Moments of the Hadronic Invariant Mass Spectrum in B --> X_c l nu Decays at Belle

TL;DR

This paper reports a measurement of the hadronic invariant mass spectrum in B meson decays, providing detailed moments analysis crucial for understanding semileptonic decay dynamics and aiding in precise determination of fundamental parameters.

Contribution

First measurement of the moments of the hadronic invariant mass spectrum in B --> X_c l nu decays using Belle data, including correlations across various lepton energy thresholds.

Findings

Measured first, second central, and second non-central moments of the spectrum.

Analyzed moments across multiple lepton energy thresholds.

Provided correlation matrices for the measured moments.

Abstract

We present a measurement of the hadronic invariant mass squared (M^2_X) spectrum in charmed semileptonic B meson decays B --> X_c l nu based on 140 fb^-1 of Belle data collected near the Y(4S) resonance. We determine the first, the second central and the second non-central moments of this spectrum for lepton energy thresholds ranging between 0.7 and 1.9 GeV. Full correlations between these measurements are evaluated.