New Physics Scenarios Jay Wacker SLAC SLAC Summer Institute August 5&6, 2009.
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Transcript of New Physics Scenarios Jay Wacker SLAC SLAC Summer Institute August 5&6, 2009.
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New Physics Scenarios
Jay WackerSLAC
SLAC Summer InstituteAugust 5&6, 2009
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Any minute now!When’s the revolution?
An unprecedented moment
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What is a “New Physics Scenario”?
“New Physics”:
A structural change to the Standard Model Lagrangian
“Scenario”:
“A sequence of events especially when imagined”
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Why New Physics?Four Paradigms
Experiment doesn’t match theoretical predictionsBest motivation
Parameters are “Unnatural”Well defined and have good theoretical motivation
Reduce/Explain the multitude of parametersTypically has limited success, frequently untestable
To know what is possibleLet’s us know what we can look for in experiments
Limited only by creativity and taste
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The PlanBeyond the SM Physics is 30+ years old
There is no one leading candidate for new physics
New physics models draw upon all corners of the SM
In 2 hours there will be a sketch some principlesused in a half dozen paradigmsthat created hundreds of models
and spawned thousands of papers
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Outline
The Standard Model
Motivation for Physics Beyond the SM
Organizing Principles for New Physics
New Physics Scenarios
SupersymmetryExtra DimensionsStrong Dynamics
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Standard Model: a story of economy
5 Particles 3 Couplings
symmetry unification
4 forces, 20 particles, 20 parameters
x 3
Mystery of Generations:
15 Particles, 12 Force carriers 2700 Couplings
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The Standard Model... where we stand today
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Standard Model Charges
Field Color Weak Hypercharge
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Motivations for Physics Beyond the Standard Model
The Hierarchy Problem
Dark Matter
Exploration
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The Hierarchy ProblemThe SM suffers from a stability crisis
Higgs vev determined by effective mass, not bare massMany contributions that must add up to -(100 GeV)2
=
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A recasting of the problem:
Why is gravity so weak?
Explain how to make GF large (i.e. v small)
Explain why GN is so small (i.e. MPl large)
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1998: Large Extra Dimensions (Arkani-Hamed, Dimopoulos, Dvali)
High scale is a “mirage”
Gravity is strong at the weak scaleNeed to explain how gravity is weakened
2001: Universal Extra Dimensions (Appelquist, Cheng, Dobrescu)
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1978: Technicolor(Weinberg, Susskind)
1999: Warped Gravity(Randall, Sundrum)
2001: Little Higgs(Arkani-Hamed, Cohen, Georgi)
The Higgs is compositeResolve substructure at small distances
Why hadrons are lighter than Planck Scale
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A New Symmetry
Scalar
Fermion
Supersymmetry
Scalar Mass related to Fermion Mass
Scalar
Scalar
Shift Symmetry
Scalar Mass forbidden
1981: Supersymmetric Standard Model(Dimopoulos, Georgi)
2001: Little Higgs(Arkani-Hamed, Cohen, Georgi)
1974: Higgs as Goldstone Boson(Georgi, Pais)
not specialUV dynamics at
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Dark Matter
85% of the mass of the Universe is not described by the SM
There must be physics beyond the Standard Model
Cold dark matterElectrically & Color Neutral
Cold/SlowRelatively small self interactions
Interacts very little with SM particles
No SM particle fits the bill
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The WIMP Miracle DM was in equilibrium with SM in the Early Universe
DM too dilute to find each other
Reverse process energetically disfavored
Relic density is “frozen in”
Incr
easi
ng
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Boltzmann Equation Solves for
Frozen out when
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We want to see what’s there!
Muon, Strange particles, Tau leptonnot predicted before discovery
Serendipity favors the prepared!
Exploration
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Chirality
Anomaly Cancellation
Flavor Symmetries
Gauge Coupling Unification
Effective Field Theory
Organizing Principlesfor going beyond the SM
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Chirality
A symmetry acting a fermions that forbids masses
Vector symmetry
Allows mass
Axial symmetry
Forbids mass
Can do independent phase rotations
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The Standard Model is a Gauged Chiral Theory
All masses are forbidden by a gauge symmetry
15 different bilinears all forbidden
etc...
The Standard Model force carriers forbid fermion masses
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Electroweak Symmetry BreakingBreaking of Chiral Symmetry
Fermions pick up Dirac Masses
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Effective Field Theory
Take a theory with light and heavy particles
If we only can ask questions in the range
with
Dynamics of light fields described by
Only contribute as
known as “irrelevant operators”
Nonrenomalizable!
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We have only tested the SM to certain precision
How do we know that there aren’t those effects?
