Questions tagged [pentaquarks]
The pentaquarks tag has no usage guidance.
11
questions
2
votes
1answer
53 views
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?
3
votes
0answers
42 views
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
votes
0answers
53 views
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
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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,...
