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Measurement of the ϕ→π0e+e− transition form factor with the KLOE detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
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Number of Authors: 65
2016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 757, 362-367 p.Article in journal (Refereed) Published
Abstract [en]

A measurement of the vector to pseudoscalar conversion decay ϕ→π0e+e− with the KLOE experiment is presented. A sample of ∼9500 signal events was selected from a data set of 1.7 fb−1 of e+e− collisions at s√∼mϕ collected at the DAΦNE e+e− collider. These events were used to obtain the first measurement of the transition form factor |Fϕπ0(q2)| and a new measurement of the branching ratio of the decay: BR(ϕ→π0e+e−)=(1.35±0.05+0.05−0.10)×10−5. The result improves significantly on previous measurements and is in agreement with theoretical predictions.

Place, publisher, year, edition, pages
2016. Vol. 757, 362-367 p.
Keyword [en]
e(+)e(-) collisions; Conversion decay; Transition form factor
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-289057DOI: 10.1016/j.physletb.2016.04.015ISI: 000376800300049OAI: oai:DiVA.org:uu-289057DiVA: diva2:924680
Funder
EU, European Research Council, RII3-CT-2004-506078EU, FP7, Seventh Framework Programme, FP7-INFRASTRUCTURES-2008-1 227431
Available from: 2016-04-28 Created: 2016-04-28 Last updated: 2017-11-30Bibliographically approved

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Caldeira Balkeståh, LiCao, BoHeijkenskjöld, LenaIkegami Andersson, WalterJohansson, TordKupsc, AndrzejPapenbrock, MichaelWolke, Magnus
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