what is the universe made of? by bob orr the higg, dark matter, supersymmetry and the large hadron...
TRANSCRIPT
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What is the Universe Made Of?
by Bob Orr
The Higg, Dark Matter, SupersymmetryAnd
The Large Hadron Collider
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Plan of Talk
• What we think visible matter is made of.
• The Standard Model
• Quantum forces
• Gauge Theories & Unification of Forces
• Cosmological Evidence for invisible matter
• Supersymmetry
• Large Hadron Collider
• ATLAS
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Is the Universe Made of These?
Proton = (u u d) – held together by gluonsNeutron = (u d d)
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Quantum Forces
• In Quantum Field Theory, particles interact via:.
Exchange of virtual particles
Electrons interact by exchanging:
Virtual Photons
Quarks interact by exchanging:
Virtual Gluons
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Real & Virtual Particles
• Interactions of Real particles, conserve
Energy and Momentum.
• Interactions of Virtual particles, need not conserve these, for short times and distances.
• Hiesenberg’s Uncertainty Principle
E t
p x
Energy & time
Momentum & position
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Weak Interaction• A force very like electromagnetism; but
acts on Weak Charge
• Governs processes in stars ( beta-decay)
• In Fact, electromagnetism and weak forceare aspects of unified electroweak force
• Electric charge and weak charge are
related
• Three “force carriers”
W Z 0
W Z 0
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Electroweak Force
• Photon is massless
• are very massive
• Almost 100 times proton mass
W Z 0
3 Generations
0massZ
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Higgs Boson
• Electromagnetism on its own can be made to give finite results for all calculations.
• Unified Electroweak theory gives infinite results for process like:
• Become finite if include new particle
Higgs boson
• Higgs makes massive, and actually generates masses of fundamental particles. It is a quantum field permeating the universe.
W Z 0
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How Does Higgs Generate Mass?
• In vacuum, a photon:
has velocity c and has zero mass
• In glass a photon
has velocity < c , same as an effective mass
• This is due to photon interacting with
electromagnetic field in condensed matter
• By analogy can understand masses of particles
generated by Higgs Field in vacuum
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Grand Unification.
• At a high enough energy
electromagnetismweak forcestrong (colour) force
become aspects of Grand Unified Force
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Understand History of Universe?
• What we think (thought?) visible matter is made of.
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Hubble’s Law & Big Bang.
• Big Bang model came from observation that
Universe is expanding
• For distant galaxies
velocity = x distance
is Hubble Parameter
• Whether Universe continues to expand, or starts to contract depends on density of matter and energy in Universe.
H0
H0
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Fate of Universe
• If , the density of matter and energy is greater that a critical density the universe will start to contract.
• If is less than the critical density, the universe will continue to expand.
• Usually measure the density in units of
• spherical space-time: contraction
• flat space-time: expansion
• hyperbolic space-time: expansion
0 c
0
c
00 0
02
8
3
c
G
H
0 1
0 1
0 1
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Measuring
• Amazingly enough can measure total matter/energy density in universe
• Measure temperature fluctuations in remnant of fireball from Big Bang.
0
0 1
Map of sky temp~ 3 Kelvin
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Measuring
• Amazingly enough can measure total matter/energy density in universe
• Measure temperature fluctuations in remnant of fireball from Big Bang.
0
0 1
Map of sky temp~ 3 Kelvin
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Measuring
• Amazingly enough can measure total matter/energy density in universe
• Measure temperature fluctuations in remnant of fireball from Big Bang.
0
0 1
Map of sky temp~ 3 Kelvin
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Density of Standard Model Matter
• Referred to as Baryonic Matter
• Density is
• If Universe is made of quarks & leptons
• measured from abundance of elementsproduced in nucleosynthesis of Big Bang.
Deuterium, Helium, Lithium
• Most of Universe is not Standard Model matter. Some kind of Dark Matter
B
B 0 1
B
B 0 05.
B 0
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Density of All Matter M
• Can measure density of all matter, whateverits nature, , by looking at gravitational motion:
rotation curves of galaxiesmotion of galactic clusters
• There is indeed Dark Matter
• So even with this Dark Matter, cannot account for
• Universe must be 60% Dark Energy
M
M 0 0 1.4 .
0 1
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Dark Energy
• If the expansion of the Universe is being slowed down by gravitational attraction; expect that in remote past galaxies were moving apart more rapidly than now.
• Observations of distant supernovae show that in the past galaxies were moving apart more slowly
• Expansion is accelerating
• Driven by some quantum field permeating the Universe.
0 85 0 2. .
( .4 . ) ( . . ) . .0 0 1 0 85 0 2 1 25 0 22
M 1
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Need for Supersymmetry
• In Grand Unified Theories cannot Unify forces, unless postulate unseen form of matter
• Higgs mass runs away to Plank Scale• Three forces never have same strength
• Unless all particles have supersymmetric sparticle partners (of higher mass)
+Sleptons BosinosSquarksSpin 1 Spin1/2
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SUSY + Dark Matter
• Supersymmetric Particles are unstable
• Eventually decay chain ends in Normal matter + lightest SUSY particle
• Lightest SUSYparticle cannot interact withnormal matter
• Lightest SUSY particle good candidate for
Dark Matter(Caveat - Recent evidence indicates that Dark Matter is Self-Interacting)
• Hope to produce
(SUSY - antiSUSY ) pairs and Higgs at
Large Hadron Collider
Susy Normal Susy
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How to Make Matter / AntiMatter?
LHC will be proton - proton collider
For SUSY observation must contain ALLvisible energy, in order to infer invisible SUSY
Colliding high energy beams
Energy of beams transformed into mass of new particles
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Superconducting Magnet
8 Tesla
In order to accelerate protons to high energy,must bend them in circular accelerator
7 TeV momentum needs intense magnetic field
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LHC Magnet
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LHC Tunnel
This is an arc of the circular tunnelCircumference 26.7 Km
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CERN Seen from the Air
• Tunnels of CERN accelerator complex superimposed on a map of Geneva.
• Accelerator is 50 m underground
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CERN Seen from the Air
• Tunnels of CERN accelerator complex superimposed on a map of Geneva.
• Accelerator is 50 m underground
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Generic Experiment
Layers of detector systems around collision point
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Particle Detection
• Different particles detected by different techniques.
• Calorimeter detects ionisation from a shower of secondaries produced by primary particle.
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Generic Detector
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ATLAS
• Our Detector
Canada is building
Endcap Calorimeters (TRIUMF Alberta, UVic)Forward Calorimeters (Toronto
Carleton)
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Forward Calorimeter
FCAL1 - Cu matrix + rods2.6
FCAL2/3 -W matrix, W rodsCu skeleton3.5/3.4
Side view of FCAL
• FCAL is mainly tungsten, uses liquid argonas detecting medium for ionisation from shower
• Close to colliding beams - intense radiation
Cryostat
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Hadronic Forward Calorimeter Principle
W (97%), Ni (2.1%), Fe (0.9%)
Tungsten rods in copper tubes in a matrix built of tungsten slugs
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FCAL2 Module 0
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FCAL2 Module 0
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FCAL2 Module 0
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Preliminary Results
Visible energy distribution for 200 GeV pions - both modules - tail catcher energy cut
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Preliminary Results
Pion Energy Resolution cf Monte Carlo
ATLAS Requirement (jets)
Test Beam Data&Fit
MC of Test Beam
MC Intrinsic Resolution.
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Higgs Discovery
End on View of a simulated Higgs Bosonproduced in the ATLAS Detector