Unparticle Physics Effects on D0-anti-D0 Mixing

Abstract

The mixing of $K^0-\overline{K^0}$, $D^0-\overline{D^0}$ and $B_{(s)}^0-\overline{B_{(s)}^0}$ provides a sensitive probe to explore new physics beyond the Standard Model. The scale invariant unparticle physics recently proposed by Georgi can induce flavor-changing neutral current and contribute to the mixing at tree level. We investigate the unparticle effects on $B^0-\overline{B^0}$ and $D^0-\overline{D^0}$ mixing. Especially, the newly observed $D^0-\overline{D^0}$ mixing sets the most stringent constraints on the coupling of the unparticle to quarks.

Comments: 9 pages, some errors corrected, published version