Evidence for B_s production at the Upsilon(5S) from CLEO and properties of the Upsilon(4S) from BaBar

TL;DR

This paper presents evidence for B_s meson production at the Upsilon(5S) resonance from CLEO data and measures properties of the Upsilon(4S) resonance from BaBar, including its mass, width, and decay branching ratios.

Contribution

It provides the first evidence of B_s production at the Upsilon(5S) and reports measurements of Upsilon(4S) properties and decay branching ratios.

Findings

Evidence for B_s production at Upsilon(5S) with branching ratio ~21%.

Measured Upsilon(4S) mass and full width.

Determined Upsilon(4S) decay branching ratio to B0 B0b.

Abstract

BaBar experiment scan around the Upsilon(4S) resonance and measure its mass and full width. They also measure Br(Upsilon(4S) -> B0 B0b) = 0.486 +/- 0.010 +/- 0.009 from 81.7 fb-1 Upsilon(4S) data. CLEO collaboration took about 0.42 fb-1 Upsilon(5S) data. They search for B_s in both inclusive and exclusive modes and find evidence for B_s production at the \Upsilon(5S) and Br(Upsilon(5S) -> B_s^(*) B_s^(*)b) = (21 +/- 3 +/- 9)%.