A Study of B0 -> J/psi K(*)0 pi+ pi- Decays with the Collider Detector at Fermilab

TL;DR

This paper reports on the measurement of branching ratios for specific B0 meson decays involving J/psi, K(*)0, and pion pairs, using data from Fermilab's Tevatron collider, identifying various contributing decay channels.

Contribution

First measurement of these B0 decay branching ratios with detailed analysis of contributing decay channels using Fermilab data.

Findings

Measured branching ratios for B0 decays involving J/psi and K(*)0 pi+ pi-

Identified contributions from psi(2S) K(*)0, J/psi K0 rho0, and other channels

Quantified decay probabilities with statistical and systematic uncertainties.

Abstract

We report a study of the decays B0 -> J/psi K(*)0 pi+ pi-, which involve the creation of a u u-bar or d d-bar quark pair in addition to a b-bar -> c-bar(c s-bar) decay. The data sample consists of 110 1/pb of p p-bar collisions at sqrt{s} = 1.8 TeV collected by the CDF detector at the Fermilab Tevatron collider during 1992-1995. We measure the branching ratios to be BR(B0 -> J/psi K*0 pi+ pi-) = (8.0 +- 2.2 +- 1.5) * 10^{-4} and BR(B0 -> J/psi K0 pi+ pi-) = (1.1 +- 0.4 +- 0.2) * 10^{-3}. Contributions to these decays are seen from psi(2S) K(*)0, J/psi K0 rho0, J/psi K*+ pi-, and J/psi K1(1270).