Abstract
The DAΦNE Φ-factory is an ideal place to search for forces beyond the Standard Model. By using the KLOE detector, limits on U-boson coupling e 2 of the order of 10−5 ÷ 10−7 and on the αD × e 2 product have been set through the study of the Φ Dalitz decay, Uγ events and the Higgsstrahlung process. An improvement of these limits is expected thanks to the KLOE detector and DAΦNE upgrades of KLOE-2.
Highlights
FiQj ED h Fidjark χAt KLOE-2, dark forces can be probed by using different approaches involving meson decays, Uγ radiative return processes and Higgsstrahlung.In the following we will report on the status of dark forces searches at KLOE/KLOE-2.DAΦNE is an e+e− collider running at the energy √s = mφ = 1.0195 GeV which is located at the National Laboratories of Frascati of INFN
The limit was set by using the Confidence Level Signal (CLS) technique [23,24,25,26]
We extracted the limit on the number of U-boson candidates through the CLS technique [23,24,25,26] by comparing the expected and observed μ+μ−γ yield, and a Monte Carlo (MC) generation of the U-boson signal which takes into account the Mμμ invariant mass resolution (1.5 MeV to 1.8 MeV as Mμμ increases), see Fig. 7
Summary
DAΦNE is an e+e− collider running at the energy √s = mφ = 1.0195 GeV which is located at the National Laboratories of Frascati of INFN. The KLOE detector is made up of a large cylindrical drift chamber (DC), surrounded by a lead scintillating fiber electromagnetic calorimeter (EMC). The EMC provides measurement of photon energies, impact point and an accurate measurement of the time of arrival of particles. The DC is well suited for tracking of the particles and reaction vertex reconstruction. The momentum resolution is σp⊥ /p⊥ better than 0.4% for large angle tracks. Vertices are reconstructed with a spatial resolution of ∼ 3 mm
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