The quarks tag has no wiki summary.
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Possible implications of Quark Quartet
Today on Nature's website appeared a news about the discovery of a quark quartet (formed from two quarks and two antiquarks). They say that this particle containing four quarks is confirmed. This is ...
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0answers
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Why aren't there more than three generations of the leptons and quarks? [duplicate]
There are three generations of electrons, neutrinos, and quarks. The second and third generations of electrons and quarks are unstable and decay into lighter particles.
Why are there exactly three ...
2
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2answers
150 views
Is there anything smaller than a quark? [duplicate]
I've gotten interested in physics recently due to the many educational channels on YouTube such as sixtysymbols and minutephysics. They talk about quarks sometimes, and I was wondering if there is ...
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2answers
63 views
Dirac magnetic monopoles and quark fractional electric charge quantization
When applying the Dirac quantization rule for electric and magnetic charge, I assume one is considering unit electric charges such as electrons. How does the Dirac quantization rule apply for the ...
3
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1answer
40 views
What is the $t\bar{t}$ production supposed to bring up
The $t\bar{t}$ production, I've read, that will somehow confirm the QCD and might bring up new physics. Why are we studying $t\bar{t}$ production from $p-p$ collisions at the LHC?
What are we trying ...
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Does fractal geomtry suggest there is no smallest object?
Does fractal geometry prove that there is no such thing as the smallest object and that all atoms, particles, quarks, or bosons can continue to be broken down to infinity.
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1answer
50 views
Quarks and anti-quarks forming particles [duplicate]
As I know, when particles and anti-particles come close, they anihilate. So somthing caused me a big trouble : how can particle formed by quarks and anti-quarks can exist? I've just found some mesons ...
4
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1answer
91 views
Asymptotic Freedom - Qualitative Explanation
I am doing a (mostly qualitative) course on Particle Physics, and am confused about the concept of asymptotic freedom. The lecture notes basically say that a quark may experience no force/be "unbound" ...
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1answer
70 views
Baryon wave function symmetry
If a baryon wavefunction is $\Psi = \psi_{spatial} \psi_{colour} \psi_{flavour} \psi_{spin}$,
and we consider the ground state (L=0) only.
We know that the whole thing has to be antisymmetric under ...
4
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1answer
85 views
Why is a pion so light compared to a neutron or proton?
A pion is made out of a pair of up and/or down quarks. A neutron or proton is three up or down quarks. So naively I'd expect a pion to be about 2/3 the mass of a nucleon.
In fact it's less than 1/6 ...
10
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1answer
143 views
Magnetic monopoles
I am a non-expert in this field, just have a layman's interest in the subject. Has anyone ever considered the possibility of magnetic monopoles (one positive and one negative charge) being confined ...
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0answers
26 views
What is the process that gives quarks fractional electric charge? [duplicate]
I've heard always that quarks has fractional electric charge, How do we know that quarks has fractional electric charge?
what is the process that gives quarks its fractional electric charge?
Ok ...
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2answers
118 views
Second baryon octet
Let's temporarily ignore spin. If 3 denotes the standard representation of SU(3), 1 the trivial rep, 8 the adjoint rep and 10 the symmetric cube then it's well-known that
3 x 3 x 3 = 1 + 8 + 8 + 10
...
4
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3answers
135 views
How quark electric charge directly have been measured?
How quarks electric charge directly have been measured when quarks never directly observed in isolation? (Due to a phenomenon known as color confinement.)
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1answer
94 views
Facts About Quarks Electric Charge [duplicate]
Quarks have the unusual characteristic of having a fractional electric charge.
here there is a new model that suggests maybe an up Quark has no electric charge and infact down Quark has electric ...
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1answer
64 views
What would be the effect of an excess of up quarks on stellar formation?
Suppose you had 80% up quarks, and only 20% down quarks. How would this affect stellar formation?
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2answers
164 views
So there are 6 quarks, what are anti-quarks considered then?
I just recently got into particle physics and the quantum world and I love it.
So my first big question is.
I watch all these videos and people explain the quarks (up, down, top, bottom, strange, ...
