Determination of |Vub| from Measurements of the Electron and Neutrino Momenta in Inclusive Semileptonic B Decays

TL;DR

This paper measures the CKM matrix element |Vub| by analyzing semileptonic B decays using electron and neutrino momentum data from a large sample of Upsilon(4S) decays, providing a precise value with quantified uncertainties.

Contribution

It introduces a novel method of determining |Vub| from inclusive semileptonic B decays using electron energy and invariant mass measurements, with improved accuracy.

Findings

Measured |Vub| as (3.95 +/- 0.26 +0.58-0.42 +/- 0.25) x 10^{-3}

Quantified experimental, heavy quark, and theoretical uncertainties

Utilized a large dataset of 88 million Upsilon(4S) decays

Abstract

We present a determination of the CKM matrix element |Vub| based on the analysis of semileptonic B decays from a sample of 88 million Upsilon(4S) decays collected with the BABAR detector at the PEP-II e+e- storage ring. Charmless semileptonic B decays are selected using measurements of the electron energy and the invariant mass squared of the electron-neutrino pair. We obtain |Vub| = (3.95 +/- 0.26 ^{+0.58}_{-0.42} +/- 0.25) x 10^{-3}, where the errors represent experimental uncertainties, heavy quark parameter uncertainties, and theoretical uncertainties, respectively.