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Natural Science Forum / Physics / Particle Physics / March 2008Question about quark and antiquark
Every meson is composed of a quark and an antiquark. And a pion is composed of an up quark and an up antiquark. But antimatter will annihilate matter. How could these two particles stay closely yet peacefully? P.S It's my first time to use this web. Can any one tell me how to type expressions here like up antiquark? Thank you very much! > Every meson is composed of a quark and an antiquark. And a pion is > composed of an up quark and an up antiquark. But antimatter will [quoted text clipped - 3 lines] > P.S It's my first time to use this web. Can any one tell me how to > type expressions here like up antiquark? Thank you very much! A good explanation is at... http://en.wikipedia.org/wiki/Pion. Essentially the neutral pion is a superposition of an up - antidown - down - antiup quarks. Relative to the charged pions, they don't last long. There is no pion which is purely a mixture like up-antiup or down-antidown. > Every meson is composed of a quark and an antiquark. And a pion is > composed of an up quark and an up antiquark. But antimatter will > annihilate matter. How could these two particles stay closely yet > peacefully? How does a spring work? Sometimes even fires will burn backwards-- this is called recombination. > P.S It's my first time to use this web. Can any one tell me how to > type expressions here like up antiquark? Thank you very much! There is none in HTML. I use 'u'. -Aut > Every meson is composed of a quark and an antiquark. And a pion is > composed of an up quark and an up antiquark. But antimatter will > annihilate matter. How could these two particles stay closely yet > peacefully? How does a spring work? Sometimes even fires will burn backwards-- this is called dissociation. > P.S It's my first time to use this web. Can any one tell me how to > type expressions here like up antiquark? Thank you very much! There is none in HTML. I use 'u'. -Aut |
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