Questions tagged [pentaquarks]
17 questions
8
votes
1 answer
"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 "unaccounted for" $u\bar{u}$ pair that seems to…
user86859
- 83
7
votes
1 answer
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 quarks and one down quark”, is really a statement…
Dt roid
- 199
7
votes
1 answer
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?
random user
- 189
6
votes
4 answers
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 configuration is just for show, what is the…
3
votes
1 answer
Could a $uuuu\bar{u}$ pentaquark exist?
Could a $uuuu\bar{u}$ pentaquark exist or is it forbidden due to Pauli exclusion principle?
user9867
- 221
3
votes
1 answer
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?
A.Sa
- 161
3
votes
0 answers
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 transformed into many pairs of quarks or even a…
user6760
- 13,214
3
votes
0 answers
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 nucleus (separate protons and neutrons) together…
user52592
3
votes
1 answer
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 consisting of three quarks with color quantum no.…
physics101
- 332
2
votes
1 answer
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,...) like tetraquarks, pentaquarks,...or even…
riemannium
- 6,843
2
votes
2 answers
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 representations of color $SU(3)$, the five quark…
asperanz
- 4,538
1
vote
0 answers
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 could such a particle last?
Rick
- 2,764
0
votes
2 answers
Could a particle with 4+ quarks exist and stay stable long enough to be observed?
we know baryons like protons and neutrons have 3 quarks ($uud$ & $udd)$ and mesons like pions and kaons have a quark + its respective antiquark, but could there theoretically be a particle with four or more quarks/antiquarks?
how long would it stay…
styx
- 11
0
votes
0 answers
Isospin multiplet for a given pentaquark
Considering the pentaquark $P = (uudt\bar{c})$, with orbital angular momentum $L = 0$, and assuming a space-spin wavefunction that corresponds to the maximum-J state, I want to know the isospin multiplet to which $P$ belongs.
First of all, the…
user9867
- 221
0
votes
1 answer
Q\Quark Formation of the Latest Tetraquark
I was recently reading an article about a tetraquark combo TCC+ that was found and measured. The pic in the article looks wrong to me. It shows C antiU on top and a C antiD on the bottom. I know it is only an artist depiction, but to me it would…
Rick
- 2,764