Measurement of the B0 B0-bar oscillation frequency using pi-B meson charge-flavor correlations in p p-bar collisions at sqrt{s} = 1.8 TeV

TL;DR

This paper measures the B0 B0-bar oscillation frequency using charge-flavor correlations in proton-antiproton collisions, providing insights into B meson mixing and flavor tagging techniques at high energies.

Contribution

It introduces a flavor tagging method based on charge correlations from hadronization and B** decays, and measures the oscillation frequency and tagging efficiency at sqrt{s} = 1.8 TeV.

Findings

Measured oscillation frequency: Delta m_d = 0.471 +0.078 -0.068 (stat) ± 0.034 (syst) hbar ps^-1

Evaluated the efficiency and purity of flavor tagging for B mesons

Provided experimental data on B meson mixing at Tevatron energies

Abstract

We present a measurement of the B0 B0-bar oscillation frequency using a flavor tagging method based on correlations of B meson flavor with the charge of other particles produced in p p-bar collisions at sqrt{s} = 1.8 TeV. Such correlations are expected to arise from b quark hadronization and from B** decays. We partially reconstruct B mesons using the semileptonic decays B0 -> lepton D(*)- X. and B+ -> lepton D0-bar X$. From the oscillation frequency, we obtain the mass difference between the two B0 mass eigenstates, Delta m_d = 0.471 {+0.078} {-0.068}(stat) +- 0.034 (syst) hbar ps-1, and measure the efficiency and purity of this flavor tagging method for both charged and neutral B mesons.