The KLOE-2 experiment: Overview of recent results

Abstract

on behalf of the KLOE-2 Collaboration Received Day Month Year Revised Day Month YearThe KLOE detector at the DAΦNE φ-factory has been operating in two periods from 2001 to 2006 and from 2014 to 2018 collecting a large sample of φ-meson decays. This allowed to perform precision measurements and studies of fundamental symmetries, and searches of New Physics phenomena. In this overview, the results of KLOE and KLOE-2 Collaborations are presented. The most recent results from the KLOE experiment are discussed, covering: the measurement of the running fine-structure constant αem, the Dalitz plot measurement of η → π + π − π 0 , the search of a U boson, tests of discrete symmetries and quantum decoherence.

Study of Entangled K-meson and Its Decoherence

“…From these results, we know that the value of both parameters are close to zero relative to or . These values are in accordance with other works which get the value of the decoherence parameter close to zero [17], [21], [29]. It means the interaction between the system and environment does not affect the system significantly.…”

“…However, interaction between a quantum system and its environment can cause quantum effects to disappear. This phenomenon, called decoherence, could be measured quantitatively [7], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22]. On the other hand, open quantum theory, related to quantum transport [23], [24], [25], explains a total system which contains the system of interest and environment [26], [27], [28].…”

“…Among any other type of particles, K-meson is relatively interesting because we can study basics of quantum mechanics, Bell Inequality, and symmetry (T, CP, and CPT) with the help of interference phenomenon in K-meson studies. These studies are feasible because of mass difference value between (short-lived-state) and (long-lived-state) as well as lifetime [16], [20], [21], [29]. Therefore, in this paper, the entangled K-meson system and its decoherence phenomenon are studied.…”

Hadron Physics results at KLOE-II experiment

“…The KLOE-2 setup is a multi-purpose detector located in Frascati, Italy. It is designed for a broad physics program which includes, tests of fundamental symmetries of nature, search for processes beyond the Standard Model (SM), study rare meson decays and perform precise measurements in hadron physics [1,2]. The experimental setup consists of a central tracking detector made up of a large cylindrical drift chamber (DC) [3] and a lead-scintillating fiber electromagnetic calorimeter [4] embedded in 0.5 T magnetic field.…”