We know the SM isn’t the final theory of nature
We should view any theory we test asan “Effective Theory” that describes the dynamics
Shouldn’t be constrained by renormalizability
One way of looking for new physics is bylooking for these nonrenormalizable operators
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Limits on Non-Renormalizable Operators
Baryon Number Violation
Lepton Number Violation
Flavor Violation
CP Violation
Precision Electroweak
Contact Operators
Generic Operators
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Flavor Symmetries
Symmetries that interchange fermions
Turn off all the interactions of the SM = Free Theory
45 Total fermions that look the same in the free theory
global symmetry
Gauge interactions destroy most of this symmetry
Yukawa couplings break the rest...but they are the only source of U(3)5 breaking
U(N) symmetry
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Prevents Flavor Changing Neutral Currents
Imagine two scalars with two sources of flavor breaking
Higgs doesn’t change flavor, but other scalar field is a disaster
Unless or
Can diagonalize mass matrix with unitary transformations
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Anomaly Cancellation
Quantum violation of current conservation
An anomaly leads to a mass for a gauge boson
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Anomaly cancellation:
but the Standard Model is chiral
One easy way: only vector-like gauge couplings
SU(3)SU(3)
SU(3)
U(1)U(1)
U(1)
U(1)SU(3)
SU(3)It works, but is a big constraint!
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Gauge coupling unification: Our Microscope
(GeV)
30
40
20
10
1
2
3
Counts charged matter
Weak scale measurement
High scale particle content
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Grand UnificationGauge coupling unification indicates forces arise from single entity
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Standard Model Summary
The Standard Model is chiral gauge theory
It is an effective field theory
It is anomaly free & anomaly cancellationrestricts new charged particles
Making sure that there is no new sourcesof flavor violation ensures that new theories are
not horribly excluded
SM Fermions fit into GUT multiplets,but gauge coupling unification doesn’t quite work
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The Scenarios
Supersymmetry
Little Higgs Theories
Extra Dimensions
Technicolor
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SupersymmetryDoubles Standard Model particles
Dirac pair of Higgsinos GauginosSfermions
Squarks, Sleptons Gluino, Wino, Bino
Fermions Higgs Gauge
Susy Taxonomy
Needed for anomaly cancellation
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Susy Gauge Coupling Unification
Too good!(Two loop beta functions, etc)
But significantly better than SM or any other BSM theory
Only need to add in particles that contribute to the relative runningGauge Bosons, Gauginos, Higgs & Higgsinos
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SUSY Interactions
Rule of thumb: take 2 and flip spins
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SUSY Breaking
SUSY is not an exact symmetry
We don’t know how SUSY is broken, butSUSY breaking effects can be parameterized in the Lagrangian
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Problem with Parameterized SUSY Breaking
There are over 100 parameters onceSupersymmetry no longer constrains interactions
Most of these are new flavor violation parametersor CP violating phases
Horribly excluded
Susy breaking is not generic!
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Soft Susy Breaking
i.e. Super-GIM mechanismUniversality of soft terms
Need to be Flavor Universal Couplings
Scalar Masses
Trilinear A-Terms
Approximate degeneracy of scalars
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Proton StabilityNew particles ⇒ new ways to mediate proton decay
Lightest Supersymmetric Particle is stable
Dangerous couplings
Must be neutral and colorless -- Dark Matter
Pro
ton
Pion
Supersymmetric couplings that violate SM symmetries
A new symmetry forbids these couplings:
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Mediation of Susy Breaking
MSSMPrimoridal
Susy BreakingMediation
Susy breaking doesn’t occur inside the MSSM
Felt through interactions of intermediate particles
Studied to reduce the number of parametersGauge Mediation
Universal “Gravity” Mediation
Anomaly Mediation
Usually only 4 or 5 parameters...but for phenomenology, these are too restrictive
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The Phenomenological MSSMThe set of parameters that are:
Not strongly constrainedEasily visible at colliders
First 2 generation sfermions are degenerate
3rd generation sfermions in independent
Gaugino masses are free
Independent A-terms proportional to Yukawas
Higgs Masses are Free
5
5
3
3
4
20 Total Parameters
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Charginos & NeutralinosThe Higgsinos, Winos and Binos
After EWSB: 2 Charge +1 Dirac Fermions
4 Charge 0 Majorana Fermions
All mix together, but typically mixture is small
Tend find charginos next to their neutralino brethren
Neutralinos are good DM candidates
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Elementary Phenomenology
Neutralinos Charginos Sleptons Squarks Gluinos
Mas
s
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Collider signaturesTrileptons+MET: If sleptons are available
Neu
tral
inos
Cha
rgin
os
Sle
pton
s
Mas
s
3 Leptons +
ME
T
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Collider signaturesTrileptons+MET
Without sleptons in the decay chain
Neu
tral
inos
Cha
rgin
os
Sle
pton
s
Mas
s
30% leptonic Br of W, 10% leptonic Br of Z
3% Total Branching Rate
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Collider signatures
Gluino Pairs: 4j +MET Squark Pairs: 2j +MET Squark-Gluino Pairs: 3j +MET
mSUGRA Search
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Away from mSUGRA Gluino Search
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The Higgs Mass Problem
Higgs mass gain is only logFine tuning loss is quadratic
Difficult to make the Higgs heavier than 125 GeV in MSSM
Need a susy copy of quartic coupling, only gauge coupling works in MSSM
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Susy is the leading candidate for BSM Physics
Dark Matter candidate
Gauge Coupling Unification
Compelling structure
Become the standard lamppost
Basic Susy Signatures away from mSUGRAare still being explored
A lot of the qualitative signatures of Susyappear in other models
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Extra Dimensions Taxonomy
Large TeV Small
Flat Curved
UEDs RS Models GUT ModelsADD Models
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Kaluza-Klein ModesThe general method to analyze higher dimensional theories
Equations of Motion
One 5D field = tower of 4D fields
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Large Extra Dimensions
GravitySM
n L
1 1010 km
2 1 mm
3 10nm
4 10-2nm
5 100fm
6 1fm
Integrate out extra dimension
Set
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Large Extra Dimension Signatures
Monophoton+MET
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Large Extra Dimension SignaturesBlack Holes at the LHC
for
BHs decaythermally, violating all
global conservation laws
High multiplicity eventswith lots of energy
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Universal Extra Dimensions
+GravitySM
Standard Model has KK modes
All fields go in the bulkM
ass
Impose Dirichlet Boundary Conditions
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UED KK SpectraLevels are degenerate at tree level
All masses within 30% of each other!(This is a widely spaced example!)
