Highlights from the BESIII experiment

¹ University of Ferrara - Dipartimento di Fisica e Scienze della Terra, Ferrara, Italy
² Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Ferrara, Ferrara, Italy

^* e-mail: isabella.garzia@unife.it,garzia@fe.infn.it

Published online: 10 December 2024

Abstract

Since 2009, the BESIII experiment has been collecting e⁺e⁻ physics data in the energy range between 2.0 up to 4.95 GeV. This allowed the BESIII Collaboration to collect three of the largest data sets of charmonium J/ψ, ψ(2S), and ψ(3770) resonances in the world. In particular, the radiative decay of J/ψ provides a gluon-rich environment and it is therefore regarded as one of the most promising hunting grounds for glueballs, as well as a powerful tool for searching exotic states. In this proceeding, we present the first measurement of the quantum numbers of the X(2370) particle, which shows very promising glueball features, and the first observation of exotic isoscalar state η₁(1855) in the J/ψ → ηη′ decay. Latest studies on the η(1405)/η(1474) are also reported, together with the observation od a new state, X(1880), observed in the J/ψ → π(3π⁺π⁻) decay. Finally, the normalized differential cross section of inclusive π⁰, K⁰_S, and η production as a function of hadron momentum are are measured at several center of mass energies from 2.000 to 3.6710 GeV. The results deviates from several theoretical calculation based on existing fragmentation functions and provide new ingredient for global data fits.