Author: Danning Dong Representing the SLD Collaboration, Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309
Title: Measurement of the b Quark Fragmentation Function in Z0 Decays
Abstract: We present preliminary results of a new 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 predictions of several 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).
Comments: 7 pages, ReVTeX Report-no: SLAC-PUB-8075Subj-class: (only for physics and cond-mat archives) Experimental HEP