Study of high momentum eta' production in B -> eta' X_s

TL;DR

This paper measures the branching fraction of a specific B meson decay involving eta' mesons and analyzes the mass distribution of the accompanying system, providing insights into decay dynamics.

Contribution

It provides the first measurement of the branching fraction for B -> eta' X_s in a specific momentum range and compares the mass distribution to theoretical models.

Findings

Branching fraction B(B -> eta' X_s) = (3.9 ± 0.8 (stat) ± 0.5 (syst) ± 0.8 (model)) × 10^{-4}

Mass distribution favors models predicting higher X_s masses

Results improve understanding of charmless B decays involving eta' mesons

Abstract

We measure the branching fraction for the charmless semi-inclusive process B -> eta' X_s, where the eta' meson has a momentum in the range 2.0 to 2.7 GeV/c in the Upsilon(4S) center-of-mass frame and X_s represents a system comprising a kaon and zero to four pions. We find B(B -> eta' X_s)=(3.9+/-0.8(stat)+/-0.5(syst)+/-0.8(model)).10^{-4}. We also obtain the X_s mass distribution and find that it tends to favor models predicting high masses.