quantum numbers of new fermions


Symmetries of the standard model summary13 l.jpg

Symmetries of the Standard Model: Summary

SU(3)C x SU(2)L x U(1)Y

Exact

Broken to U(1)QED

  • Gauge Symmetry

  • Flavor Symmetry

  • Custodial Symmetry

  • Chiral Fermions

  • Gauge Anomalies

U(3)5 U(1)B x U(1)L (?)

Explicitly broken by Yukawas

SU(2)Custodial of Higgs sector

Broken by hypercharge so  = 1

Need Higgs or Higher order operators

Restrict quantum numbers of new fermions

Any model with New Physics must respect these symmetries


Standard model is an effective field theory l.jpg

Standard Model is an Effective field theory

An effective field theory has a finite range of applicability in energy:

, Cutoff scale

Energy

SM is valid

Particle masses

All interactions consistent with gauge symmetries are permitted, including higher dimensional operators whose mass dimension is compensated by powers of 


Slide15 l.jpg

Lepton Number Violation

Precision Electroweak

Generic Operators

Flavor Violation

CP Violation

Baryon Number Violation

Contact Operators

Constraints on Higher Dimensional Operators

Λ≳ 1016 GeV

Λ≳ 1015 GeV

Λ≳ 106 GeV

Λ≳ 106 GeV

Λ≳ 103 GeV

Λ≳ 103 GeV

Λ≳ 3x102 GeV


Slide16 l.jpg

  • What sets the cutoff scale  ?

  • What is the theory above the cutoff?

    New Physics, Beyond the Standard Model!

    Three paradigms:

  • SM parameters are unnatural

    • New physics introduced to “Naturalize”

  • SM gauge/matter content complicated

    • New physics introduced to simplify

  • Deviation from SM observed in experiment

     New physics introduced to explain


How unnatural are the sm parameters l.jpg

How unnatural are the SM parameters?

Technically Natural

  • Fermion masses

    (Yukawa Couplings)

  • Gauge couplings

  • CKM

    Logarithmically

    sensitive to the cutoff

    scale

  • Technically Unnatural

    • Higgs mass

    • Cosmological constant

    • QCD vacuum angle

  • Power-law sensitivity to the cutoff scale


Slide18 l.jpg

The naturalness problem that has had the greatest impact on collider physics is:

The Higgs (mass)2 problem

or

The hierarchy problem


The hierarchy l.jpg

The Hierarchy

Energy (GeV)

1019

Planck

1016

GUT

desert

Future Collider Energies

103

Weak

All of known physics

Solar System

Gravity

10-18


The hierarchy problem l.jpg

The Hierarchy Problem

Energy (GeV)

1019

Planck

Quantum Corrections:

Virtual Effects drag

Weak Scale to MPl

1016

GUT

desert

Future Collider Energies

mH2 ~

~ MPl2

103

Weak

All of known physics

Solar System

Gravity

10-18


A cellar of new ideas l.jpg

A Cellar of New Ideas

a classic!

aged to perfection

better drink now

mature, balanced, well

developed - the Wino’s choice

’67 The Standard Model

’77 Vin de Technicolor

’70’s Supersymmetry: MSSM

’90’s SUSY Beyond MSSM

’90’s CP Violating Higgs

’98 Extra Dimensions

’02 Little Higgs

’03 Fat Higgs

’03 Higgsless

’04 Split Supersymmetry

’05 Twin Higgs

svinters blend

all upfront, no finish

lacks symmetry

bold, peppery, spicy

uncertain terrior

complex structure

young, still tannic

needs to develop

sleeper of the vintage

what a surprise!

finely-tuned

double the taste

J. Hewett


Last minute model building l.jpg

Last Minute Model Building

Anything Goes!

  • Non-Communtative Geometries

  • Return of the 4th Generation

  • Hidden Valleys

  • Quirks – Macroscopic Strings

  • Lee-Wick Field Theories

  • Unparticle Physics

  • …..