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0answers
72 views
Are quarks the limits? The end of the fundamental science. For collisions on more higher energies will lead to black holes after all?
Are quarks the limit and the Plank scale is believed to be the limit of distance when the very concept of space and length cease to exist (10^-19)
Any attempt to research the existence of shorter ...
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0answers
107 views
Strong decays of baryons via quark-antiquark pairs
I have the doubly charmed $\Xi_{cc}^{++}$ consisting of ccu quarks.
This is meant to decay via strong force, producing a light baryon (cud/uuc/udc etc...) and a quark-antiquark pair along with a ...
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1answer
62 views
The fractional model of Quarks electric charge was found before discovery of the $\Delta^{++}$, or after it?
From Wikipedia:
Existence of the $\Delta^{++}$ , with its unusual +2 electric charge, was a crucial clue in the development of the quark model.
the fractional model of Quarks electric charge was ...
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2answers
111 views
What is mass of free up and down Quark?
Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. Due to a phenomenon known as color confinement, quarks ...
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2answers
250 views
What IS Color Charge?
This question has been asked twice already, with very detailed answers. After reading those answers, I am left with one more question: what is color charge?
It has nothing to do with colored light, ...
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2answers
81 views
What reason(s) exist to suppose that all degeneracy pressures can be overcome in Black-Hole formation?
In models of stellar collapse to a black hole, it is a given that density increases without bound towards a singularity. Electron degeneracy I get. Neutron degeneracy I get. I assume there's some ...
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1answer
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A strange particle, $X$, decays in the following way: $X → π^– + p$. State what interaction is involved in this decay
A strange particle, $X$, decays in the following way: $X → π^– + p$. State what interaction is involved in this decay.
I know the answer to be weak interaction, but why is it weak interaction? What ...
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1answer
57 views
Measuring nucleons using electron beams
sorry if the question is too elementary. From: The Britannica Guide to Particle Physics:
The sizes of atoms, nuclei, and nucleons are measured
by firing a beam of electrons at an appropriate target. ...
6
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3answers
200 views
Origin of lepton/quark generations?
What theoretical explanations exist for the fact that there are three generations of leptons and quarks?
I'm not so much asking why there are exactly 3 generations, but rather what makes electron, ...
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2answers
231 views
About free quarks and confinement
I simply know that a single free quark does not exist. What is the reason that we can not get a free quark?
If we can't get a free quark then what is single-top-quark?
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1answer
265 views
Why isn't Hydrogen's electron pulled into the nucleus? [duplicate]
Possible Duplicate:
Why do electrons occupy the space around nuclei, and not collide with them?
Why don’t electrons crash into the nuclei they “orbit”?
From what I learned in chemistry, ...
4
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1answer
300 views
How does Delta baryon decay conserve angular momentum?
I'm a chemist so bear with me:
I understand the Delta baryons $\Delta^{+}$ and $\Delta^{0}$ to be in some sense spin (and isospin) quartet states of the proton and neutron. These can decay straight ...
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1answer
91 views
$sss$ decay and violation of strangeness
Why can the hyperon $\Omega^{-}$ not decay by strong interaction? It seems that strangeness must be violated, but why is it the only way?
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2answers
260 views
Quark compositions in $\pi^+$ to $\pi^0$ pion decay
Pions can undergo a rare beta-like decay into leptons:
Pion beta decay (with probability of about $10^{−8}$) into a neutral
pion plus an electron and electron antineutrino (or for positive
...
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2answers
250 views
Cramer's rule, Origin of Quarks Fractional electric charge? [closed]
In linear algebra, Cramer's rule is an explicit formula for the solution of a system of linear equations with as many equations as unknowns.
2u+1d=1
1u+2d=0
$$a_1d+b_1u=c_1$$ $$a_2d+b_2u=c_2$$ ...
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1answer
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Pion Decay and Fractional electric Charge disappeared, why?
Since the charged pions decay into two particles, a muon and a muon neutrino Fractional electric Charge disappeared, why?
The decay proceeds by the weak interaction $W^{+}$ and can be visualized in ...
