Measurement of the $K(S) \to \gamma \gamma$ branching ratio using a pure K(S) beam with the KLOE detector - INSPIRE

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Measurement of the $K(S) \to \gamma \gamma$ branching ratio using a pure K(S) beam with the KLOE detector

KLOE

Collaboration

•

F. Ambrosino
(
- Naples U. and
- INFN, Naples
)

Dec, 2007

13 pages

Published in:

JHEP 05 (2008) 051

e-Print:

0712.1744 [hep-ex]

DOI:

10.1088/1126-6708/2008/05/051

PDG:

{{\mathit K}_S^0}

\rightarrow

{{\mathit \gamma}}{{\mathit \gamma}}

Experiments:

FRASCATI-DAFNE-KLOE

View in:

ADS Abstract Service

reference search19 citations

Citations per year

Abstract: (arXiv)

We have searched for the decay KS->gg in a sample of 2x10^9 phi->KS KL decays collected at DAPHNE with an integrated luminosity of 1.9 fb^{-1}. KS are tagged by the KL interaction in the calorimeter. Two prompt photons must also be detected. Kinematic constraints reduce the initial 6x10^5 events to 2740 candidates, from which a signal of 711\pm 35 events is extracted. By normalizing to the KS->2pi^0 decays counted in the same sample, we measure BR(KS->gg)= (2.26\pm0.12_{stat}\pm0.06_{syst})x10^{-6}, in agreement with O(p^4) Chiral Perturbation Theory predictions.

Note:

13 pages, 9 figures

e+ e- collisions
DAFNE
KLOE
rare K(S) decays
chiPT
electron positron: colliding beams
Phi(1020): electroproduction
K0: pair production
K0(S): radiative decay
final state: two-photon

References(16)

Figures(0)

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,
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(
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)
,
F Ambrosino
(
- INFN, Naples and
- Naples U.
)
,
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(
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- Rome U., Tor Vergata
)
,
F. Ambrosino
(
- INFN, Naples and
- Naples U.
)
,
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(
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)
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M Adinolfi
(
- INFN, Rome2 and
- Rome U., Tor Vergata
)
,
F Ambrosino
(
- INFN, Naples and
- Naples U.
)
,
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(
- Frascati
)
,
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(
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)
,
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)

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KLOE

Collaboration

•

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(
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)

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KLOE

Collaboration

•

F. Ambrosino
(
- INFN, Naples and
- Naples U.
)

et al.

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•
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•
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