Determination of the ϒ(1S) leptonic width

Authors :: Baru, S. E.
Blinov, A. E.
Blinov, V. E.
Bondar, A. E.
Bukin, A. D.
Groshev, V. R.
Klimenko, S. G.
Kolachev, G. M.
Onuchin, A. P.
Panin, V. S.
Protopopov, I. Ya.
Shamov, A. G.
Sidorov, V. A.
Skovpen, Yu. I.
Skrinsky, A. N.
Tayursky, V. A.
Telnov, V. I.
Tikhonov, Yu. A.
Tumaikin, G. M.
Undrus, A. E.
Vorobiov, A. I.
Zhilich, V. N.
Source :: Zeitschrift für Physik C Particles and Fields; December 1992, Vol. 56 Issue: 4 p547-552, 6p
Publication Year :: 1992
Abstract: Analyzing the data recorded with the MD-1 detector operated at the VEPP-4 storage ring we have determined the ϒ(1S) resonance leptonic partial width and mass. We find $$\begin{gathered} \Gamma _{ee} = 1.29 \pm 0.03 \pm 0.03keV, \hfill \\ M = 9460.59 \pm 0.09 \pm 0.05MeV/c^2 \hfill \\ \end{gathered} $$ M=9460.59±0.09±0.05 MeV/c<superscript>2</superscript>. This new value of the ϒ(1S) mass should supersede the previously published value [11] based on almost the same statistics.