Recent Advances in Hadron Production in $e^+e^-$ Annihilation at BESIII

TL;DR

This paper reports recent experimental results from BESIII on hadron production in electron-positron collisions, including cross-section measurements, flavor symmetry breaking, and searches for rare deuteron production, advancing understanding of hadron dynamics and flavor physics.

Contribution

It provides new experimental measurements and observations of hadron production, flavor symmetry breaking, and rare decay processes at BESIII, expanding knowledge in the energy regime of 3.5 to 25 GeV.

Findings

Measured cross-sections of various baryon-antibaryon pairs.

Observed significant flavor-SU(3) breaking in kaon wave functions.

Discovered evidence of rare decay processes involving $ ext{psi}(3770)$ and $ ext{psi}(4160)$.

Abstract

This talk presents recent experimental findings at BESIII experiment, including three distinct studies. Firstly, it reports the measurements of the Born cross-sections of $e^+e^-\to\Sigma^+\bar\Sigma^-$, $\Xi^-\bar\Xi^+$, $K^{0}_{S}K^{0}_{L}$ and $K^-\bar\Xi^+\Lambda/\Sigma^0+c.c.$ at center-of-mass energies between 3.5 and 4.9 GeV. Secondly, it delves into the observation of significant flavor-SU(3) breaking in the kaon wave function at 12 GeV$^2$$<Q^2<$25 GeV$^2$, the discovery of $\psi(3770)\to K^{0}_{S}K^{0}_{L}$ and the evidence of $\psi(4160)\to K^-\bar\Xi^+\Lambda+c.c.$. Thirdly, it discusses the search for the production of deuterons in $e^+e^-$ annihilation at center-of-mass energies between 4.1 and 4.7 GeV in the reactions of $e^+e^-\to pp\pi^-\bar{d}+c.c.$ and $pp\bar{p}\bar{n}\pi^-+c.c.$. These results offer new perspectives on hadron production in the baryonic final states and the flavor dynamics within the kaon wave function, and the rare decay processes involving the $\psi(3770)$ resonance, contributing to our understanding of hadron dynamics in this energy regime through baryon final states produced in $e^+e^-$ collisions.