# Standard Model (Forces interacting with Matter)

Not the best at physics but trying to understand the standard model. So can someone please tell me if this is right or not and if not, can you explain me why?

Higgs bosons reacts with everything that has mass.
Electromagnetic force reacts with everything that has charge.
Weak force reacts with everything that has spin.
Strong force reacts with everything that has color.

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mfb
Mentor
Electromagnetic force reacts with everything that has charge.
Electric charge.
Weak force reacts with everything that has spin.
No. Gluons and photons have spin 1, for example. The weak interaction interacts with everything that has a weak charge, which happens to be every particle apart from gluons, photons and Higgs bosons. For the interaction between Higgs bosons and W/Z it is unclear if you want to call that a weak interaction or an interaction of the Higgs.

So
Higgs bosons reacts with everything that has mass.
Electromagnetic force reacts with everything that has electric charge.
Weak force reacts with everything that has weak hypercharge.
Strong force reacts with everything that has color.

If it would react to everything that has a weak hypercharge than it should also react to the Higgs boson because its weak hypercharge is +1.

And yes I ment electric charge.

Orodruin
Staff Emeritus
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Weak force reacts with everything that has weak hypercharge.
This is not really true either. The currents coupling to W and Z bosons are rather complicated. Weak hypercharge is the unbroken U(1) above electroweak symmetry breaking. Z bosons couple to a linear combination of weak hypercharge and the third component of weak isospin. W bosons only couple to left-handed particles as they belong purely to the standard model SU(2), which is chiral.

Edit: Also, I would suggest learning the standard model from the basic gauge interactions rather than trying to learn it in terms of a mantra on the form "this interacts with that".

dlgoff
Not the best at physics but trying to understand the standard model. So can someone please tell me if this is right or not and if not, can you explain me why?

Higgs bosons reacts with everything that has mass.
Electromagnetic force reacts with everything that has charge.
Weak force reacts with everything that has spin.
Strong force reacts with everything that has color.
Check out https://en.wikipedia.org/wiki/Standard_Model_(mathematical_formulation)

"Interactions" are those terms of the Lagrangian where you have more than one type of field (or a derivative of one). You can read off "what interacts with what" by looking at the fields in such terms.

The terms which have only one type of field are "kinetic terms" and describe how this field's particles fly freely when they do not interact with anything.

Spinnor
Orodruin
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The terms which have only one type of field are "kinetic terms" and describe how this field's particles fly freely when they do not interact with anything.
This is not entirely correct. For example you have the terms of the Higgs potential and the self-interaction terms of the non-Abelian gauge groups.

ChrisVer
Gold Member
The terms which have only one type of field are "kinetic terms" and describe how this field's particles fly freely when they do not interact with anything.
I guess you meant only field derivatives?

ohwilleke
Gold Member
Not the best at physics but trying to understand the standard model. So can someone please tell me if this is right or not and if not, can you explain me why?

Higgs bosons reacts with everything that has mass.
No. Higgs mechanism gives rise to the mass of the quarks, of the charged leptons and possibly of the W and Z bosons.

But, it isn't clear if neutrinos get their masses from the Higgs mechanism or not (in the SM before neutrinos were discovered to have mass, they did not).

Also, most of the mass in the universe comes from the energy of gluons trapped in hadrons (such as protons and neutrons) and not from the quarks in those hadrons. The Higgs mechanism has nothing to do with the mass that arises from strong force interactions, which is most of the ordinary matter mass in the universe.

(Edited to remove "Higgs boson" as the portion of the Higgs mechanism responsible.)

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ChrisVer
Gold Member
Higgs bosons together with the Higgs field give rise to the mass of the quarks, of the charged leptons and possibly of the W and Z bosons
The HIggs bosons have nothing to do with the mass of the quarks,leptons and W/Z. They are real particles that interact with fermions via Yukawa interactions (as scalars supposed to do), with couplings proportional to the fermions' masses.

ohwilleke
Gold Member
The HIggs bosons have nothing to do with the mass of the quarks,leptons and W/Z. They are real particles that interact with fermions via Yukawa interactions (as scalars supposed to do), with couplings proportional to the fermions' masses.
So, is your point to distinguish the Higgs boson from the Higgs field?

ChrisVer
Gold Member
So, is your point to distinguish the Higgs boson from the Higgs field?
its a relic [extra dof] but not what's responsible for the mass [which is the field's vev in what you've listed]...

Orodruin, is it possible that the chart at the Wikipedia link: "Weak Hypercharge", showing that the Z boson possesses neither Weak Isospin or Weak Hyper charge, is in error, as you mention above that "Z bosons couple to a linear combination of weak hypercharge and the third component of weak isospin."? Assuming that chart is correct, then for sure I need to follow the advice you gave to "heavybuilder" on "...learning the Standard Model from the basic gauge interactions...".

Orodruin
Staff Emeritus