EPJ Web Conf.
Volume 130, 2016MESON 2016 – 14th International Workshop on Meson Production, Properties and Interaction
|Number of page(s)||4|
|Section||07 Other topics - contributions|
|Published online||29 November 2016|
Search for dark forces with KLOE
Institute of Physics, Jagiellonian University, ul. Łojasiewicza 11, 30-348 Cracow, Poland
* e-mail: email@example.com
Published online: 29 November 2016
During the last years several Dark Sector Models have been proposed in order to address striking astrophysical observations which failed standard interpretations. In the minimal case a new vector particle, the so called dark photon, or A′ or U boson, is introduced, with small coupling with Standard Model particles. Also, the existence of a dark Higgs boson h′ is postulated, in analogy with the Standard Model, to give mass to the U boson through the Spontaneous Symmetry Breaking mechanism. The KLOE experiment working at DAΦNE, an e+e− collider operating in Frascati (near Rome), searched for the existence of the U boson investigating three different processes and six different final states: (1) in Dalitz decays of the ϕ meson ϕ → ηU, with U → e+e− and η → π+π−π0 and π0π0π0, (2) in e+e− → Uh′ events, with U decaying into lepton and pion pairs, (3) in the dark Higgsstrahlung process, e+e− → Uh′, U → μ+μ−, h′ invisible. Limits on the model parameters have been set at 90 % CL for U boson masses below 1 GeV. Further improvements are expected in terms of sensitivity and discovery potential with the new KLOE-2 detector.
© The Authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Initial download of the metrics may take a while.