# ${\boldsymbol m}_{{{\boldsymbol \psi}{(3770)}}}–{\boldsymbol m}_{{{\boldsymbol \psi}{(2S)}}}$ INSPIRE search

OUR FIT includes measurements of ${\mathit m}_{{{\mathit \psi}{(2S)}}}$, ${\mathit m}_{{{\mathit \psi}{(3770)}}}$, and ${\mathit m}_{{{\mathit \psi}{(3770)}}}–{\mathit m}_{{{\mathit \psi}{(2S)}}}$.
VALUE (MeV) DOCUMENT ID TECN  COMMENT
$\bf{ 87.04 \pm0.35}$ OUR FIT  Error includes scale factor of 1.1.
$\bf{ 86.6 \pm0.7}$ OUR AVERAGE  Error includes scale factor of 2.0.
$86.9$ $\pm0.4$ 1
 2007 E
BES2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ hadrons
$86.7$ $\pm0.7$
 2006 L
BES2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ hadrons
$80$ $\pm2$
 1980
MRK2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$86$ $\pm2$ 2
 1978
DLCO ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$88$ $\pm3$
 1977
LGW ${{\mathit e}^{+}}{{\mathit e}^{-}}$
1  BES-II ${{\mathit \psi}{(2S)}}$ mass subtracted (see ABLIKIM 2006L).
2  SPEAR ${{\mathit \psi}{(2S)}}$ mass subtracted (see SCHINDLER 1980 ).

${\mathit m}_{{{\mathit \psi}{(3770)}}}–{\mathit m}_{{{\mathit \psi}{(2S)}}}$ (MeV)
References:
 ABLIKIM 2007E
PL B652 238 Precision Measurements of the Mass, the Widths of ${{\mathit \psi}{(3770)}}$ Resonance and the Cross Section $\sigma\mathrm {( {{\mathit e}^{+}} {{\mathit e}^{-}} \rightarrow {{\mathit \psi}{(3770)}} )}$ at $\mathit E_{{\mathrm {cm}}}$ = 3.7724 GeV
 ABLIKIM 2006L
PRL 97 121801 Measurements of the Branching Fractions for ${{\mathit \psi}{(3770)}}$ $\rightarrow$ ${{\mathit D}^{0}}{{\overline{\mathit D}}^{0}}$ , ${{\mathit D}^{+}}{{\mathit D}^{-}}$, ${{\mathit D}}{{\overline{\mathit D}}}$, and the Resonance Parameters of ${{\mathit \psi}{(3770)}}$ and ${{\mathit \psi}{(2S)}}$
 SCHINDLER 1980
PR D21 2716 Measurement of the Parameters of the ${{\mathit \psi}{(2S)}}$ Resonance
 BACINO 1978
PRL 40 671 Observation of a Peak in Hadron and Weak Electron Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation at $\mathit E_{{\mathrm {cm}}}$ 3770 MeV
 RAPIDIS 1977
PRL 39 526 Observation of a Resonance in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation just above Charm Threshold