Unparticle Physics Effects on D0-anti-D0 Mixing

TL;DR

This paper explores how unparticle physics, a scale-invariant extension of the Standard Model, can influence meson mixing phenomena, providing new constraints on unparticle-quark interactions.

Contribution

It analyzes the effects of unparticle physics on $B^0-ar{B^0}$ and $D^0-ar{D^0}$ mixing, especially using recent $D^0$ mixing data to set bounds on unparticle couplings.

Findings

Unparticle effects can significantly contribute to meson mixing.

Recent $D^0$ mixing observations impose strict limits on unparticle-quark couplings.

The study constrains unparticle parameters based on flavor-changing neutral currents.

Abstract

The mixing of $K^0-\bar{K^0}$, $D^0-\bar{D^0}$ and $B_{(s)}^0-\bar{B^0_{(s)}}$ 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 $B^0-\bar{B^0}$ and $D^0-\bar{D^0}$ mixing. Especially, the newly observed $D^0-\bar{D^0}$ mixing sets the most stringent constraints on the coupling of the unparticle to quarks.