is a property of a system or theory where the combined charge conjugation (replacing particles with their anti-particles) and parity (reversing the sign of every vector, equivalent to reflecting the system through the origin) operations yield non-equivalent results. Only the weak interaction is know ...
5
votes
1answer
88 views
Theta parameter of QCD: Very small, periodic in $2\pi$ or both?
I've been learning about the theta parameter of QCD and I'm confused about the fact that it's supposed to be very small but at the same time some sources say that the Yang-Mills theory should be ...
2
votes
0answers
39 views
CP-symmetry and Ward identities and finite temperature
I have a few questions about Ward-identities which I summarize here. For each I am very greateful for answers and references to literature.
Wikipedia states about Ward-identities:
The ...
3
votes
1answer
98 views
How to determine predicted CP violation for a given SUSY point?
I'm currently studying at the spectra of some supersymmetric models, and would like to know whether the parameter points I'm looking at are ruled out due to excessive CP violation.
I am using SPheno, ...
1
vote
1answer
116 views
Does the Higgs mechanism address the spin statistics problem?
Since the Higgs mechanism is so intimately tied to binding together massless chiral fermions, does it happen to have anything to say about the spin statistics issue?
I'm actually assuming the answer ...
3
votes
2answers
125 views
Do any good theories exist on why the weak interaction is so profoundly chiral?
I find the profound asymmetry in the sensitivity of left and right chiral particles to be one of the most remarkable analytical observations captured in the Standard Model. Yet for some, I've not ...
11
votes
0answers
114 views
What is the status of Witten's and Vafa's argument that the QCD vacuum energy is a minimum for zero $\theta$ angle?
The argument, which I reproduce here from Ramond's `Journies BSM', is originally by Witten and Vafa in ($\it{Phys}$. $\it{Rev}$. $\it{Lett}$. 53, 535(1984)). The argument is that for $\theta = 0 $ ...
5
votes
1answer
91 views
CP-violation in SUSY QED?
I have just gone through the exercise of constructing the supersymmetrized QED action.
In the end, I get a reasonable action which matches literature. But after a little analysis, I find that the ...
2
votes
0answers
60 views
CP-violation in weak and strong sectors
There is a possible CP-violating term in the strong sector of the standard model proportional to $\theta_\text{QCD}$. In the absence of this term, the strong interactions are CP-invariant. In the ...
1
vote
2answers
110 views
matter anti-matter world
let us suppose the gedanken experiment
a man isolated into a room he ask if he is made of matter oder of antimatter
could he set some experiments to see if he is made of matter or if he is made of ...
2
votes
1answer
360 views
Jarlskog Invariant and its mathematical origin
CP violation is present in the weak interactions if
There are no degeneracies in the up-quark/down-quark matrices
The Jarlskog invariant $J=Im(V_{us} V_{cb} V_{ub}^* V_{cs}^*)$ is nonvanishing
...
2
votes
1answer
82 views
Coefficients in V-A interaction
To account for parity violation the weak interaction matrix element is written in the form
$$
M \propto \sum_{i} C_i (\bar u_p O_i u_n) (\bar u_e O_i (1 + {{C'_i}\over{C_i}}\gamma^5)u_\nu)
$$
Why ...
1
vote
0answers
99 views
What are the prerequisites to study CP violation?
If one would like to study CP violation, what would be the prerequisites for it?
For example, until now I have not studied quantum field theory and have done very little classical field theory, but ...
4
votes
1answer
345 views
CP Violation of the CKM Matrix
Considering the relation between the $SU(2)_{WEAK}$ partners of the $|u \rangle$, $|c \rangle$, and $|t \rangle$ mass eigenstates and the corrseponding downtype eigenstates
$
\left(
...
0
votes
4answers
243 views
Would a person not be able to distinguish left from right in outer space?
Is it true that human in outer space can't differ right side and left side, with no other objects for reference?
6
votes
1answer
43 views
Which arguments for $m_u \approx 0$ are still in the market?
The RPP note on quarks masses has traditionally carried, and it is still there, the comment that
It is particularly important to determine the quark mass ratio mu/md,
since there is no strong CP ...
1
vote
1answer
259 views
Understanding P-, CP-, CPT-violation etc. in field theory and in relation to the principle of relativity
I can never get my head around the violations of $P-$, $CP-$, $CPT-$ violations and their friends. Since the single term "symmetry" is so overused in physics and one has for example to watch out and ...
2
votes
2answers
537 views
What is the correct term for the “polarity” of matter (matter vs. antimatter)? Are fractional polarities allowed?
What is the correct term for the "polarity" of matter (matter vs. antimatter)?
Are neutral polarities allowed? (1,0,-1)
Are fractional polarities allowed?
9
votes
2answers
376 views
The Ozma Problem
The "Ozma problem" was coined by Martin Gardner in his book "The Ambidextrous Universe", based on Project Ozma. Gardner claims that the problem of explaining the humans left-right convention would ...
5
votes
1answer
142 views
Why is the decay of neutral kaons (violates CP invariance) seemingly not sufficient enough for certain people to describe matter-antimatter imbalance?
The Nobel Prize in Physics in 1980 was awarded to James Cronin and Val Fitch for their discovery of a violation of Charge and Parity Invariance, in which the neutral kaon's quarks change into their ...
2
votes
1answer
187 views
Does kaon decay etc prove “CP violation” or just “CP or CPT violation”
Shlomo Sternberg (math professor at Harvard) wrote a book called "Group theory and physics". On p156 (link) there's a strange offhand comment:
"Experiments done in 1964 by Fitch and Cronin seem to ...
6
votes
4answers
352 views
Matter-Antimatter Asymmetry in Experiments?
As I hope is obvious to everyone reading this, the universe contains more matter than antimatter, presumably because of some slight asymmetry in the amounts of the two generated during the Big Bang. ...
2
votes
1answer
211 views
How much CP violation does the weak force cause?
I'm looking for the most readable quantitative explanation, with the least amount of difficult mathematics. Rather than an answer with just a number, I'd like to see the derivation from the CKM ...
1
vote
2answers
249 views
Is there a relationship between Berry-Pancharatnam phase and CP violation in quark mixing?
Berry-Pancharatnam phase is the phase that quantum systems exhibit when they pass through a sequence of states and return to their original state. It's a complex phase and it is different from the ...
