An Improved Measurement of the b Quark Fragmentation Function in Z0 Decays

TL;DR

This paper reports a new measurement of the b quark fragmentation function in Z0 decays using a novel energy reconstruction technique, providing precise data that challenges some existing models and improves understanding of b quark hadronization.

Contribution

It introduces a new method for measuring B hadron energy in Z0 decays and provides a more accurate fragmentation function measurement with high efficiency and resolution.

Findings

Average scaled B hadron energy XB = 0.719 ± 0.005 (stat) ± 0.007 (syst) ± 0.001 (model)

Several fragmentation functions, including JETSET + Peterson, are inconsistent with the data

The measurement improves constraints on b quark fragmentation models.

Abstract

We present a new preliminary measurement of the 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 scaled B hadron energy distribution with several functional forms of the B hadron energy distribution and models of b quark fragmentation. Several functions including JETSET + Peterson are excluded by the data. The average scaled energy of the weakly decaying B hadron is measured to be XB = 0.719 +/- 0.005 (stat) +/- 0.007 (syst) +/- 0.001 (model) (preliminary).