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

INSPIRE   PDGID:
M070W
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
ANASHIN
2020
KEDR ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$96.1$ $\pm3.2$ 13k 2
ADAMS
2006A
 CLEO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$
$84.4$ $\pm8.9$
BAI
1995B
 BES ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$91$ $\pm11$ $\pm6$ 3
ARMSTRONG
1993B
 E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$85.5$ ${}^{+6.1}_{-5.8}$ 4
HSUEH
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
ANASHIN
2018A
 KEDR ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$94.1$ $\pm2.7$ 7
ANASHIN
2010
KEDR 3.097 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$, ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$
$93.7$ $\pm3.5$ 7.8k 2
AUBERT
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6  Superseded by ANASHIN 2020 that is based on the same dataset .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