Search for Structure in $σ (e^{+} e^{-} \to hadrons)$ between $\sqrt{s} = 10.34 and 11.6$ GeV

Publisher Website

5 April 1982

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 48 (14) , 906-910
https://doi.org/10.1103/physrevlett.48.906

Abstract

The CUSB detector at the Cornell Electron Storage Ring has been used to measure

R = \frac{σ (e^{+} e^{-} \to hadrons)}{σ (e^{+} e^{-} \to μ^{+} μ^{-})}

in the c.m. energy regions between the

ϒ^{''}

and the

ϒ^{'''}

, and above the

ϒ^{'''}

up to

\sqrt{s} = 11.6

GeV, with integrated luminosities of 5000 and 2100

{nb}^{- 1}

, respectively. No narrow resonances are observed, and limits on the leptonic widths are presented. The average value of

R

increases by 0.31±0.06 across the flavor threshold.

Keywords

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