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CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Fri Jun 18, 2021 6:46 pm
by notFritzArgelander

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sat Jun 19, 2021 7:45 pm
by GCoyote
Would this be another minor addition to the Standard Model or open the door to something significant?

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sat Jun 19, 2021 9:21 pm
by notFritzArgelander
GCoyote wrote: Sat Jun 19, 2021 7:45 pm
Would this be another minor addition to the Standard Model or open the door to something significant?
Interesting question. It caused me to think about calibrating SM extensions.

When I think of minor additions to the Standard Model I think of the dark matter candidates like axions, WIMPs, WIMPzillas, sterile neutrinos, etc.

For a major extension of the SM, I can think of only one item: a quantum gravity.

Leptoquarks are less than major but more than minor since they are such odd things. https://en.wikipedia.org/wiki/Leptoquark

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 12:29 pm
by GCoyote
Interesting, thanks!

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 3:39 pm
by turboscrew
"Leptoquarks are color-triplet bosons that carry both lepton and baryon numbers."
Weird things, indeed.
Kind of brought the light wave/particle duality in mind. But colour-triplet?

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 4:27 pm
by GCoyote
Yeah, it is definitely messy. Did you see this a few weeks ago?

https://www.quantamagazine.org/a-new-ma ... -20201022/

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 4:59 pm
by turboscrew
GCoyote wrote: Sun Jun 20, 2021 4:27 pm Yeah, it is definitely messy. Did you see this a few weeks ago?

https://www.quantamagazine.org/a-new-ma ... -20201022/
"Strangely, there are no right-handed W bosons in nature." :shock:
Had to bookmark the page.

I never really got a grip of weak interaction. The other interactions form "force fields". I think weak does not?

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 7:40 pm
by notFritzArgelander
turboscrew wrote: Sun Jun 20, 2021 3:39 pm "Leptoquarks are color-triplet bosons that carry both lepton and baryon numbers."
Weird things, indeed.
Kind of brought the light wave/particle duality in mind. But colour-triplet?
Quarks are color triplets (3 colors) with baryon and without lepton number.
Leptons are color singlets (0 colors, but technically a color singlet state) without baryon and with lepton number.
Leptoquarks are color triplets with both baryon and lepton number.

Does that help, I hope?

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 7:46 pm
by notFritzArgelander
turboscrew wrote: Sun Jun 20, 2021 4:59 pm
GCoyote wrote: Sun Jun 20, 2021 4:27 pm Yeah, it is definitely messy. Did you see this a few weeks ago?

https://www.quantamagazine.org/a-new-ma ... -20201022/
"Strangely, there are no right-handed W bosons in nature." :shock:
Had to bookmark the page.

I never really got a grip of weak interaction. The other interactions form "force fields". I think weak does not?
Weak does form force fields but the range over which the force is appreciable is quite short. Because the W and Z bosons which carry the force are so massive the range is very short. Here's a link to the Yukawa potential which details how this works. https://en.wikipedia.org/wiki/Yukawa_potential

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 7:47 pm
by notFritzArgelander
GCoyote wrote: Sun Jun 20, 2021 4:27 pm Yeah, it is definitely messy. Did you see this a few weeks ago?

https://www.quantamagazine.org/a-new-ma ... -20201022/
That article slipped past me. Thanks!

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 8:46 pm
by turboscrew
notFritzArgelander wrote: Sun Jun 20, 2021 7:40 pm
turboscrew wrote: Sun Jun 20, 2021 3:39 pm "Leptoquarks are color-triplet bosons that carry both lepton and baryon numbers."
Weird things, indeed.
Kind of brought the light wave/particle duality in mind. But colour-triplet?
Quarks are color triplets (3 colors) with baryon and without lepton number.
Leptons are color singlets (0 colors, but technically a color singlet state) without baryon and with lepton number.
Leptoquarks are color triplets with both baryon and lepton number.

Does that help, I hope?
Ah, the "triplet" means that. I thought it meant that one leptoquark could have three colours, but it can have one of the three possible colours.

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 9:17 pm
by turboscrew
notFritzArgelander wrote: Sun Jun 20, 2021 7:46 pm
turboscrew wrote: Sun Jun 20, 2021 4:59 pm
GCoyote wrote: Sun Jun 20, 2021 4:27 pm Yeah, it is definitely messy. Did you see this a few weeks ago?

https://www.quantamagazine.org/a-new-ma ... -20201022/
"Strangely, there are no right-handed W bosons in nature." :shock:
Had to bookmark the page.

I never really got a grip of weak interaction. The other interactions form "force fields". I think weak does not?
Weak does form force fields but the range over which the force is appreciable is quite short. Because the W and Z bosons which carry the force are so massive the range is very short. Here's a link to the Yukawa potential which details how this works. https://en.wikipedia.org/wiki/Yukawa_potential
It looks like Yukawa-potential is more like an abstract construct that fits, at least, to electromagnetic interaction and weak interaction, but I still have no clue, what's the "charge" in weak interaction. I've searched that around the internet before, but I haven't seen much else but that weak interaction "affects some decays". I guess the "charge" with Yukawa-potential might, together, bring _some_ light to this?

