Questions tagged [pentaquarks]

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How and why is the pentaquark stable if it consists of 4 quarks and an antiquark?

If matter and antimatter annihilate each other, why is the pentaquark stable since quarks are matter and the antiquark is antimatter?
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0answers
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How many antiquarks can be squeezed inside a nucleon without upsetting exclusion principle?

I read about a nucleon with 3 Strange quarks which clearly violates PEP, however this was soon resolved by introducing colour charges. Then I read about colour confinement where surplus energy can be ...
2
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0answers
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Pentaquark found in LHC

Good Afternoon, So one of the 2 pentaquarks possibly found in the LHC was U,U,D,C,-C My question is that wouldn't the C/-C annihilate each other almost immediately, leaving the U,U,D? How long ...
3
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0answers
218 views

Protons and Neutrons inside the Nucleus

I know that the strong nuclear force holds quarks together to form protons and neutrons, as long as their color charges add up to white, so then how does the strong force simultaneously hold the ...
5
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1answer
202 views

What's the difference between a pentaquark and a proton?

The proton isn't just 3 quarks bound by gluons: From here, a proton also has an uncountable lot of sea quarks, antiquarks and gluons and that The standard shorthand, “the proton is made from two up ...
7
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1answer
176 views

“Unaccounted for” vertices in certain Feynman diagrams?

I'm looking to understand where certain "unexplained" vertices in some Feynman diagrams come from, in a physical sense. For example, in the top figure (Aaij et al. 2015), in diagram (b), there is an "...
7
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1answer
261 views

What does the discovery of a pentaquark signify?

at a particle collider a pentaquark was discovered. My question in short is what does the discovery of a pentaquark signify? Is there a theory that it supports or something like that?
3
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2answers
223 views

Quark model in particle physics; is it possible for a particle to exist with five or seven quarks?

As we all know that baryons are made up of three quarks while mesons are made up of a quark and an anti-quark. Is it possible for a particle to exist with five or seven quarks? Can a particle exist ...
6
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3answers
375 views

The Makeup of the Pentaquark

Why is it that when they have the artist's rendition of the Pentaquark it shows two downs, two ups, and one anti-strange quark? Is this or is this just for show? Follow up to this question: if this ...
2
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2answers
342 views

Pentaquark spin prediction

Is there a straightforward way to see what the spin of the recently-discovered pentaquark states should be, from the representation theory of $SU(3)\times SU(2)\subset SU(6)$? I can see that from the ...
2
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1answer
180 views

Multiquark states and molecular QCD

Due to some recent "discoveries" (yet to be completely confirmed), we have hinted the existence of tetraquark particles. Why QCD exotics like multiquark states beyond n=2,3 (mesons, protons,neutrons,...