Open Questions: CP Symmetry Violation
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Prerequisites: The standard model
See also: Matter/antimatter asymmetry --
The vacuum --
Higgs physics
Strong interactions are invariant under CP.
Total CP violation is interpreted as value of a spinless quantum field
of the axion.
Axion solution requires existence of a global Peccei-Quinn symmetry.
Spontaneous breaking of Peccei-Quinn symmetry implies Goldstone boson,
which is the axion.
Site indexes
-
CP Violation in B Decay: Related Links
- Part of the
CP News site. Contains links to some survey articles and
research facilities which investigate B meson decay and CP
violation.
Sites with general resources
-
CP News
- Published by the University of Cincinnati CP group. Main
features are the informative
FAQ list,
news,
a short
glossary, and some
external links.
-
Belle Collaboration
- Home page for a research group that is studing the origin
of CP violation. Belle experiments use the
KEK B-factory electron-positron
collider in Japan.
-
BaBar Collaboration Home Page
- BaBar is SLAC's
primary high-energy physics program to investigate
matter-antimatter asymmetry in nature
. Information for the
general public is at the
BaBar Public Web Home Page.
-
CERN Axion solar Telescope
- CAST is an experiment located at
CERN that is attmpting to detect axions which may be generated
in the Sun. The site includes information on axions, publications
of the CAST group, and related links.
-
The Large Hadron Collider beauty experiment
- Home page of LHC experiment for precise measurements
of CP violation and rare decays. Includes some reference material
on relevant physics.
Surveys, overviews, tutorials
-
CPT symmetry
- Article from
Wikipedia.
See also
C-symmetry,
P-symmetry,
T-symmetry,
CP-symmetry.
-
A triangle that matters
- April 2007 article from
Physics World, by
Tim Gershon.
"Physicists at "B-factories" in the US and Japan are closing
in on an abstract diagram called the unitarity triangle in the
quest to explain the difference between matter and antimatter.
But such measurements could also point the way to the discovery
of new fundamental particles."
-
Nature's flawed mirror
- July 2003 article from
Physics World, by
Paul Harrison. "Two experiments on opposite sides of the world have
measured charge-parity violation - the key to understanding why
there is more matter than antimatter in the universe."
-
Big break for charge symmetry
- June 2003 article from
Physics World, by
Gerald A. Miller and Ubirajara van Kolck.
"Two new experiments have detected charge-symmetry breaking, the
mechanism responsible for protons and neutrons having different
masses."
-
Spin, Statistics, CPT and All That Jazz
- "A little grab-bag of proofs of the spin-statistic relations,
with some stuff about CPT thrown in", by John Baez.
-
CP-Violation, B-Physics, and the Early Universe
- Brief but useful overview, by Larry Gladney.
-
Why does CP violation matter to the universe?
- September 1999 article by John Ellis. Gives an explanation
of the relationship between CP violation and the asymmetry
of matter and antimatter.
-
What exactly is the 'spin' of subatomic particles?
- Several answers to the question in a Scientific American
Ask the Experts article.
-
CP Violation
- Lecture notes by
Steve Lloyd,
from a course on
Elementary Particle Physics.
-
What is an axion?
- Answer provided by Leslie J. Rosenberg.
-
Background information on Lorentz and CPT violation
- Theory and experimental tests related to the possibility
that CPT symmetry (and hence Lorentz symmetry) might be violated.
Questions and answers by Alan Kostelecky.
-
TASI Lectures on The Strong CP Problem
- A technical paper by Michael Dine. Full paper available in
PDF and other formats.
-
A violation of CP symmetry in B meson decays
- May/June 2002 article from
Europhysics News, by Yannis Karyotakis and Gautier Hamel de
Monchenault concerning CP assymetries in the decay of neutral B
mesons. The article provides a good technical explanation of
both relevant background and the new results.
-
In Search of Antimatter
- August 2001 article from Scientific American Explore,
subtitled "Two international collaborations have announced definitive
answers to one small piece of the universe's matter-antimatter
asymmetry problem."
-
B factories go into overdrive
- March 2001 news article from
PhysicsWeb.
-
CERN confirms direct CP violation
- June 22, 1999
PhysicsWeb
news article.
-
Direct CP symmetry violation and matter-antimatter asymmetry:
new findings from an experiment at CERN
- June 28, 1999 press release about CP symmetry violations
observed in neutral kaon experiments at CERN.
-
Experiment sees the arrow of time - at last!
- December 1998 article from
Physics World, by
Nick Mavromatos. "The classical laws of physics cannot distinguish
between the past and the future, but now experiments at CERN have
confirmed that time-reversal symmetry is broken in neutral kaons."
-
Time's arrow seen in particle decays
- November 16, 1998
PhysicsWeb
news article.
Technical papers
-
On CPT Symmetry: Cosmological, Quantum-Gravitational and other
possible violations and their phenomenology
- 2003 ArXiv paper (hep-ph/0309221) by Nick E. Mavromatos.
Discusses various ways in which CPT symmetry may be violated,
and their phenomenology in current or immediate future
experimental facilities, both terrestrial and astrophysical.
Considers CPT violation due to breaking of Lorentz symmetry
and some string theory models.
- The Asymmetry between Matter and Antimatter
Helen R. Quinn, Michael S. Witherell
Scientific American, October 1998, pp. 76-81
- Violations of CP (charge-parity) symmetry test the Standard
Model of particle physics and help explain the excess of matter
over antimatter in the universe.
- The Pool-Table Analogy with Axion Physics
Pierre Sikivie
Physics Today, December 1996, pp. 22-27
- An analogy illuminates the problem of CP symmetry violation
and helps explain the search for the hypothetical axion particle,
which may be a component of cosmic dark matter.
- A Flaw in a Universal Mirror
Robert K. Adair
Scientific American, February 1988, pp. 50-56
- A very slight violation of CP symmetry is known to exist, and
the existence of matter in the universe seems to depend on it.
But a deeper reason for this symmetry violation remains unknown.
- An Atomic Preference Between Left and Right
Marie-Anne Bouchiat; Lionel Pottier
Scientific American, June 1884, pp. 100-111
- It has long been known that violation of partity occurs in
particle interactions involving the weak force. The effect has
now been demonstrated at an atomic level.
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Copyright © 2002 by Charles Daney, All Rights Reserved