2007/07/18 by The BABAR Collaboration, B. Aubert, Aubert, B.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.0707.2670
openalex publication_date 2007/07/18 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
We present a measurement of moments of the inclusive hadronic-mass and -energy spectrum in semileptonic B → Xc ℓ- ν decays. This study is based on a sample of 232 million Υ(4S) → BB decays recorded by the BABAR detector at the PEP-II e+e--storage rings. We reconstruct the semileptonic decay by identifying a lepton in events tagged by a fully reconstructed hadronic decay of the second B meson. We report preliminary results for the moments with k=1,...,6 and with k=2,4,6 and nX2 = mX2 c4 - 2 Λ EX + Λ2, with mX the mass of the hadronic system, EX its energy, and Λ a constant of 0.65 GeV, for different minimal lepton momenta between 0.8 and 1.9 GeV/c measured in the B-meson rest frame. These are predicted in the framework of a Heavy Quark Expansion (HQE), which allows the extraction of the total semileptonic branching fraction, the CKM-matrix element |Vcb|, and the quark masses mb and mc, together with the dominant non-perturbative HQE parameters. We find as preliminary results |Vcb| = (41.88 ± 0.81) ⋅ 10-3 and mb = (4.552 ± 0.055) GeV/c2.