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Study of the Dalitz decay phi -> eta e(+)e(-) with the KLOE detector
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2015 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 742, 1-6 p.Article in journal (Refereed) Published
Abstract [en]

We have studied the vector to pseudoscalar conversion decay phi -> eta e(+)e(-), with.. eta -> pi(0)pi(0)pi(0), with the KLOE detector at DA phi NE. The data set of 1.7 fb(-1) of e(+)e(-) collisions at root s similar to M-phi contains a clear conversion decay signal of similar to 31,000 events from which we measured a value of BR(phi -> eta e(+)e-) = (1.075 +/- 0.007 +/- 0.038) x 10(-4). The same sample is used to determine the transition form factor by a fit to the e(+)e(-) invariant mass spectrum, obtaining b(phi eta)=( 1.28 +/- 0.10(-0.08)(+0.09)) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations.

Place, publisher, year, edition, pages
2015. Vol. 742, 1-6 p.
Keyword [en]
e(+)e(-) collisions, Conversion decay, Transition form factor
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-251429DOI: 10.1016/j.physletb.2015.01.011ISI: 000350555900001OAI: oai:DiVA.org:uu-251429DiVA: diva2:807360
Available from: 2015-04-23 Created: 2015-04-17 Last updated: 2016-05-11Bibliographically approved

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Balkeståhl, Li CaldeiraHeijkenskjöld, LenaHöistad, BoJohansson, TordKupsc, AndrzejWolke, Magnus
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