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KK Parity
All odd-leveled KK modes are oddSM and even-leveled KK modes are even
Looks like a degenerate Supersymmetry spectrumuntil you can see 2nd KK level
LKP is stable!
Usually KK partner of Hypercharge Gauge boson
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Typical UED EventPair produce colored 1st KK level
Each side decays separately
Difficult is in Soft Spectra
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Randall Sundrum Models
TeV Scale Curved Extra Dimensions
Warp factor
UV Brane IR Brane
At each point of the 5th dimension,there is a different normalization of 4D lengths
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Effects of the Warping
Need to go to canonical normalization
All mass scales on IR brane got crunched by warp factor
Super-heavy IR brane Higgs becomes light!
An IR brane scalar
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Can put all fields on IR brane...
but just like low dimension operators getscrunched, high dimension operators get enlarged!
Motivated putting SM fields in bulk except for the Higgs
UV Brane IR Brane
SM Gauge + Fermions
Higgs boson
Now have SM KK modes, but no KK parity
Resonances not evenly spaced either
Get light KK copies of right-handed top
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Tonnes of Theory & Pheno and Models for RS Models!
AdS/CFT
Theories in Anti-de Sitter space (RS metric)
Equivalent to 4D theories that are conformal (scale invariant)
5D description is way of mocking up complicated 4D physics!
Warping is Dimensional Transmutation
IR Brane is breaking of conformal symmetry
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Technicolor Theories
Imagine there was no Higgs
QCD still gets strong and quarks condense
Condensate has SM gauge quantum numbers
Like the Higgs!
QCD confinement/chiral symmetry breakingbreaks electroweak symmetry
Technicolor is a scaled-up version of QCD
RS Models are the modern versions of Technicolor
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In Technicolor theoriesNot necessarily a Higgs boson
Technirhos usually first resonance
Mediate contributions to
with90 GeV
800 GeV
etc
Need to be lighter than 1 TeV
90 GeV
3 TeV
etc
Can push off the Technirhosusually a scalar resonance becomes narrow
600 GeV
starts playing the role of the Higgs
Requires assumptions about technicolor dynamics
Would like to get scalars lightwithout dynamical assumptions
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Higgs as a Goldstone boson
Higgs boson is a technipion
Pions are light because the areGoldstone bosons of approximate symmetries
f set by Technicolor scale
Goldstone bosons only have periodic potentials
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Little Higgs TheoriesSpecial type of symmetry breaking
Looks like normal “Mexican hat” potential
Lots of group theory to get specific examples
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All have some similar features
New gauge sectors
Vector-like copies of the top quarks
There are extended Higgs sectors
SU(2)L singlets, doublets & triplets
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Conclusion
Beyond the Standard Model Physics is rich and diverse
Within the diversity there are many similar themes
These lectures were just an entry way into the phenomenology of new physics
We’ll soon know which parts of these theorieshave something to do with the weak scale
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References
S. P. Martin
hep-ph/9709356
C. Csaki et al
“Supersymmetry Primer”
“TASI lectures on electroweak symmetry breaking from extra dimensions”hep-ph/0510275
M. Schmaltz, D. Tucker-Smith
“Little Higgs Review”
hep-ph/0502182
I. Rothstein
hep-ph/0308286“TASI Lectures on Effective Field Theory”
G. Kribs
“TASI 2004 Lectures on the pheomenology of extra dimensions”
hep-ph/0605325
J. Wells
hep-ph/0512342
“TASI Lecture Notes: Introduction to Precision Electroweak Analysis”
R. Sundrum“TASI 2004: To the Fifth Dimension and Back”
hep-ph/0508134