This document reviews the physics program of the KLOE-2 detector at DA\(\Phi\)NE upgraded in energy and provides a simple solution to run the collider above the \(\phi\)-peak (up to 2, possibly 2.5 ...GeV). It is shown how a precise measurement of the multihadronic cross section in the energy region up to 2 (possibly 2.5) GeV would have a major impact on the tests of the Standard Model through a precise determination of the anomalous magnetic moment of the muon and the effective fine-structure constant at the \(M_Z\) scale. With a luminosity of about \(10^{32}\)cm\(^{-2}\)s\(^{-1}\), DA\(\Phi\)NE upgraded in energy can perform a scan in the region from 1 to 2.5 GeV in one year by collecting an integrated luminosity of 20 pb\(^{-1}\) (corresponding to a few days of data taking) for single point, assuming an energy step of 25 MeV. A few years of data taking in this region would provide important tests of QCD and effective theories by \(\gamma\gamma\) physics with open thresholds for pseudo-scalar (like the \(\eta'\)), scalar (\(f_0,f'_0\), etc...) and axial-vector (\(a_1\), etc...) mesons; vector-mesons spectroscopy and baryon form factors; tests of CVC and searches for exotics. In the final part of the document a technical solution for the energy upgrade of DA\(\Phi\)NE is proposed.
Investigation at a \(\phi\)--factory can shed light on several debated issues in particle physics. We discuss: i) recent theoretical development and experimental progress in kaon physics relevant for ...the Standard Model tests in the flavor sector, ii) the sensitivity we can reach in probing CPT and Quantum Mechanics from time evolution of entangled kaon states, iii) the interest for improving on the present measurements of non-leptonic and radiative decays of kaons and eta/eta\(^\prime\) mesons, iv) the contribution to understand the nature of light scalar mesons, and v) the opportunity to search for narrow di-lepton resonances suggested by recent models proposing a hidden dark-matter sector. We also report on the \(e^+ e^-\) physics in the continuum with the measurements of (multi)hadronic cross sections and the study of gamma gamma processes.
The aim of the SIDDHARTA-2 experiment is to perform the first measurement ever of the width and shift induced by the strong interaction to the 2p→1s energy transition of kaonic deuterium. This ...ambitious goal implies a challenging task due to the very low X-ray yield of kaonic deuterium, which is why an accurate and thorough characterization of the experimental apparatus is mandatory before starting the data-taking campaign. Helium-4 is an excellent candidate for this characterization since it exhibits a high yield in particular for the 3d→2p transition, roughly 100 times greater than that of the kaonic deuterium. The ultimate goal of the work reported in this paper is to study the performances of the full experimental setup in view of the kaonic deuterium measurement. This is carried out by measuring the values of the shift and the width for the 3d→2p energy transition of kaonic helium-4, induced by the strong interaction. The values obtained for these quantities, for a total integrated luminosity of ∼31/pb, are ε2p=2.0±1.2(stat)±1.5(syst)eV and Γ2p=1.9±5.7(stat)±0.7(syst)eV. The results, compared to the value of the shift measured by the SIDDHARTA experiment ε2p=0±6(stat)±2(syst)eV, show a net enhancement of the resolution of the apparatus, providing strong evidence of the potential to perform the challenging measurement of the kaonic deuterium.
The excellent quality kaon beam provided by the
DA
\Phi
Φ
NE
collider of LNF-INFN (Italy) together with SIDDHARTA/SIDDHARTA-2 new
experimental techniques, as very precise and fast-response X-ray
...detectors, allow to perform unprecedented measurements on light kaonic
atoms crucial for a deeper understanding of the low-energy quantum
chromodynamics (QCD) in the strangeness sector. In this paper an
overview of the main results obtained by the SIDDHARTA collaboration, as
well as the future plans related to the SIDDHARTA-2 experiment, are
discussed.
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