Register

Adv. Query

Q&A (4871)

Reviews (203)

Open problems (47)
Meta (439)

Site Statistics

205 submissions , 163 unreviewed
5,082 questions , 2,232 unanswered
5,354 answers , 22,789 comments
1,470 users with positive rep
820 active unimported users
More ...

Are there fermionic bound states that are gauge neutral to all gauge forces?

602 views

Puzzle: In our standard model particle physics, are there fermionic bound states that are gauge neutral to all gauge forces?

Here we concern strong SU(3) color, electromagnetic U(1) EM, hyper U(1), and weak SU(2) forces.

It looks that a single neutron (with 3 quarks $uud$) is a bound state, neutral under electric force and strong force. But from the post Are Neutrons gauge neutral to all gauge forces?

the neutron has a magnetic moment so interacted with magnetic field. (This is a bit strange to me, since we can boost the Lorentz force, which can mix electric and magnetic field. So after boosting the reference frame, the electric neutral neutron can also be electric non-neutral interacting with electric field???)
the neutron also carries weak charge (how much?)

Are there possible candidates of fermionic bound states that are gauge neutral to all gauge forces?

This post imported from StackExchange Physics at 2020-11-28 23:02 (UTC), posted by SE-user annie marie heart

asked Apr 1, 2020 in Theoretical Physics by annie marie heart (1,205 points) [ no revision ]

No such particles. As for magnetic moments, linked. Have you studied neutral electric dipoles?

This post imported from StackExchange Physics at 2020-11-28 23:02 (UTC), posted by SE-user Cosmas Zachos

commented Apr 1, 2020 by Cosmas Zachos (370 points) [ no revision ]

Does the right handed neutron as a bound state count as gauge neutral to all gauge forces?? $u_Rd_Rd_R$, suppose that the Higgs condensate is zero (so right handed [SU(2) singlet] quarks cannot be paired to the left handed [SU(2) doublet] via mass term.]

This post imported from StackExchange Physics at 2020-11-28 23:02 (UTC), posted by SE-user annie marie heart

commented Apr 1, 2020 by annie marie heart (1,205 points) [ no revision ]

Your comment on this question:

To answer, leave an answer instead. Comments are usually for non-answers.
To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL.
To alert a user, please use the "@" command and remove spaces from the username, example, the user "John Doe" should be pinged as "@JohnDoe", while the user "Johndoe" should be pinged as "@Johndoe". The post author is always automatically pinged (unless you are the post author).
Please consult the FAQ for as to how to format your post.

Live preview (may slow down editor) Preview

Your name to display (optional):

Email me at this address if a comment is added after mine:

Privacy: Your email address will only be used for sending these notifications.

Anti-spam verification:

[captcha placeholder]

Please complete the anti-spam verification

Your answer

Please use answers only to (at least partly) answer questions. To comment, discuss, or ask for clarification, leave a comment instead.
To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL.
Please consult the FAQ for as to how to format your post.
This is the answer box; if you want to write a comment instead, please use the 'add comment' button.

Live preview (may slow down editor) Preview

Your name to display (optional):

Email me at this address if my answer is selected or commented on:

Privacy: Your email address will only be used for sending these notifications.

Anti-spam verification:

If you are a human please identify the position of the character covered by the symbol $\varnothing$ in the following word:
$\varnothing\hbar$ysicsOverflow
Then drag the red bullet below over the corresponding character of our banner. When you drop it there, the bullet changes to green (on slow internet connections after a few seconds).

Please complete the anti-spam verification

user contributions licensed under cc by-sa 3.0 with attribution required

Your rights

...