    (We stilll have a bit more time)


New physics @ lhc7 l.jpg

New Physics @ LHC7

Most cases controlled by

Parton flux

Supermodel Discovery Criteria:

  • Large σLHC giving ≥ 10 events at ℒ = 10 pb-1

  • Small σTevatron giving ≤ 10 events with ℒ = 10 fb-1

  • Large BF to easy to detect final state

  • Consistency with other bounds

Solid: 7 TeV vs Tevatron

Dashed: 10 TeV vs Tevatron

Bauer etal 0909.5213


New physics @ lhc724 l.jpg

New Physics @ LHC7

Most cases controlled by

Parton flux

Supermodel Discovery Criteria:

  • Large σLHC giving ≥ 10 events at ℒ = 10 pb-1

  • Small σTevatron giving ≤ 10 events with ℒ = 10 fb-1

  • Large BF to easy to detect final state

  • Consistency with other bounds

Naive, but a reasonable guide

Solid: 7 TeV vs Tevatron

Dashed: 10 TeV vs Tevatron

Bauer etal 0909.5213


Qcd pair production reach @ lhc7 l.jpg

QCD Pair Production Reach @ LHC7

-

-

  • gg,qq → QQ

  • Assumes 100% reconstruction efficiencies

  • No background

Current Tevatron bound

On 4th generation T’ quark:

~ 335 GeV (4.6 fb-1)

Tevatron

exclusion

LHC7 should cover entire

4th generation expected

region!

Bauer etal 0909.5213


High mass resonances l.jpg

High Mass Resonances


Z resonance gut models l.jpg

Z’ Resonance: GUT Models

LRM

E6 GUTS

LHC7

Tevatron Bounds

Rizzo


Slide28 l.jpg

Small

Large

TeV

Extra Dimensions Taxonomy

Flat

Curved

GUT Models

UEDs

ADD Models

RS Models


Extra dimensions can be difficult to visualize l.jpg

Extra dimensions can be difficult to visualize

  • One picture: shadows of higher dimensional

  • objects

2-dimensional shadow of a rotating cube

3-dimensional shadow of a rotating hypercube


Extra dimensions can be difficult to visualize30 l.jpg

Extra dimensions can be difficult to visualize

  • Another picture:extra dimensions are too small

    for us to observe  they are

    ‘curled up’ and compact

The tightrope walker only sees one dimension: back & forth.

The ants see two dimensions: back & forth and around the circle


Slide31 l.jpg

Every point in spacetime has curled up extra dimensions associated with it

One extra dimensionis a circle

Two extra dimensions can be represented by a sphere

Six extra dimensions can be represented by a Calabi-Yau space


The braneworld scenario l.jpg

The Braneworld Scenario

  • Yet another picture

  • We are trapped on a

  • 3-dimensional spatial

  • membrane and cannot move

  • in the extra dimensions

  • Gravity spreads out and

  • moves in the extra space

  • The extra dimensions can

  • be either very small or

  • very large


Are extra dimensions compact l.jpg

Are Extra Dimensions Compact?

  • QM tells us that the momentum of a particle traveling along an infinite dimension takes a continuous set of eigenvalues. So, if ED are infinite, SM fields must be confined to 4D OTHERWISE we would observe states with a continuum of mass values.

  • If ED are compact (of finite size L), then QM tells us that p5 takes on quantized values (n/L). Collider experiments tell us that SM particles can only live in ED if 1/L > a few 100 GeV.


Kaluza klein tower of particles l.jpg

Kaluza-Klein tower of particles

E2 = (pxc)2 + (pyc)2 + (pzc)2 + (pextrac)2 + (mc2)2

In 4 dimensions, looks like a mass!

Recall pextra = n/R

Tower of massive particles

Small radius

Large radius


Kaluza klein tower of particles37 l.jpg

Kaluza-Klein tower of particles

E2 = (pxc)2 + (pyc)2 + (pzc)2 + (pextrac)2 + (mc2)2

In 4 dimensions, looks like a mass!

Recall pextra = n/R

Tower of massive particles

Large radius gives finely separated Kaluza-Klein particles

Small radius gives well separated Kaluza-Klein particles

Small radius

Large radius


Action approach consider a real massless scalar in flat 5 d l.jpg

Action Approach:Consider a real, massless scalarin flat 5-d


Masses of kk modes are determined by the interval bc l.jpg

Masses of KK modes are determined by the interval BC


Time like or space like extra dimensions l.jpg

Time-like or Space-like Extra Dimensions ?

