PoS - Proceedings of Science
Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Dark Matter (Parallel Session). Coveners: Enrique Araujo; Caterina Doglioni; Alfredo Urbano. Scientific Secretary: Caterina Braggio.
KLOE/KLOE-2 results and perspectives on dark force search
G. Mandaglio*  on behalf of the KLOE-2 Collaboration
Full text: pdf
Pre-published on: October 19, 2017
Published on: March 20, 2018
Abstract
Different astrophysical anomalies could find
explanation on the existence of a new kind of matter, dark matter, stimulating the search for mediator of a new force, called dark photon (U boson, $A^\prime$), coupling weakly with Standard Model particles.
The KLOE experiment searched for the existence of the dark photon investigating three different processes: dalitz decays of the $\Phi$ meson $\Phi\to \eta U$, the production from continuum $e^+e^- \to U \gamma$, the dark Higgsstrahlung $e^+e^- \to Uh'$. No evidence was found and limits on the model parameters have been set at 90\% confidence level.
A reanalysis on the $e^+e^- \to U \gamma$ with U decaying into muon pairs at 1.93 fb$^{-1}$ was performed and new preliminary 90\% CL upper limits obtained with this data sample and by the combination of these events with the U boson decaying into pions pairs will be presented.
The upgraded detector KLOE-2 is collecting data with new beam crossing scheme of \DAF\ since November 2014.
The analyses of new data could improve the sensitivity of these investigated processes by a factor two profiting of the higher statistics and the improvement on the momentum and interaction vertex resolution. Moreover, a single photon trigger has been implemented in data taking and will allow the search of the dark photon through its invisible decays in light dark matter particles.
DOI: https://doi.org/10.22323/1.314.0073
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