#### ${{\mathit J / \psi}{(1S)}}$ WIDTH

VALUE (keV) EVTS DOCUMENT ID TECN  COMMENT
 $\bf{ 92.6 \pm1.7}$ OUR AVERAGE  Error includes scale factor of 1.1.
$92.45$ $\pm1.40$ $\pm1.48$ 1
 2020
KEDR ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$96.1$ $\pm3.2$ 13k 2
 2006 A
CLEO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$
$84.4$ $\pm8.9$
 1995 B
BES ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$91$ $\pm11$ $\pm6$ 3
 1993 B
E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$85.5$ ${}^{+6.1}_{-5.8}$ 4
 1992
RVUE See ${{\mathit \Upsilon}}$ mini-review
• • We do not use the following data for averages, fits, limits, etc. • •
$92.94$ $\pm1.83$ 5, 6
 2018 A
KEDR ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$94.1$ $\pm2.7$ 7
 2010
KEDR 3.097 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$
$93.7$ $\pm3.5$ 7.8k 2
 2004
BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$
 1 Based on the same dataset as ANASHIN 2018A and correlated to the values reported there .
 2 Calculated by us from the reported values of $\Gamma\mathrm {( {{\mathit e}^{+}} {{\mathit e}^{-}} )}{\times }$B( ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) using B( ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) = ($5.94$ $\pm0.06)\%$ and B( ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) = ($5.93$ $\pm0.06)\%$.
 3 The initial-state radiation correction reevaluated by ANDREOTTI 2007 in its Ref. [4].
 4 Using data from COFFMAN 1992 , BALDINI-CELIO 1975 , BOYARSKI 1975 , ESPOSITO 1975B, BRANDELIK 1979C.
 5 Using $\Gamma$( ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) from ANASHIN 2018A and B( ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) = ($5.971$ $\pm0.032)\%$ from PDG 2016 .
 6 Superseded by ANASHIN 2020 that is based on the same dataset .
 7 Assuming $\Gamma$( ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) = $\Gamma$( ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) and using $\Gamma$( ${{\mathit e}^{+}}{{\mathit e}^{-}}$ )/$\Gamma _{{\mathrm {total}}}$ = ($5.94$ $\pm0.06)\%$.
References:
 ANASHIN 2020
JHEP 2007 112 Measurement of $\Gamma_{ee}(J/\psi)$ with KEDR detector
 ANASHIN 2018A
JHEP 1805 119 Measurement of $\Gamma_{ee}(J/\psi)$ with KEDR detector
 ANASHIN 2010
PL B685 134 Measurement of $\mathit \Gamma _{{{\mathit e}}{{\mathit e}}}({{\mathit J / \psi}})\cdot{}$B( ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) and $\mathit \Gamma _{{{\mathit e}}{{\mathit e}}}({{\mathit J / \psi}})\cdot{}$B( ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ )
PR D73 051103 Measurement of $\Gamma _{ee}({{\mathit J / \psi}}$), $\Gamma _{tot}({{\mathit J / \psi}}$), and $\Gamma _{ee}[{{\mathit \psi}{(2S)}}]/\Gamma _{ee}({{\mathit J / \psi}}$)
PR D69 011103 ${{\mathit J / \psi}}$ Production via Initial State Radiation in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$ at an ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Center of Mass Energy near 10.6 GeV
PL B355 374 A Measurement of ${{\mathit J / \psi}}$ Decay Width
PR D47 772 Measurement of the ${{\mathit J / \psi}}$ and ${{\mathit \psi}^{\,'}}$ Resonance Parameters in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation
PR D45 2181 Width of the ${{\mathit J / \psi}}$ Resonance