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2answers
462 views
Could the fractional model of Quarks electric charge turn out to be false? [closed]
The delta baryons (also called delta resonances) are a family of subatomic hadron particles which have the symbols $\Delta^{++}$, $\Delta^{+}$, $\Delta^{0}$, and $\Delta^{−}$ and electric charges +2, ...
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1answer
201 views
What was the first discovery of the delta baryon $\Delta^{++}$?
The delta baryons (also called delta resonances) are a family of subatomic hadron particles which have the symbols $\Delta^{++}$, $\Delta^{+}$, $\Delta^{0}$, and $\Delta^{−}$ and electric charges +2, ...
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1answer
272 views
What is the relationship between the Higgs field and quarks?
I have some difficulty considering the relative size of each and the meaning behind the shape of Higgs boson. I ask relating to the structures of both the Higgs field and quarks. How is it that the ...
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5answers
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Could Quark model turn out to be false?
Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei.
Due to a phenomenon known as color confinement, quarks ...
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1answer
103 views
Relating theta_QCD to neutron EDM
How do I relate the topological $\theta_\text{QCD}$ parameter to the electric dipole moment (EDM) of the neutron?
I am very familiar with chiral perturbation theory. I just need to know how to take ...
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3answers
84 views
Top quark production questions
I am just looking on the TopQuark production via proton antiproton collision and strong interaction. There seem to be three basic possibilities.
$q + \bar q \rightarrow Gluon \rightarrow t +\bar t ...
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1answer
328 views
Quark Radius Upper Bound
If quarks had internal structure (contradicting current beliefs), what is the lowest
upper bound on their "radius" based on current experimental results?
If possible, I'd prefer to only consider ...
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1answer
90 views
Could quarks and leptons mix if they carried flavor charges?
If quarks and leptons carried flavor charges that differed across generations (as they do in some theories), then could mixing take place?
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2answers
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If quarks didn't have mass, could protons (and neutrons) exist?
I read here (mass of a proton) that the mass of a proton is mostly (99%) due to the energy of the strong nuclear force which binds the quarks together, and not the actual mass of the quarks. My ...
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2answers
150 views
How can a pion have a mass, given it's a “field mediator” and created/destroyed continuously?
Maybe some of my assumptions here are basically wrong, but isn't it true that
pion is the "mediator" for the strong force field.
the quantum field theory basically says that there are no fields, ...
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1answer
76 views
Future of colliders and technical limitations
Are there any technical limitations (theoretical or technological) that prevent quark based colliders? ie. Colliding two quarks together.
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4answers
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Could the Periodic Table have been done using group theory?
These three questions are phrased as alternative-history questions, but my real intent is to understand better how well different modeling approaches fit the phenomena they are used to describe; see 1 ...
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1answer
88 views
Is there a tb meson?
I was wandering around the particle date group page for meson and couldn't find a meson for top-bottom, which from symmetry you would expect.
Q1: Is this because it hasn't been found?
Q2: There is ...
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1answer
132 views
Particle mixing and indistinguishability
Neutral kaons have two flavor combinations: $\mathrm{d}\bar{\mathrm{s}}$ and $\mathrm{s}\bar{\mathrm{d}}$. They can also be weak eigenstates: $\mathrm{\frac{d\bar{s} \pm s\bar{d}}{\sqrt{2}}}$.
But ...
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2answers
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What is the interaction with Higgs field(s) that give the quarks so much different masses?
The masses of quarks are:
mu 2∼3 MeV md 4∼6 MeV
mc 1.3 GeV ms 80∼130 MeV
mt 173 GeV mb 4∼5 GeV
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2answers
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Neutrino oscillations versus CMK quark mixing
I wish to describe in simple but correct terms the analogy between the Cabibbo–Kobayashi–Maskawa (CMK) and Pontecorvo–Maki–Nakagawa–Sakata (PMNS) matrices.
The CMK matrix describes the rotation ...
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4answers
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Why do electron and proton have the same but opposite electric charge?
What is the explanation between equality of proton and electron charges (up to a sign)? This is connected to the gauge invariance and renormalization of charge is connected to the renormalization of ...
