${{\mathit \eta}_{{{c}}}{(1S)}}$ WIDTH

INSPIRE   PDGID:
M026W
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 30.5 \pm0.5}$ OUR FIT  Error includes scale factor of 1.2.
$\bf{ 30.5 \pm0.5}$ OUR AVERAGE  Error includes scale factor of 1.1.
$29.7$ $\pm0.5$ $\pm0.2$ 35k
AAIJ
2023AH
 LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}$( ${{\mathit K}_S^0}$ ${{\mathit K}}{{\mathit \pi}}$)
$33.8$ $\pm1.6$ $\pm4.1$ 1705
ABLIKIM
2019AV
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \omega}}{{\mathit \omega}}$
$30.8$ ${}^{+2.3}_{-2.2}$ $\pm2.9$ 2673
XU
2018
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \eta}^{\,'}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$34.0$ $\pm1.9$ $\pm1.3$ 11k
AAIJ
2017AD
 LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit B}^{+}}{{\mathit X}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit K}^{+}}{{\mathit X}}$
$31.4$ $\pm3.5$ $\pm2.0$ 6.4k 1
AAIJ
2017BB
 LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit X}}$ $\rightarrow$ 2( ${{\mathit K}^{+}}{{\mathit K}^{-}}$) ${{\mathit X}}$
$27.2$ $\pm3.1$ ${}^{+5.4}_{-2.6}$ 2
ANASHIN
2014
KEDR ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$
$25.2$ $\pm2.6$ $\pm2.4$ 4.5k 3, 4
LEES
2014E
 BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$
$34.8$ $\pm3.1$ $\pm4.0$ 900 3, 5, 4
LEES
2014E
 BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}}$
$32.0$ $\pm1.2$ $\pm1.0$ 6, 7
ABLIKIM
2012F
 BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$
$36.4$ $\pm3.2$ $\pm1.7$ 832 3
ABLIKIM
2012N
 BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \gamma}}$ hadrons
$37.8$ ${}^{+5.8}_{-5.3}$ $\pm3.1$ 486
ZHANG
2012A
 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \eta}^{\,'}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$36.2$ $\pm2.8$ $\pm3.0$ 11k
DEL-AMO-SANCH..
2011M
 BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$35.1$ $\pm3.1$ ${}^{+1.0}_{-1.6}$ 920 7
VINOKUROVA
2011
BELL ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit K}^{\pm}}({{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$)
$31.7$ $\pm1.2$ $\pm0.8$ 14k 8
LEES
2010
BABR 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$36.3$ ${}^{+3.7}_{-3.6}$ $\pm4.4$ 0.9k
AUBERT
2008AB
 BABR ${{\mathit B}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}{(1S)}}{{\mathit K}^{(*)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}{{\mathit K}^{(*)}}$
$28.1$ $\pm3.2$ $\pm2.2$ 7.5k
UEHARA
2008
BELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}}$ $\rightarrow$ hadrons
$48$ ${}^{+8}_{-7}$ $\pm5$ 195
WU
2006
BELL ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit K}^{+}}$
$40$ $\pm19$ $\pm5$ 20
WU
2006
BELL ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit K}^{+}}$
$24.8$ $\pm3.4$ $\pm3.5$ 592
ASNER
2004
CLEO ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}^{\,'}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$20.4$ ${}^{+7.7}_{-6.7}$ $\pm2.0$ 190
AMBROGIANI
2003
E835 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
$23.9$ ${}^{+12.6}_{-7.1}$
ARMSTRONG
1995F
 E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$32.1$ $\pm1.1$ $\pm1.3$ 12k 9
DEL-AMO-SANCH..
2011M
 BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$34.3$ $\pm2.3$ $\pm0.9$ 2.5k 10
AUBERT
2004D
 BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$
$17.0$ $\pm3.7$ $\pm7.4$ 11
BAI
2003
BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$
$29$ $\pm8$ $\pm6$ 180 12
FANG
2003
BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}}{{\mathit K}}$
$11.0$ $\pm8.1$ $\pm4.1$ 13
BAI
2000F
 BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$ and ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$
$27.0$ $\pm5.8$ $\pm1.4$ 14
BRANDENBURG
2000B
 CLE2 ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}}$ $\rightarrow$ ${{\mathit K}^{\pm}}{{\mathit K}_S^0}$ ${{\mathit \pi}^{\mp}}$
$7.0$ ${}^{+7.5}_{-7.0}$ 12
BAGLIN
1987B
 SPEC ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
$10.1$ ${}^{+33.0}_{-8.2}$ 23 15
BALTRUSAITIS
1986
MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit p}}{{\overline{\mathit p}}}$
$11.5$ $\pm4.5$
GAISER
1986
CBAL ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$ X, ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X
$< 40 90\% CL$ 18
HIMEL
1980B
 MRK2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$
$< 20 90\% CL$
PARTRIDGE
1980B
 CBAL ${{\mathit e}^{+}}{{\mathit e}^{-}}$
1  From a fit of the ${{\mathit \phi}}{{\mathit \phi}}$ invariant mass with the mass and width of ${{\mathit \eta}_{{{c}}}{(1S)}}$ as free parameters.
2  Taking into account an asymmetric photon lineshape.
3  With floating mass.
4  Ignoring possible interference with the non-resonant 0${}^{-}$ amplitude.
5  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 six decay modes of the ${{\mathit \eta}_{{{c}}}}$.
7  Accounts for interference with non-resonant continuum.
8  Taking into account interference with the non-resonant $\mathit J{}^{P} = 0-$ amplitude.
9  Not independent from the measurements reported by LEES 2010.
10  Superseded by LEES 2010.
11  From a simultaneous fit of five decay modes of the ${{\mathit \eta}_{{{c}}}}$.
12  Superseded by VINOKUROVA 2011.
13  From a fit to the 4-prong invariant mass in ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$ and ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$ decays.
14  Superseded by ASNER 2004.
15  Positive and negative errors correspond to 90$\%$ confidence level.
References
see fit info