Observation of eta-prime(c) production in gamma gamma fusion at CLEO - INSPIRE

DataBETA

Observation of eta-prime(c) production in gamma gamma fusion at CLEO

CLEO

Collaboration

•

D.M. Asner
(
- Pittsburgh U.
)

Dec, 2003

8 pages

Published in:

Phys.Rev.Lett. 92 (2004) 142001

e-Print:

hep-ex/0312058 [hep-ex]

DOI:

10.1103/PhysRevLett.92.142001

PDG:

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

\rightarrow

{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}

Report number:

CLNS-03-1853,
CLEO-03-14

Experiments:

CESR-CLEO-II,
CESR-CLEO-III

View in:

ADS Abstract Service

reference search173 citations

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Abstract:

We report on the observation of the eta_{c}^{prime}(2^{1}S_{0}), the radial excitation of eta_{c}(1^{1}S_{0}) ground state of charmonium, in the two-photon fusion reaction gamma gamma rightarrow eta_{c}^{prime} rightarrow K_{S}^{0}K^{pm}pi^{mp} in 13.6 fb^{-1} of CLEO II/II.V data and 13.1 fb^{-1} of CLEO III data. We obtain M(eta_{c}^{prime})=3642.9 pm 3.1(stat) pm1.5(syst) MeV, and M(eta_{c})=2981.8 pm1.3(stat) pm 1.5(syst) MeV. The corresponding values of hyperfine splittings between ^{1}S_{0} and ^{3}S_{1} states are \Delta M_{hf}(1S)=115.1 pm 2.0 MeV, Delta M_{hf}(2S)=43.1 pm3.4 MeV. Assuming that the eta_{c} and eta_{c}^{prime} have equal branching fractions to K_{S}K pi, we obtain Gamma_{gamma gamma}(eta_{c}^{prime})=1.3 pm 0.6 keV.

electron positron: colliding beams
exchange: two-photon
photon photon: exclusive reaction
eta/c(2980): photoproduction
eta/c(3590): photoproduction
eta/c(3590): hadronic decay
eta/c(3590): mass
eta/c(3590): width
mass spectrum: (K0(S) K pi)
CLEO

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Figures(0)

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