Measurement of $\sigma(e^+ e^- \to \pi^+ \pi^- \gamma(\gamma)$ and the dipion contribution to the muon anomaly with the KLOE detector - INSPIRE

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Measurement of $\sigma(e^+ e^- \to \pi^+ \pi^- \gamma(\gamma)$ and the dipion contribution to the muon anomaly with the KLOE detector

KLOE

Collaboration

•

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

Sep, 2008

15 pages

Published in:

Phys.Lett.B 670 (2009) 285-291

e-Print:

0809.3950 [hep-ex]

DOI:

10.1016/j.physletb.2008.10.060

Experiments:

FRASCATI-DAFNE-KLOE

View in:

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Abstract: (Elsevier)

We have measured the cross section σ(e+e−→π+π−γ(γ)) at DAΦNE, the Frascati ϕ -factory, using events with initial state radiation photons emitted at small angle and inclusive of final state radiation. We present the analysis of a new data set corresponding to an integrated luminosity of 240 pb −1 . We have achieved a reduced systematic uncertainty with respect to previously published KLOE results. From the cross section we obtain the pion form factor and the contribution to the muon magnetic anomaly from two-pion states in the mass range 0.592

Note:

Minor text revisions, version to appear on Physics Letters B

13.60.Hb
13.66.Jn
13.40.Gp
13.66.Bc
Hadronic cross section
Initial state radiation
Pion form factor
Muon anomaly
electron positron: annihilation
pi: pair production

References(23)

Figures(2)

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Collaboration

•

F. Ambrosino
(
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)

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)
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