Evidence for B^(*)_s Production at the Upsilon(5S)

TL;DR

This paper provides the first evidence of significant B_s meson production at the Upsilon(5S) resonance, using decay properties to distinguish B_s from lighter B mesons, and estimates the production ratio at about 21%.

Contribution

It presents the first experimental evidence of B_s meson production at the Upsilon(5S) resonance and estimates its production ratio, advancing understanding of bottomonium decay properties.

Findings

Evidence of substantial B_s production at Upsilon(5S)

Estimated B_s production ratio is approximately 21%

Supports decay property differences between B_s and lighter B mesons

Abstract

Based on data collected by the CLEO III detector at CESR, we started a series of investigations to open the mysteries of the $\Upsilon$(5S) resonance decay properties. $B_s$ mesons are expected to decay predominantly into $D_s$ meson, while the lighter $B$ mesons decay into $D_s$ only about 10% of the time. We exploit this difference to present the first evidence of a substantial production of $B_s$ mesons at the $\Upsilon$(5S) resonance. We make here a preliminary model dependent estimate of the ratio of $B_s^{(*)}\bar{B}_s^{(*)}$ to the total $b\bar{b}$ quark pair production at the $\Upsilon$(5S) energy to be $(21\pm 3 \pm 9)$%.