Elementary Particles

  • #1

Main Question or Discussion Point

How many elementary particles have been discovered.
 

Answers and Replies

  • #2
887
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please see http://pdg.lbl.gov/pdg.html

There are 6 different quarks, 6 different leptons, and 12 different gauge bosons. Then you have all the antiparticles for these different particles. This is in regards to the standard model of particle physics. Please see the link above for much more detail.
Cheers,
Ryan
 
  • #4
arivero
Gold Member
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Norman said:
please see http://pdg.lbl.gov/pdg.html

There are 6 different quarks, 6 different leptons, and 12 different gauge bosons. Then you have all the antiparticles for these different particles. This is in regards to the standard model of particle physics. Please see the link above for much more detail.
Cheers,
Ryan
I love this question, because if you go into details... how should you count the particles? It seems that for fermions it is a question of mass, if the mass is the same you consider it to be the same particle, even if the charge is not. But for bosons we count W+ and W- as two particles.

If we include charge and antiparticles in the fermions, we have

6*3*2= 36 quarks and
6*2= 12 leptons

If we consider Parity, we have
36*2= 72 quarks
12*2= 24 leptons, or we had 18 if there were not right neutrinos.

thus about 96 "particles".
 
  • #5
dlgoff
Science Advisor
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Last edited by a moderator:
  • #6
Astronuc
Staff Emeritus
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  • #7
887
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arivero said:
I love this question, because if you go into details... how should you count the particles? It seems that for fermions it is a question of mass, if the mass is the same you consider it to be the same particle, even if the charge is not. But for bosons we count W+ and W- as two particles.

If we include charge and antiparticles in the fermions, we have

6*3*2= 36 quarks and
6*2= 12 leptons

If we consider Parity, we have
36*2= 72 quarks
12*2= 24 leptons, or we had 18 if there were not right neutrinos.

thus about 96 "particles".
This is very true... I struggled with whether or not to mention these points. But I decided to go with just what I stated for brevity, and simplicity. I had the chart that dlgoff mentioned in mind when I posted this... But a really good question is, why don't we explain from the beginning that there are 3 different color charges of quarks? I think the answer lies in the color neutrality of hadrons. But I agree, as usual the devil is in the details! :devil:
Cheers,
Ryan
 

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