Measurement of the effective b quark fragmentation function at the Z resonance

• Main Authors: BUSKULIC, D.; et al., THULASIDAS, M.
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 1995
• Subjects: Databases and Information Systems
• Online Access: https://ink.library.smu.edu.sg/sis_research/5767; https://ink.library.smu.edu.sg/context/sis_research/article/6770/viewcontent/Measurement_of_the_effective_b_quark_fragmentation_function_at_the_Z_resonance.pdf
• Institution: Singapore Management University

Using a sample of about 1.46 million hadronic Z decays collected between 1991 and 1993 with the ALEPH detector at LEP, the energy distribution of the B0 and B± mesons produced at the Z resonance is measured by reconstructing semileptonic decays B → ℓνℓD(X) or B→ ℓνℓD∗+(X). The charmed mesons are reconstructed through the decay modes D0 → K−π+, D0 → K−π+π−π+, D+ → K−π+π+ and D∗+→ D0π+. The neutrino energy is estimated from the missing energy in the lepton hemisphere. Accounting for B∗ and B∗∗ production, the shape of the scaled energy distribution xE(b) for mesons containing a b quark is compared to the predictions of different fragmentation models. The mean value of xE(b) is found to be 〈xE(b)〉 = 0.715 ± 0.007(stat) ± 0.013(syst).