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Questions tagged [quarks]

The quark model postulates that the hadrons such as protons and neutrons have an inner structure; quarks.

The quark model postulates that the hadrons such as protons and neutrons have an inner structure; quarks.

There are three generations of quarks and two types in generation. Their interaction through the strong force constructs hadrons. The study of the strong interaction of quarks and gluons belongs to , and of course, the (which includes QCD).

Quarks are .

790 questions
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Do quarks really exist?

Title says it all. Have they been seen in experiment or are they just theoretical things? Do quarks really exist?
user28936
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What evidence is there of the existence of quarks?

What is the experimental evidence that suggests the existence of quarks? How were they discovered? I'm going to assume a particle collider is involved, as it tends to be the case with most subatomic discoveries these days. How are we able to study…
Bassinator
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How do quarks keep themselves apart?

I was chatting with user Dan Yand regarding my recent question about colour charges, it was mentioned in the comment section that particles with colour charges attract each other like or unlike hence I would like to know how do quarks keep…
user6760
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Counting the number of quarks

How many quarks must I distinguish? They come in 6 flavors. But each has an antiquark so that would be 12. Electron and positron are also particle and anti-particle and are considered as different particles. There only difference, as far as I am…
Gerard
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Experimental evidence for quarks via Electron-Positron Annihilation - Antiquarks?

According to (for example) this document in calculating $R$ as the sum of charges squared, you get 11/9 for u, d, s, c and b quarks, which you multiply by 3 to factor in the 3 colors. Wouldn't you expect an additional factor of 2 to account for…
qatch
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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?
Somdatta Bhattacharya
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What is the motion of quarks inside nucleons?

Nucleons consist of quarks which are charged particles. Proton has the quark content of uud and neutron of udd. So, it may be visualized that the down quark always remain between the up quarks inside proton and the up quark remains between the down…
Subhra
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Could the values of the CKM matrix be determined from the quark masses?

It seems like the values of the CKM matrix are somewhat related to the masses of the quarks. For example, the heavier the quark the less likely it is to change into another quark in a weak interaction. For example if $m_i$ are the masses of the…
user84158
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Sea of quarks-antiquarks-gluons? or a pond?

Please tell me where I go wrong in my understanding: If the valence quarks-gluons male up 1,5 % of total mass how can the remaining so-called sea contain "innumerable" virtual particles? At most there should be 80 times the valence quarks, which…
user157860
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Why is the sum of quarks in proton anti-proton annihilation different in the produced mesons?

The proton anti-proton annihilation at Wikipedia describes the process as not as simple as the electron-positron annihilation. Especially it states: Reactions in which proton-antiproton annihilation produces as many as nine mesons have been…
Johannes Maria Frank
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Spatial configuration of quarks?

Is there anything known about the spatial configuration of the quarks within a proton of pion? Or are they just considered to be two or three overlapping points?
Gerard
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Ontology of quarks: Is everything composed of quarks? If not, then why not?

I am currently researching the nature of interactions in philosophy. I am a novice to physics and am here to learn about the latest developments in physical sciences. What do quarks need to exist? What are their conditions of existence? Which I…
Sahana Rajan
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Quarks, and their effects

Can someone explain to me the physical effect of quarks on matter, and what each different quark does compared to the other?
Theoretically Alexx
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