Why doesn't pdg baryon list show quark compositions?

In summary, the conversation discusses the absence of quark compositions and electrical charges in the PDG baryons list. The conversation touches upon the example of Roper resonances and how the quark content is given in the PDG booklet and website. It is mentioned that the primary purpose of the Review of Particle Properties is not outreach and the quark content can be found in the heading of the section or at the top of the PDG Live page for a specific particle. The naming scheme for hadrons is also explained as a way to encode quark content. The conversation concludes with the understanding that the PDG list is primarily meant for professional particle physicists.
  • #1
Garlic
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Why doesn't pdg baryons list show the quark compositions and electrical charges?
For example, there is only one roper resonance entry, but there are two roper resonances with different quark compositions (although they have the same mass), why not list all the variations?
 
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  • #2
Usually the quark content is given, or should be clear from the context. Example. What is a "roper resonance"?
 
  • #4
The quark content is given there, right above the large bold N(1440).
 
  • #5
I was looking in the pdf booklet for nucleon-nucleon resonances. Here is a screenshot of it:
Roper.png

Okay, it seems that they don't write quark compositions only in pdf booklets.
 
  • #6
Ah, hmm. pdgLive has it, and I rarely use the printed version.
 
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  • #7
In the PDG Booklet (and also the Review) the quark content is listed in the heading for the section. The N BARYONS heading is about 3 pages before the N(1400) listing.

Similarly the quark content for say the ##\Delta## BARYONS is listed in that heading a couple of pages later.
 
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  • #8
Garlic, the primary purpose of the Review of Particle Properties is not outreach. It may not be suited for what you want - but that's not its job. It seems a bit unfair to complain that a tool for professional particle physicists is not as helpful to people who are not professional particle physicists.

Also, the quark content is given at the top of the PDFLive page for the N(1440). It seems a bit unfair to complain that a tool for professional particle physicists has the information, but not where you looked for it.

Finally, Section 8, "Naming scheme for hadrons" explains how the N in N(1440) encodes the quark content. It's Rule 1 in Section 8.4.
 
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  • #9
Vanadium 50 said:
It seems a bit unfair to complain

I wasn't complaining, I just couldn't understand why the list diddn't show quark compositions.
 
  • #10
Because professional particle physicists know the quark composition from the name.
 
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1. Why do some baryons have strange quark compositions in the PDG list?

This is because the quark compositions listed in the PDG (Particle Data Group) baryon list are only the most commonly observed combinations. Baryons can have various combinations of quarks, including strange quarks, but they may not be as frequently observed in experiments.

2. How accurate are the quark compositions listed in the PDG baryon list?

The quark compositions listed in the PDG baryon list are based on experimental data and theoretical predictions. However, they are constantly being updated and refined as new experiments and discoveries are made. Therefore, the accuracy of these compositions may vary.

3. Why are some baryons listed with a range of possible quark compositions?

Some baryons may have a range of possible quark compositions because their exact quark structure is still being studied and debated in the scientific community. As more data and evidence is collected, the range may become narrower and the composition more precise.

4. Can baryons have more than three quarks in their composition?

Yes, baryons can have more than three quarks in their composition. These are known as exotic baryons and are still being studied and confirmed by experiments. Some examples include pentaquarks, which have five quarks, and tetraquarks, which have four quarks.

5. Are there any baryons with only two quarks in their composition?

No, baryons must have at least three quarks in their composition in order to be classified as a baryon. Baryons are made up of three valence quarks, which are the main building blocks of matter, and can also have additional virtual quarks and gluons that contribute to their properties.

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