Timeline for Why is a pion so light compared to a neutron or proton?
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| Apr 13, 2017 at 12:39 | history | edited | CommunityBot |
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| May 6, 2013 at 15:59 | comment | added | Siva | Well, if one works out the nonlinear sigma model, then the pion mass comes out propotional to the sum of current masses of the two quarks (and the condensate vev, divided by ${f_{\pi}}^2$ where $f_\pi$ is the pion decay constant). But like I said, I don't understand it well enough to explain the big picture without getting bogged down by the details. | |
| May 4, 2013 at 6:37 | comment | added | dmckee --- ex-moderator kitten | Assigning the quarks a constituent mass a bit over $2m_\pi$ doesn't really help here (for all that it does a passable job of explaining the baryon spectrum): it simply leaves the question of why the pion is too light by a factor of four. | |
| May 4, 2013 at 6:07 | history | answered | Siva | CC BY-SA 3.0 |