Measurement of the pseudoscalar mixing angle and eta-prime gluonium content with KLOE detector

Ambrosino, F.; Antonelli, A.; Antonelli, M.; Bacci, C.; Beltrame, P.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocchetta, S.

doi:10.1016/j.physletb.2007.03.032

Measurement of the pseudoscalar mixing angle and eta-prime gluonium content with KLOE detector

KLOE

Collaboration

•

F. Ambrosino

Dec, 2006

13 pages

Published in:

Phys.Lett.B 648 (2007) 267-273

e-Print:

hep-ex/0612029 [hep-ex]

DOI:

10.1016/j.physletb.2007.03.032

PDG:

{{\mathit \phi}{(1020)}}

\rightarrow

{{\mathit \eta}^{\,'}{(958)}}{{\mathit \gamma}}

Experiments:

FRASCATI-DAFNE-KLOE

View in:

ADS Abstract Service

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reference search146 citations

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Abstract:

We have measured the ratio

R_{\phi}=BR(\phi \to \eta^{\prime} \gamma)/BR(\phi \to \eta \gamma)

by looking for the radiative decays

\phi \to \eta^{\prime} \gamma

and

\phi \to \eta \gamma

in the final states

\pi^+\pi^-

7

\gamma

's and 7

\gamma

's respectively, in a sample of

\sim 1.3\cdot 10^{9}

\phi

mesons produced at the Frascati

\phi

-factory. We obtain

R_{\phi}=(4.77\pm0.09_{stat}\pm0.19_{sys})\cdot 10^{-3}

from which we derive

BR(\phi \to \eta^{\prime} \gamma)=(6.20\pm0.11_{stat}\pm0.25_{sys})\cdot 10^{-5}

. In the hypothesis of no gluonium content we extract the pseudoscalar mixing angle in the quark-flavor basis

\phi_P=(41.4\pm0.3_{stat}\pm0.7_{sys}\pm0.6_{th})^{\circ}

. Combining the value of

R_{\phi}

with other constraints, we estimate the gluonium fractional content of

\eta^{\prime}

meson as

Z^2 = 0.14\pm0.04

and the mixing angle

\phi_P = (39.7\pm0.7)^{\circ}

.

13.65.+i
14.40.Aq
e+e- collisions
Radiative phi decays
Pseudoscalar mixing angle
e+e− collisions
Radiative ϕ decays
[formula omitted] collisions
electron positron: colliding beams
electron positron: annihilation

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