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Found: Elusive particle!
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<blockquote data-quote="freyar" data-source="post: 5885403" data-attributes="member: 40227"><p>Right so far...</p><p></p><p></p><p>It's not an over-emphasis, it's a completely incorrect definition. And that's my issue with this whole discussion.</p><p></p><p>The point is that the "non-annihilation" of photons in lasers (as you say, "the ultimate state of proximity") is not due to boson-ness. but due to the fact that they are massless. If electrons and positrons (fermions) were massless, then lined up photons would annihilate into electrons and positrons at <strong>precisely</strong> the same rate that lined up electrons and positrons annihilate into photons.</p><p></p><p>There is one case where boson vs fermion makes a difference in annihilations. That's when a particle is its own anti-particle (like a Majorana fermion). But the effect is the opposite of what the article states! That is, if a boson is its own antiparticle, then it and its antiparticle can "share the same space" easily and therefore annihilate easily. Two of the same kind of Majorana fermion are restricted by the Pauli exclusion principle --- they can't occupy the same space --- so it is harder for them to annihilate. </p><p></p><p>The problem isn't overemphasis. It's that the article is mixing up two separate things --- statistics vs antiparticles. And in the one case where there is a relationship, it states the opposite of what really happens! While it's neat that this story made it through several major news outlets, this article is just a poor, poor explanation of the relevant physics.</p></blockquote><p></p>
[QUOTE="freyar, post: 5885403, member: 40227"] Right so far... It's not an over-emphasis, it's a completely incorrect definition. And that's my issue with this whole discussion. The point is that the "non-annihilation" of photons in lasers (as you say, "the ultimate state of proximity") is not due to boson-ness. but due to the fact that they are massless. If electrons and positrons (fermions) were massless, then lined up photons would annihilate into electrons and positrons at [b]precisely[/b] the same rate that lined up electrons and positrons annihilate into photons. There is one case where boson vs fermion makes a difference in annihilations. That's when a particle is its own anti-particle (like a Majorana fermion). But the effect is the opposite of what the article states! That is, if a boson is its own antiparticle, then it and its antiparticle can "share the same space" easily and therefore annihilate easily. Two of the same kind of Majorana fermion are restricted by the Pauli exclusion principle --- they can't occupy the same space --- so it is harder for them to annihilate. The problem isn't overemphasis. It's that the article is mixing up two separate things --- statistics vs antiparticles. And in the one case where there is a relationship, it states the opposite of what really happens! While it's neat that this story made it through several major news outlets, this article is just a poor, poor explanation of the relevant physics. [/QUOTE]
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