${{\mathit \eta}_{{{c}}}{(2S)}}$ MASS

INSPIRE   PDGID:
M059M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 3637.7 \pm0.9}$ OUR AVERAGE  Error includes scale factor of 1.2.
$3637.90$ $\pm0.54$ $\pm1.40$ 3.7k
AAIJ
2023AH
LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}$( ${{\mathit K}_S^0}$ ${{\mathit K}}{{\mathit \pi}}$)
$3643.4$ $\pm2.3$ $\pm4.4$ 569
ABLIKIM
2022Q
BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$3( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$3635.1$ $\pm3.7$ $\pm2.9$ 106
XU
2018
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \eta}^{\,'}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$3633.6$ $\pm1.7$ $\pm0.6$ 106 1
AAIJ
2017AD
LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit B}^{+}}{{\mathit X}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit K}^{+}}{{\mathit X}}$
$3636.4$ $\pm4.1$ $\pm0.7$ 365 2
AAIJ
2017BB
LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit X}}$ $\rightarrow$ 2( ${{\mathit K}^{+}}{{\mathit K}^{-}}$) ${{\mathit X}}$
$3637.0$ $\pm5.7$ $\pm3.4$ 178 3, 4
LEES
2014E
BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$
$3635.1$ $\pm5.8$ $\pm2.1$ 47 3, 5
LEES
2014E
BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}}$
$3646.9$ $\pm1.6$ $\pm3.6$ 57
ABLIKIM
2013K
BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$3637.6$ $\pm2.9$ $\pm1.6$ 127 6
ABLIKIM
2012G
BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{0}}{{\mathit K}}{{\mathit \pi}}$ , ${{\mathit K}}{{\mathit K}}{{\mathit \pi}^{0}}$
$3638.5$ $\pm1.5$ $\pm0.8$ 624 3
DEL-AMO-SANCH..
2011M
BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$3640.5$ $\pm3.2$ $\pm2.5$ 1201 3
DEL-AMO-SANCH..
2011M
BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$3636.1$ ${}^{+3.9}_{-4.2}$ ${}^{+0.7}_{-2.0}$ 128 7
VINOKUROVA
2011
BELL ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit K}^{\pm}}({{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$)
$3626$ $\pm5$ $\pm6$ 311 8
ABE
2007
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$( ${{\mathit c}}{{\overline{\mathit c}}}$)
$3645.0$ $\pm5.5$ ${}^{+4.9}_{-7.8}$ 121
AUBERT
2005C
BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit c}}{{\overline{\mathit c}}}$
$3642.9$ $\pm3.1$ $\pm1.5$ 61
ASNER
2004
CLEO ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}^{\,'}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$3639$ $\pm7$ 98 9
AUBERT
2006E
BABR ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit K}^{\pm}}{{\mathit X}}_{{{\mathit c}} {{\overline{\mathit c}}}}$
$3630.8$ $\pm3.4$ $\pm1.0$ 112 10
AUBERT
2004D
BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}{(2S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$
$3654$ $\pm6$ $\pm8$ 39 11
CHOI
2002
BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit K}_{{{S}}}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$
$3594$ $\pm5$ 12
EDWARDS
1982C
CBAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}$ X
1  AAIJ 2017AD report ${\mathit m}_{{{\mathit \psi}{(2S)}}}–{\mathit m}_{{{\mathit \eta}_{{{c}}}{(2S)}}}$ = $52.5$ $\pm1.7$ $\pm0.6$ MeV. We use the current value ${\mathit m}_{{{\mathit \psi}{(2S)}}}$ = $3686.097$ $\pm0.025$ MeV to obtain the quoted mass.
2  From a fit of the ${{\mathit \phi}}{{\mathit \phi}}$ invariant mass with the width of ${{\mathit \eta}_{{{c}}}{(2S)}}$ fixed to the PDG 2016 value.
3  Ignoring possible interference with continuum.
4  With a width fixed to 11.3 MeV.
5  With a width fixed to 11.3 MeV. Using both ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ and ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ decays.
6  From a simultaneous fit to ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ and ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ decay modes.
7  Accounts for interference with non-resonant continuum.
8  From a fit of the ${{\mathit J / \psi}}$ recoil mass spectrum. Supersedes ABE,K 2002 and ABE 2004G.
9  From the fit of the kaon momentum spectrum. Systematic errors not evaluated.
10  Superseded by DEL-AMO-SANCHEZ 2011M.
11  Superseded by VINOKUROVA 2011.
12  Assuming mass of ${{\mathit \psi}{(2S)}}$ = 3686 MeV.
References