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Sun Jun 20, 2021 9:54 pm
by notFritzArgelander
turboscrew wrote: Sun Jun 20, 2021 9:17 pm
notFritzArgelander wrote: Sun Jun 20, 2021 7:46 pm
turboscrew wrote: Sun Jun 20, 2021 4:59 pm

"Strangely, there are no right-handed W bosons in nature." :shock:
Had to bookmark the page.

I never really got a grip of weak interaction. The other interactions form "force fields". I think weak does not?
Weak does form force fields but the range over which the force is appreciable is quite short. Because the W and Z bosons which carry the force are so massive the range is very short. Here's a link to the Yukawa potential which details how this works. https://en.wikipedia.org/wiki/Yukawa_potential
It looks like Yukawa-potential is more like an abstract construct that fits, at least, to electromagnetic interaction and weak interaction, but I still have no clue, what's the "charge" in weak interaction. I've searched that around the internet before, but I haven't seen much else but that weak interaction "affects some decays". I guess the "charge" with Yukawa-potential might, together, bring _some_ light to this?
Ah, but the the weak interaction DOES involve weak charge that is analogous to electrical charge. Here's how it's calculated in the Standard Model: https://en.wikipedia.org/wiki/Weak_charge

The vector bosons that "carry" the force are often uncharged, the photon in the EM interaction, the gluon in the strong interaction. The weak interaction has two vector bosons, the W and Z. The Z is electrically uncharged and the W is electrically charged. So the former is responsible for "neutral current" weak interactions and the W does "charged current" weak interactions.

https://en.wikipedia.org/wiki/Charged_current
https://en.wikipedia.org/wiki/Neutral_current

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Mon Jun 21, 2021 3:36 am
by turboscrew
notFritzArgelander wrote: Sun Jun 20, 2021 9:54 pm
turboscrew wrote: Sun Jun 20, 2021 9:17 pm
notFritzArgelander wrote: Sun Jun 20, 2021 7:46 pm

Weak does form force fields but the range over which the force is appreciable is quite short. Because the W and Z bosons which carry the force are so massive the range is very short. Here's a link to the Yukawa potential which details how this works. https://en.wikipedia.org/wiki/Yukawa_potential
It looks like Yukawa-potential is more like an abstract construct that fits, at least, to electromagnetic interaction and weak interaction, but I still have no clue, what's the "charge" in weak interaction. I've searched that around the internet before, but I haven't seen much else but that weak interaction "affects some decays". I guess the "charge" with Yukawa-potential might, together, bring _some_ light to this?
Ah, but the the weak interaction DOES involve weak charge that is analogous to electrical charge. Here's how it's calculated in the Standard Model: https://en.wikipedia.org/wiki/Weak_charge

The vector bosons that "carry" the force are often uncharged, the photon in the EM interaction, the gluon in the strong interaction. The weak interaction has two vector bosons, the W and Z. The Z is electrically uncharged and the W is electrically charged. So the former is responsible for "neutral current" weak interactions and the W does "charged current" weak interactions.

https://en.wikipedia.org/wiki/Charged_current
https://en.wikipedia.org/wiki/Neutral_current
So I can think of a kind of "vector charge" where one component is electric charge and the other part is weak charge?
Maybe I should read about isospin first?

Re: CERN: Leptoquarks, the Higgs boson and the muon’s magnetism

Posted: Mon Jun 21, 2021 4:02 am
by notFritzArgelander
turboscrew wrote: Mon Jun 21, 2021 3:36 am
notFritzArgelander wrote: Sun Jun 20, 2021 9:54 pm
turboscrew wrote: Sun Jun 20, 2021 9:17 pm
It looks like Yukawa-potential is more like an abstract construct that fits, at least, to electromagnetic interaction and weak interaction, but I still have no clue, what's the "charge" in weak interaction. I've searched that around the internet before, but I haven't seen much else but that weak interaction "affects some decays". I guess the "charge" with Yukawa-potential might, together, bring _some_ light to this?
Ah, but the the weak interaction DOES involve weak charge that is analogous to electrical charge. Here's how it's calculated in the Standard Model: https://en.wikipedia.org/wiki/Weak_charge

The vector bosons that "carry" the force are often uncharged, the photon in the EM interaction, the gluon in the strong interaction. The weak interaction has two vector bosons, the W and Z. The Z is electrically uncharged and the W is electrically charged. So the former is responsible for "neutral current" weak interactions and the W does "charged current" weak interactions.

https://en.wikipedia.org/wiki/Charged_current
https://en.wikipedia.org/wiki/Neutral_current
So I can think of a kind of "vector charge" where one component is electric charge and the other part is weak charge?
Maybe I should read about isospin first?
Isospin is a good place to start historically. It led to thinking about charged and neutral currents in the weak interaction.