Recent results on hadron physics at KLOE-2

Francesca Curciarello,M.N Achasov,P.P Krokovny,F.V Ignatov

doi:10.1051/epjconf/201921204003

Abstract

The KLOE-2 experiment at the Frascati φ−factory ended its data-taking in March 2018 collecting more than 5 fb−1 at the φ peak. The new data sample, together with the KLOE one, corresponds to 2.4 ×1010 φ and 3.1×108 η meson events. It represents the largest sample ever collected at the φ peak in e+e− colliders, allowing to study light mesons with unprecedented statistics. Recent results obtained with KLOE data on hadron physics e.g. – measurement of the running of the fine structure constant below 1 GeV, the combination of hadron cross section measurements with determination of $ a_\mu ^{\pi \pi } $, the new preliminary η → π+π− limit, and progress in γγ studies – will be presented.

Highlights

KLOE is a multi-purpose detector conceived to develop a wide-ranging physics program allowing to test fundamental symmetries of nature, search for processes beyond the Standard Model (SM), study rare meson decays and perform precise measurements in hadron physics
The KLOE-2 experiment at the Frascati φ−factory ended its datataking in March 2018 collecting more than 5 fb−1 at the φ peak
Recent results obtained with KLOE data on hadron physics e.g. – measurement of the running of the fine structure constant below 1 GeV, the combination of hadron cross section measurements with determination of aπμπ, the new preliminary η → π+π− limit, and progress in γγ studies – will be presented

Summary

Introduction

KLOE is a multi-purpose detector conceived to develop a wide-ranging physics program allowing to test fundamental symmetries of nature, search for processes beyond the Standard Model (SM), study rare meson decays and perform precise measurements in hadron physics. The KLOE detector has been upgraded for the KLOE-2 run with the installation of a inner tracker [3, 4] and two calorimeters [5] close to the interaction region (IP) , in order to improve vertex reconstruction near IP and increase tightness of the detector. KLOE and KLOE-2 full data sets (8 fb−1) are invaluable to perform precise measurements and study low energy hadron physics. In this paper most recent results on hadron physics obtained with the KLOE data and updates on the status of the γ∗γ∗ → π0 search with KLOE-2 data sample will be presented

Measurement of the running of the fine structure constant α

Findings

Conclusions