Consider a massless particle, p2 =0, moving in flat 5-d

Then p2 = 0 = pμpμ± p52

If the + sign is chosen, the extra dimension is time-like,

then in 4-d we would interpret p52 as a tachyonic mass

term, leading to violations of causality

Thus extra dimensions are usually considered to be

space-like


Higher dimensional field decomposition l.jpg

Higher Dimensional Field Decomposition

  • As we saw, 5d scalar becomes a 4d tower of scalars

  • Recall: Lorentz (4d) ↔ Rotations (3d)

    scalar scalar

    4-vector Aμ A, Φ

    tensor Fμν E, B

  • 5d: 5d ↔ 4d

    scalar (scalar)n

    vector AM (Aμ, A5)n

    tensor hMN (hμν, hμ5, h55)n

    KK towers


Higher dimensional field decomposition42 l.jpg

Higher Dimensional Field Decomposition

  • As we saw, 5d scalar becomes a 4d tower of scalars

  • Recall: Lorentz (4d) ↔ Rotations (3d)

    scalar scalar

    4-vector Aμ A, Φ

    tensor Fμν E, B

  • (4+δ)d: (4+δ)d ↔ 4d (i=1…δ)

    scalar (δ scalars)n

    vector AM (Aμ, Ai)ni

    tensor hMN (hμν, hμi, hij)n

    KK towers

    1 tensor, δ 4-vectors, ½ δ(δ+1) scalars


Slide43 l.jpg

  • Experimental observation of KK states:

    Signals evidence of extra dimensions

  • Properties of KK states:

    Determined by geometry of extra dimensions

     Measured by experiment!

The physics of extra dimensions is the physics of the KK excitations


What are extra dimensions good for l.jpg

What are extra dimensions good for?

  • Can unify the forces

  • Can explain why gravity is weak (solve hierarchy problem)

  • Can break the electroweak force

  • Contain Dark Matter Candidates

  • Can generate neutrino masses

    ……

Extra dimensions can do everything SUSY can do!


If observed things we will want to know l.jpg

If observed: Things we will want to know

  • How many extra dimensions are there?

  • How big are they?

  • What is their shape?

  • What particles feel their presence?

  • Do we live on a membrane?


If observed things we will want to know46 l.jpg

If observed: Things we will want to know

  • How many extra dimensions are there?

  • How big are they?

  • What is their shape?

  • What particles feel their presence?

  • Do we live on a membrane?

  • Can we park in extra dimensions?

  • When doing laundry, is that where all the socks go?


Searches for extra dimensions l.jpg

Searches for extra dimensions

Three ways we hope to see extra dimensions:

  • Modifications of gravity at short distances

  • Effects of Kaluza-Klein particles on astrophysical/cosmological processes

  • Observation of Kaluza-Klein particles in high energy accelerators


The hierarchy problem extra dimensions l.jpg

The Hierarchy Problem: Extra Dimensions

Energy (GeV)

1019

Planck

Simplest Model:

Large Extra Dimensions

1016

GUT

desert

Future Collider Energies

103

Weak – Quantum Gravity

= Fundamental scale in

4 +  dimensions

MPl2 = (Volume) MD2+

Gravity propagates in

D = 3+1 +  dimensions

All of known physics

Solar System

Gravity

10-18


Large extra dimensions l.jpg

Large Extra Dimensions

Arkani-Hamed, Dimopoulos, Dvali, SLAC-PUB-7801

Motivation: solve the hierarchy problem by removing it!

SM fields confined to 3-brane

Gravity becomes strong in the bulk

Gauss’ Law: MPl2 = V MD2+ , V = Rc 

MD = Fundamental scale in the bulk

~ TeV


Constraints from cavendish type exp ts l.jpg

Constraints from Cavendish-type exp’ts


Bulk metric linearized quantum gravity l.jpg

Bulk Metric: Linearized Quantum Gravity

  • Perform Graviton KK reduction

  • Expand hAB into KK tower

  • SM on 3-brane

    • Set T = AB (ya)

  • Pick a gauge

  • Integrate over dy

  • Interactions of Graviton KK states with SM fields on 3-brane


Feyman rules graviton kk tower l.jpg

Feyman Rules: Graviton KK Tower

Massless 0-mode + KK states have indentical coupling to matter

Han, Lykken, Zhang; Giudice, Rattazzi, Wells


Slide53 l.jpg

Collider Tests


Graviton tower exchange xx g n yy l.jpg

Graviton Tower Exchange:XX  Gn  YY

Giudice, Rattazzi, Wells

JLH

Search for 1) Deviations in SM processes

2) New processes! (gg  ℓℓ)

Angular distributions reveal spin-2 exchange

M

Gn are densely packed!

