Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --> D*- l+ nu_l Decays

2002/07/24 by B. Aubert, The BABAR Collaboration, Aubert, B. +1
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.hep-ex/0207071

openalex publication_date 2002/07/24 · openalex created_date 2022/10/01 · openalex updated_date 2026/08/01

Abstract

We measure the B0 lifetime tau_B0 and the B-Bbar oscillation frequency Deltam_d with a sample of approximately 14,000 exclusively reconstructed B0 -> D*- l+ nu_l signal events, selected from 23 million B-Bbar pairs recorded at the Upsilon(4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The b-quark flavor of the other B at the time of decay and its decay position are determined inclusively. The lifetime and oscillation frequency are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in B decay times (Delta-t), the calculated uncertainty on Delta-t, the signal and background probabilities, and b-quark tagging information for the other B. The preliminary results are tau_B0 = (1.523 +0.024 -0.023 (stat) +/- 0.022 (syst)) ps and Deltam_d = (0.492 +/- 0.018 (stat) +/- 0.013 (syst)) ps^-1. The statistical correlation coefficient between tau_B0 and Deltam_d is -0.22.

Related

• Measurement of the B0bar Lifetime and of the B0-B0bar Oscillation Frequency Using Partially Reconstructed B0bar -> D*+ l- anti-nu(l) Decays
• Measurement of B0 and B+ lifetimes and B0-antiB0 mixing with fully reconstructed B decays in BaBar
• Preliminary BABAR results on B0 mixing with dileptons and on lifetime with partially reconstructed B0 decays
• A measurement of CP-violation parameters in B0B0bar mixing using partially reconstructed D*- l+ nu_l events at BaBar
• Measurement of the B⁰ meson properties using partially reconstructed B⁰ to D^*-pi⁺ and B⁰ to D^*-l⁺nu decays with the BABAR detector