User talk:Xerxes314

Hello! Welcome to Wikipedia. Thank you for your fine work on 'Fermion'. Judging from just this one article, it seems that your forte is chemistry or quantum mechanics; you can find plenty of articles in need of help in various fields of science and in other fields at Wikipedia:Pages needing attention.

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-- Djinn112 20:08, Feb 11, 2004 (UTC)

Hi Xerxes -- I see you made a major contribution to the fermion article -- you might be interested in my comment on whether spin or statistics is their defining property, at Talk:fermion. BTW, regarding your edit summary at black hole: Article does not change. Mind changes. ;-) Fpahl 06:23, 8 Oct 2004 (UTC)

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-Hey would you mind devoting some time to my project? oo64eva (AJ) 18:41, Apr 5, 2005 (UTC)

Voting for standardization

Hi. I'm oo64eva. We're holding a vote here to standardize the table and color template. If you have any questions leave a message on my talk page or on the project talk page. Spread the word about the vote, it ends May 12th at 3:40 UTC. — oo64eva (Alex) ^{(U | T | C)} @ 04:06, May 9, 2005 (UTC)

flavour and qcd

Xerxes: Nice detective work (talk:flavour (particle physics). I knew the name SM was new 20+ years back, but had never bothered to track it down. I also liked your additions to the QCD page. Bambaiah 10:00, May 25, 2005 (UTC)

kkbar mixing

Thanks. I've replaced the figure with a corrected version at the approximate hadronic effective theory level that I wanted to show here. You are right of course about the box diagram requiring W and not π, but I didn't want to show pictures at the SM level here. Bambaiah 09:19, Jun 20, 2005 (UTC)

Since the decays K⁰→2π (and similarly for K0bar) are almost 100% of the total decay width, the modified figure is the dominant contribution to the oscillation. I guess your question is which operators in the chiral PT correspond to this process. Let me go through the logic before I get back to you in a couple of days. Bambaiah 06:19, Jun 21, 2005 (UTC)

Yes, showing the box diagram (above) is simplest. I've now done that, but that leaves me unhappy because the Pais Gell-Mann analysis (2×2 matrix as in the article) did not need quarks. If you take the box diagram and imagine an u quark loop between the W's, then you get pion (and D meson) pair exchange. This is the picture that I wanted to use, except of course for the nice little problem you mentioned. I guess they just wrote down a Hamiltonian and constrained it by symmetry, without bothering about the exchanges that would give the form they got. But I can't quite believe that; I need to look at the papers again. Bambaiah 08:56, Jun 22, 2005 (UTC)