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TL;DR

This paper reports recent Fermilab Tevatron results on flavor physics, including limits on rare decays, CP violation, and B_s oscillation frequency, providing the most stringent bounds to date.

Contribution

It presents the first direct experimental bounds on the B_s oscillation frequency and improved limits on rare decay and CP violation parameters.

Findings

World's best limits on $ ext{CP}$ violation parameter $\e_B$

First direct bound on $B_s$ oscillation frequency $ riangle m_s$

Stringent limit on $D^+ o \pi^+\mu^+\mu^-$ branching ratio

Abstract

We present recent DO results based on approximately 1 fb$^{-1}$ of $p \bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV recorded at the Fermilab Tevatron. Preliminary results on a search for the flavor changing neutral current process $D^+\to \pi^+\mu^+\mu^-$, a measurement of the CP violation parameter in $B$ mixing, $\epsilon_B$, and a two sided limit on the $B_s$ oscillation frequency $\Delta m_s$ are presented. The limits on $\epsilon_B$ and ${\cal B}(D^+\to \pi^+\mu^+\mu^-)$ are the world's best limits. The two sided bound on $\Delta m_s$ is the first direct indication by a single experiment that $\Delta m_s$ is bounded from above.