# Determination of HQET parameter \\lambda\_1 from Inclusive Semileptonic B Meson Decay Spectrum

Source: [Determination of HQET parameter \\lambda\_1 from Inclusive Semileptonic B Meson Decay Spectrum](<https://www.sota2.com/research/paper/68fa29fb1e209131ce83947d>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T13:15:02.274Z

Authors: K.K. Jeong, C.S. Kim

Published: 1998-11-26T07:08:12.000Z

## Abstract

We estimate the heavy quark effective theory parameter \\lambda\_1 from inclusive semileptonic B-meson decay spectrum. By using recent CLEO double lepton tagging data of B -\> X e nu, which shows the lepton momentum as low as 0.6 GeV, we extracted \\lambda\_1 \\sim -0.58 GeV^2. We also derived \\bar\\Lambda \\sim 0.46 GeV and \|V\_{cb}\| = 0.041 \\pm 0.002.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ph/9811475>)

[PDF](<https://arxiv.org/pdf/hep-ph/9811475.pdf>)