(s Rc) states are exchanged! (~1030 for =2 and s = 1 TeV)


Slide56 l.jpg

Forward-Backward Asymmetry

Drell-Yan Spectrum @ LHC

MD = 2.5 TeV

4.0

JLH

Graviton Exchange


Graviton exchange @ 7 tev lhc l.jpg

Graviton Exchange @ 7 TeV LHC


Graviton tower emission l.jpg

Graviton Tower Emission

Giudice, Ratazzi,Wells

Mirabelli,Perelstein,Peskin

-

  • e+e- /Z + Gn Gn appears as missing energy

  • qq  g + Gn Model independent – Probes MD

    directly

  • Z  ff + Gn Sensitive to 

    Parameterized by density of states:

-

Discovery reach for MD (TeV):


Slide60 l.jpg

Graviton Emission @ LHC


Slide61 l.jpg

Graviton Emission @ LHC @ 7 TeV


Detailed lhc atlas mc study l.jpg

Detailed LHC/ATLAS MC Study

The 14 TeV LHC is seen

to have considerable search

reach for KK Graviton

production

Hinchliffe, Vacavant


Current bounds on graviton emission l.jpg

Current Bounds on Graviton Emission


Beware l.jpg

BEWARE!

  • There is a subtlety in this calculation

  • When integrating over the kinematics, we enter a region where the collision energies EXCEED the 4+n-dimensional Planck scale

  • This region requires Quantum Gravity or a UV completion to the ADD model

  • There are ways to handle this, which result in minor modifications to the spectrum at large ET that may be observable


The hierarchy problem extra dimensions66 l.jpg

The Hierarchy Problem: Extra Dimensions

Energy (GeV)

1019

Planck

Model II:

Warped Extra Dimensions

1016

GUT

strong curvature

desert

Future Collider Energies

103

Weak

wk = MPl e-kr

All of known physics

Solar System

Gravity

10-18


Non factorizable curved geometry warped space l.jpg

Non-Factorizable Curved Geometry: Warped Space

Area of each grid is equal

Field lines spread out

faster with more volume

 Drop to bottom brane

Gravity appears weak on top brane!


Localized gravity warped extra dimensions l.jpg

Localized Gravity: Warped Extra Dimensions

Randall, Sundrum

Bulk = Slice of AdS5

5 = -24M53k2

k = curvature scale

Hierarchy is generated by exponential!

Naturally stablized via Goldberger-Wise


4 d effective theory l.jpg

4-d Effective Theory

Davoudiasl, JLH, Rizzo

Phenomenology governed by two parameters:

 ~ TeV

k/MPl≲ 0.1

5-d curvature:

|R5| = 20k2 < M52


Interactions l.jpg

Interactions

Recall  = MPlekr ~ TeV


Randall sundrum graviton kk spectrum l.jpg

Randall-Sundrum Graviton KK spectrum

Davoudiasl, JLH, Rizzo

Unequal spacing signals curved space

e+e- →μ+μ-

e+e-+-

LHC

pp → l+l-

Different curves for k/MPl =0.01 – 1.0


Tevatron limits on rs gravitons l.jpg

Tevatron limits on RS Gravitons


Summary of theory experimental constraints l.jpg

Summary of Theory & Experimental Constraints

LHC can cover entire allowed parameter space!!


Problem with higher dimensional operators l.jpg

Problem with Higher Dimensional Operators

  • Recall the higher dimensional operators that mediate proton decay & FCNC

  • These are supposed to be suppressed by some high mass scale

  • But all high mass scales present in any RS Lagrangian are warped down to the TeV scale.

  • ⇒ There is no mechanism to suppress these dangerous operators!

  • Could employ discrete symmetries ala SUSY – but there is a more elegant solution….


Peeling the standard model off the brane l.jpg

Peeling the Standard Model off the Brane

  • Model building scenarios require SM bulk fields

    • Gauge coupling unification

    • Supersymmetry breaking

    •  mass generation

    • Fermion mass hierarchy

    • Suppression of higher dimensional operators

Start with gauge fields in the bulk:

  • Gauge boson KK towers have coupling gKK = 8.4gSM

  • Precision EW Data Constrains: m1A > 25 TeV   > 100 TeV!

