In 2024, the Spin-Parity quantum numbers of the X(2370) particle was determined to be 0^-+ for the first time by the BESIII collaboration and its mass is found to be consistent with the theoretically predicted mass of the lightest pseudoscalar glueball. This important experimental measurement supports the interpretation of the X(2370) as the lightest pseudoscalar glueball and it was published in the journal of  Physical Review Letters  (PRL) on the 2nd of May, 2024 as PRL Editor's Suggestion (PRL 132 (2024) 181901). Recently, this letter was selected into the Physical Review Letters Collection of the Year 2024, i.e., the most important papers in 2024.
Each year Physical Review Letters publishes about 2000-2500 Letters with about 400 of those papers to highlight as Editor's Suggestions. Based on that, a more concentrated distillation of some of the most important and interesting papers in physics and relative areas are selected. There are about ~50 papers in Physical Review Letters Collection of the Year 2024,  including the achievement of determination of spin-parity quantum numbers of the X(2370) particle from the BESIII experiment. It is the first time that a BESIII physics paper was selected into the PRL collection of the most important papers and this is the only paper selected in the field of hadron physics in 2024.
For detailed, please see :  https://promo.aps.org/PRL2024