${{\mathit \psi}{(4660)}}$ MASS

INSPIRE   PDGID:
M189M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 4630 \pm6}$ OUR AVERAGE  Error includes scale factor of 1.4.  See the ideogram below.
$4651.0$ $\pm37.8$ $\pm2.1$ 1
ABLIKIM
2021AJ
 BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
$4619.8$ ${}^{+8.9}_{-8.0}$ $\pm2.3$ 66 2
JIA
2020
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit D}_{{s}}^{+}}{{\mathit D}_{{s2}}^{*}{(2573)}^{-}}$
$4625.9$ ${}^{+6.2}_{-6.0}$ $\pm0.4$ 89 3
JIA
2019A
 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit D}_{{s}}^{+}}{{\mathit D}_{{s1}}{(2536)}^{-}}$
$4652$ $\pm10$ $\pm11$ 279 4
WANG
2015A
 BELL 10.58 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
$4669$ $\pm21$ $\pm3$ 37 5
LEES
2014F
 BABR 10.58 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
$4634$ ${}^{+8}_{-7}$ ${}^{+5}_{-8}$ 142 6
PAKHLOVA
2008B
 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \Lambda}_{{c}}^{-}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$4647.9$ $\pm8.6$ $\pm0.8$ 7
ABLIKIM
2022R
 BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$
$4652.5$ $\pm3.4$ $\pm1.1$ 8
DAI
2017
RVUE ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \Lambda}_{{c}}^{-}}$
$4645.2$ $\pm9.5$ $\pm6.0$ 9
ZHANG
2017B
 RVUE ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
$4646.4$ $\pm9.7$ $\pm4.8$ 10
ZHANG
2017C
 RVUE ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$ or ${{\mathit \psi}{(2S)}}$
$4661$ ${}^{+9}_{-8}$ $\pm6$ 44 11
LIU
2008H
 RVUE 10.58 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
$4664$ $\pm11$ $\pm5$ 44
WANG
2007D
 BELL 10.58 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
1  From a three-resonance fit to the Born cross section in the range $\sqrt {s }$ = $4.008 - 4.698$ GeV.
2  Using ${{\mathit D}_{{s2}}^{*}{(2573)}^{-}}$ $\rightarrow$ ${{\overline{\mathit D}}^{0}}{{\mathit K}^{-}}$ decays.
3  From a fit of a Breit-Wigner convolved with a Gaussian.
4  From a two-resonance fit. Supersedes WANG 2007D.
5  From a two-resonance fit.
6  The ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$ and ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \Lambda}_{{c}}^{-}}$ states are not necessarily the same.
7  From a fit to the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(3823)}}$ cross section between 4.23 and 4.70 GeV with two coherent Breit-Wigner resonances. The data is also consistent with a single peak with mass $4417.5$ $\pm26.2$ $\pm3.5$ MeV and width $245$ $\pm48$ $\pm13$ MeV.
8  The pole parameters are extracted from the speed plot.
9  From a three-resonance fit.
10  From a combined fit of BELLE, BABAR and BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$ data.
11  From a combined fit of AUBERT 2007S and WANG 2007D data with two resonances.

           ${{\mathit \psi}{(4660)}}$ MASS (MeV)
References:
ABLIKIM 2022R
PRL 129 102003 Observation of resonance structures in $e^+e^-\to \pi^+\pi^-\psi_2(3823)$ and mass measurement of $\psi_2(3823)$
ABLIKIM 2021AJ
PR D104 052012 Cross section measurement of $e^+e^-\rightarrow\pi^+\pi^-(3686)$ from $\sqrt{S}=4.0076$ to 4.6984 GeV
JIA 2020
PR D101 091101 Evidence for a vector charmoniumlike state in $e^+e^- \to D^+_sD^*_{s2}(2573)^-+c.c.$
JIA 2019A
PR D100 111103 Observation of a vector charmoniumlike state in $e^+e^- \to D^+_sD_{s1}(2536)^-+c.c.$
DAI 2017
PR D96 116001 Re-examining the ${{\mathit X}{(4630)}}$ Resonance in the Reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\overline{\mathit \Lambda}}_{{c}}^{-}}$
ZHANG 2017C
EPJ C77 727 Combined Fit to the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit J / \psi}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(3686)}}$ Line Shape
ZHANG 2017B
PR D96 054008 Revisiting the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(3686)}}$ Line Shape
WANG 2015A
PR D91 112007 Measurement of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$ via Initial State Radiation at Belle
LEES 2014F
PR D89 111103 Study of the Reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ via Initial-State Radiation at BaBar
LIU 2008H
PR D78 014032 Combined Fit to BABAR and Belle Data on ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
PAKHLOVA 2008B
PRL 101 172001 Observation of a Near-Threshold Enhancement in the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \Lambda}_{{c}}^{-}}$ Cross Section using Initial-State Radiation
WANG 2007D
PRL 99 142002 Observation of Two Resonant Structures in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$ via Initial-State Radiation at Belle