Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector
2013 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 720, no 1-3, 111-115 p.Article in journal (Refereed) Published
We present a new limit on the production of a light dark-force mediator with the KLOE detector at DA Phi NE. This boson, called U, has been searched for in the decay phi -> eta U, U -> e(+)e(-), analyzing the. decay eta -> pi(0)pi(0)pi(0) in a data sample of 1.7 fb(-1). No structures are observed in the e(+)e(-) invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta -> pi(+)pi(-)pi(0), increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7 x 10(-5) for 30 < M-U < 400 MeV and alpha'/alpha <= 8 x 10(-6) for the sub-region 50 < M-U <210 MeV. This result assumes the Vector Meson Dominance expectations for the phi eta gamma* transition form factor. The dependence of this limit on the transition form factor has also been studied.
Place, publisher, year, edition, pages
2013. Vol. 720, no 1-3, 111-115 p.
e(+)e(-) Collisions, Dark forces, Gauge vector boson
IdentifiersURN: urn:nbn:se:uu:diva-198920DOI: 10.1016/j.physletb.2013.01.067ISI: 000316513500009OAI: oai:DiVA.org:uu-198920DiVA: diva2:619065