Neural network parametrization of the lepton energy spectrum in semileptonic B meson decays

Details Neural network parametrization of the lepton energy spectrum in semileptonic B meson decays Neural network parametrization of the lepton energy spectrum in semileptonic B meson decays

2006-01-27

arxiv.org/abs/hep-ph/0601229v4

JHEP 0605:040,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

32 pages, 22 figures, JHEP3 class. v4 version accepted for publication in JHEP

Scientific paper

10.1088/1126-6708/2006/05/040

We construct a parametrization of the lepton energy spectrum in inclusive semileptonic decays of B mesons, based on the available experimental information: moments of the spectrum with cuts, their errors and their correlations, together with kinematical constraints. The result is obtained in the form of a Monte Carlo sample of neural networks trained on replicas of the experimental data, which represents the probability density in the space of lepton energy spectra. This parametrization is then used to extract the b quark mass m_b^{1S} in a way that theoretical uncertainties are minimized, for which the value m_b^{1S}=4.84 \pm 0.14^{exp}\pm 0.05^{th} GeV is obtained.

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