Publication Date

2005

Journal or Book Title

PHYSICS LETTERS B

Abstract

We study the Standard Model short-distance prediction for the mass and lifetime differences between the two neutral D meson mass eigenstates. We find that, despite αs/4π suppression, next-to-leading order (NLO) short-distance QCD corrections exceed the corresponding leading order (LO) amplitudes. For the lifetime difference, this stems from the lifting of helicity suppression of a light-quark intermediate state. We find yD is given by yNLO to a reasonable approximation but xD is greatly affected by destructive interference between xLO and xNLO. The net effect is to render yDxD6×10−7. Our NLO short-distance results, still smaller than most long-distance estimates, depend on the same two nonperturbative matrix elements of four-quark operators as in leading order.

Comments

This is the pre-published version achieved from ArXiv. The published version is located at http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TVN-4GX1P39-4&_user=1516330&_coverDate=10%2F06%2F2005&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_acct=C000053443&_version=1&_urlVersion=0&_userid=1516330&md5=d3989ab3f9ee18a5c73eb9c4f8a284b6&searchtype=a

Pages

53-62

Volume

625

Issue

1-2

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