Measurement of B_c properties at CDF

TL;DR

This paper reports measurements of the Bc meson's lifetime and production ratios using semileptonic decay data collected by the CDF II detector, providing new insights into its properties.

Contribution

The study presents the first measurements of Bc lifetime and production ratios relative to B+ mesons at the Tevatron, using 1 fb-1 of data.

Findings

Bc lifetime measured as 142.5+15.8-14.8 mum.

Production ratio of Bc to B+ for pT > 4 GeV/c is 0.295+/-0.040.

Production ratio for pT > 6 GeV/c is 0.227+/-0.033.

Abstract

The Bc meson is composed of two heavy quarks of distinct flavor. Measurements of its lifetime and production properties have been made based on semileptonic Bc to J/psi+l+X decays using data collected with the CDF II detector corresponding to an integrated luminosity of 1 fb-1. The Bc average lifetime ctau is measured to be 142.5+15.8-14.8(stat) 5.5(syst) mum. The measurements of the ratio of the production cross section times branching ratio of Bc to J/psi+mu+nu relative to B+ to J/psi+K were done for two pT(B) thresholds: for pT(B) greater 4 GeV/c as 0.295+/-0.040(stat)+0.033-0.026(syst.)0.036(pT spectrum) and for pT(B) greater 6 GeV/c as 0.227+/-0.033(stat)+0.024-0.017(syst.)+/-0.014(pT spectrum).