Measurement of the b Quark Fragmentation Function in Z0 decay

TL;DR

This paper reports a new measurement of the b quark fragmentation function in Z0 decays, using a novel energy reconstruction technique with high precision, and compares results with various theoretical models.

Contribution

It introduces a novel kinematic B hadron energy reconstruction method and provides precise measurements of the b quark fragmentation function in Z0 decays.

Findings

Average scaled B hadron energy xB = 0.714 ± 0.005 (stat) ± 0.007 (syst) ± 0.002 (model)

Several functional forms of the energy distribution are excluded by the data

High efficiency and resolution in B energy measurement across the full kinematic range

Abstract

We present preliminary results of a new measurement of the inclusive b quark fragmentation function in Z0 decays using a novel kinematic B hadron energy reconstruction technique. The measurement is performed using 150,000 hadronic Z0 events recorded in the SLD experiment at SLAC between 1996 and 1997. The small and stable SLC beam spot and the CCD-based vertex detector are used to reconstruct topological B-decay vertices with high efficiency and purity, and to provide precise measurements of the kinematic quantities used in this technique. We measure the B energy with good efficiency and resolution over the full kinematic range. We compare the measured scaled B hadron energy distribution with several functional forms of the B hadron energy distribution and predictions of several models of b quark fragmentation. Several functions are excluded by the data. The average scaled energy of the weakly decaying B hadron is measured to be xB = 0.714 +/- 0.005 (stat) +/- 0.007 (syst) +/- 0.002 (model) (preliminary).