${{\mathit \psi}{(2S)}}$ WIDTH

INSPIRE   JSON  (beta) PDGID:
M071W
VALUE (keV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 293 \pm9}$ OUR FIT  Error includes scale factor of 1.2.
$\bf{ 286 \pm16}$ OUR AVERAGE
$358$ $\pm88$ $\pm4$
ABLIKIM
2008B
 BES2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ hadrons
$290$ $\pm25$ $\pm4$ 2.7k
ANDREOTTI
2007
E835 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit J / \psi}}{{\mathit X}}$
$331$ $\pm58$ $\pm2$
ABLIKIM
2006L
 BES2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ hadrons
$264$ $\pm27$ 1
BAI
2002B
 BES2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$287$ $\pm37$ $\pm16$ 2
ARMSTRONG
1993B
 E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$
1  From a simultaneous fit to the hadronic and ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ cross section, assuming $\Gamma $ = $\Gamma _{{{\mathit h}}}$ $+$ $\Gamma _{{{\mathit e}}}$ $+$ $\Gamma _{{{\mathit \mu}}}$ $+$ $\Gamma _{{{\mathit \tau}}}$ and lepton universality. Does not include vacuum polarization correction.
2  The initial-state radiation correction reevaluated by ANDREOTTI 2007 in its Ref. $\lbrack{}$4].
References
see fit info