  • SM gauge fields alone in the bulk violate custodial symmetry

Davoudiasl, JLH, Rizzo

Pomarol


Derivation of bulk gauge kk spectrum l.jpg

Derivation of Bulk Gauge KK Spectrum


Schematic of wavefunctions l.jpg

Schematic of Wavefunctions

Can reproduce

Fermion mass

hierarchy

Planck brane

TeV brane


Fermions in the bulk l.jpg

Fermions in the Bulk

  • Zero-mode fermions couple weaker to gauge KK states than brane fermions

towards Planck brane

towards TeV brane

Precision EW Constraints


Slide80 l.jpg

Collider Signals are more difficult

KK states must couple to gauge fields or top-quark to

be produced at observable rates

-

gg  Gn  ZZ

gg  gn  tt

Agashe, Davoudiasl, Perez, Soni hep-ph/0701186

Lillie, Randall, Wang, hep-ph/0701164


Black hole production @ lhc l.jpg

Black Hole Production @ LHC:

Dimopoulos, Landsberg

Giddings, Thomas

Black Holes produced when s > MD

Classical Approximation: [space curvature << E]

E/2

b < Rs(E)  BH forms

b

E/2

^

MBH ~ s

Geometric Considerations:

Naïve = FnRs2(E), details show this holds up to a

factor of a few


Blackhole formation factor l.jpg

Blackhole Formation Factor


Potential corrections to classical approximation l.jpg

Potential Corrections to Classical Approximation

RS2/(2Rc)2

n = 2 - 20

  • Distortions from

    finite Rc as Rs Rc

    2. Quantum Gravity Effects

    Higher curvature term

    corrections

Critical point for

instabilities for n=5:

(Rs/Rc)2 ~ 0.1 @ LHC

n = 2 - 20

Gauss-Bonnet term

n2≤ 1 in string models


Production rate is enormous l.jpg

Production rate is enormous!

Naïve ~ n for large n

1 per sec at LHC!

MD = 1.5 TeV

JLH, Lillie, Rizzo


Black hole decay l.jpg

Black Hole Decay

  • Balding phase: loses ‘hair’ and multiple moments by gravitational radiation

  • Spin-down phase: loses angular momentum by Hawking radiation

  • Schwarzschild phase: loses mass by Hawking radiation – radiates all SM particles

  • Planck phase: final decay or stable remnant determined by quantum gravity


Decay properties of black holes after balding l.jpg

Decay Properties of Black Holes (after Balding):

Decay proceeds by thermal emission of Hawking radiation

Not very sensitive to BH rotation for n > 1

At fixed MBH, higher dimensional BH’s are hotter:

N ~ 1/T

 higher dimensional BH’s emit fewer quanta, with each quanta having higher energy

Multiplicity for n = 2 to n = 6

Harris etal hep-ph/0411022


Grey body factors l.jpg

Grey-body Factors

Particle multiplicity in decay:

 = grey-body factor

Contain energy & anglular emission information


P t distributions of black hole decays l.jpg

pT distributions of Black Hole decays

Provide good discriminating power for value of n

Generated using modified CHARYBDIS linked to PYTHIA

with M* = 1 TeV


Slide92 l.jpg

Black Hole event simulation @ LHC


Cosmic ray sensitivity to black hole production l.jpg

Cosmic Ray Sensitivity to Black Hole Production

No suppression

Ringwald, Tu

Anchordoqui etal


Summary of exp t constraints on m d l.jpg

Summary of Exp’t Constraints on MD

Anchordoqui, Feng

Goldberg, Shapere


Summary of physics beyond the standard model l.jpg

Summary of Physics Beyond the Standard Model

  • There are many ideas for scenarios with new physics! Most of our thinking has been guided by the hierarchy problem

  • They must obey the symmetries of the SM

  • They are testable at the LHC

  • We are as ready for the LHC as we will ever be

  • The most likely scenario to be discovered at the LHC is the one we haven’t thought of yet.

Exciting times are about to begin.

Be prepared for the unexpected!!


Fine tuning does occur in nature l.jpg

Fine-tuning does occur in nature

2001 solar eclipse as viewed from Africa


Slide97 l.jpg

H. Murayama

Most Likely Scenario @ LHC:


  • Login