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Precision measurement of sigma (e(+)e(-) -> pi(+)pi(-)gamma)/sigma(e(+)e(-) ->mu(+)mu(-)gamma) and determination of the pi(+)pi(-) contribution to the muon anomaly with the KLOE detector
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2013 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 720, no 4-5, 336-343 p.Article in journal (Refereed) Published
Abstract [en]

We have measured the ratio cr (e(+)e(-) -> pi(+)pi(-)gamma)/sigma(e(+)e(-) -> mu(+)mu(-)gamma), with the KLOE detector at DA Phi NE for a total integrated luminosity of similar to 240 pb(-1). From this ratio we obtain the cross section sigma (e(+)e(-) -> pi(+)pi(-)gamma). From the cross section we determine the pion form factor vertical bar F-pi vertical bar(2) and the two-pion contribution to the muon anomaly a(mu) for 0.592< M-pi pi < 0.975 GeV, Delta(pi pi) a(mu) = (385.1 +/- 1.1(stat) +/- 2.7(sys+theo)) x 10(-10). This result confirms the current discrepancy between the Standard Model calculation and the experimental measurement of the muon anomaly. (c) 2013 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2013. Vol. 720, no 4-5, 336-343 p.
Keyword [en]
e(+)e(-) collisions, Initial state radiation, Pion form factor, Muon anomaly
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-199726DOI: 10.1016/j.physletb.2013.02.029ISI: 000317151500005OAI: oai:DiVA.org:uu-199726DiVA: diva2:621050
Available from: 2013-05-13 Created: 2013-05-13 Last updated: 2013-05-13Bibliographically approved

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Balkestahl, Li CaldeiraHeijkenskjöld, LenaHöistad, BoJacewicz, MarekJohansson, TordKupsc, AndrzejWolke, Magnus
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Nuclear PhysicsHigh Energy PhysicsDepartment of Physics and Astronomy
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Physics Letters B
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