For which subatomic particles do we have empirical evidence?

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Discussion Overview

The discussion revolves around the empirical evidence for subatomic particles, specifically those within the standard model and beyond, including the Higgs boson and supersymmetry. Participants explore the existence of various particles, their detection, and the implications of theoretical models.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants assert that there is substantial empirical evidence for all standard model particles except the Higgs boson and the graviton.
  • References to external resources, such as the Particle Data Group and Wikipedia, are made for further information on discovered and hypothetical particles.
  • Questions are raised about the falsifiability of the Higgs boson and supersymmetry, with some arguing that they can be proven wrong through experimental evidence.
  • Participants discuss the expected energy range for the Higgs boson, noted to be between 115-185 GeV, and the implications of supersymmetry as a broken symmetry.
  • There is a discussion on how the mass of supersymmetric particles can be extended to avoid falsification, and whether similar reasoning applies to the Higgs boson.
  • One participant expresses confusion about the concepts, prompting clarifications from others.

Areas of Agreement / Disagreement

Participants generally agree on the existence of empirical evidence for many standard model particles, but there is no consensus on the status of the Higgs boson and supersymmetry, as well as the implications of their potential falsifiability.

Contextual Notes

Some discussions involve assumptions about the energy levels at which particles can be detected, and the implications of theoretical models that may not yet be empirically validated.

murshid_islam
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I have two questions: which subatomic particles do we have empirical evidence for? And which are postulated but never been detected or doesn't have any evidence yet.

Thanks in advance.
 
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I'd say we have mountains of empirical evidence for all of the particles of the standard model except the Higg's boson and the graviton.
 
Thanks a lot for your help, everyone.
 
One more question: Are the ideas that "Higgs boson exists" or "supersymmetry is a symmetry of nature" falsifiable even in principle?
 
Yes, if we don't find the Higgs Boson in it's expected energy range also with Supersymmetry. But one can always extend the energy levels on Supersymmetry.
 
Kevin_Axion said:
Yes, if we don't find the Higgs Boson in it's expected energy range also with Supersymmetry. But one can always extend the energy levels on Supersymmetry.
What is the expected energy range for Higgs boson? I didn't really understand how "supersymmetry is a symmetry of nature" is falsifiable. Sorry, I must sounds pretty dumb. But these are new stuff for me.
 
No, you don't sound dumb, you sound curious. The expected range for the Higgs Boson is between 115-185 GeV. An electro volt (eV) is the amount of energy an electron gains when accelerated through an electric potential difference of 1 volt = [tex]1.602 x 10^{-19} J[/tex]. Supersymmetry is a symmetry of nature because it states that each fermion has a corresponding boson that differs by half a unit of spin and since it is a broken symmetry they are much more massive.
 
  • #10
Kevin_Axion said:
Supersymmetry is a symmetry of nature because it states that each fermion has a corresponding boson that differs by half a unit of spin and since it is a broken symmetry they are much more massive.
If supersymmetry is false, how can we actually falsify it?
 
  • #11
It isn't false, falsifiable means it can be proven wrong through experiment. We are stll looking for Supersymmetry.
 
  • #12
Kevin_Axion said:
It isn't false, falsifiable means it can be proven wrong through experiment.
Oh yes, I know that. I just wanted to know that just in case it is false, what experiment would prove it wrong.
 
  • #13
The LHC but you can always extend the mass of supersymmetric particles as to save them from falsification.
 
  • #14
Kevin_Axion said:
The LHC but you can always extend the mass of supersymmetric particles as to save them from falsification.
What exactly did you mean by "extend the mass"?
 
  • #15
I mean the theorists can say "Well, the Supersymmetric Particles can be much more massive than what the energies can probe at the LHC."
 
  • #16
Kevin_Axion said:
I mean the theorists can say "Well, the Supersymmetric Particles can be much more massive than what the energies can probe at the LHC."
Can the same thing be said about Higgs boson? Why or why not?
 
  • #17
Possibly, but I think there is an upper-limit on the mass of the Higgs boson while supersmmetric particles don't.
 

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