Year: 2026
Type: preprint
Abstract: This paper uses the data corresponding to an integrated luminosity of $495$~pb$^{-1}$ in the center-of-mass energy region from 3.58~GeV to 3.71~GeV to study the relative phase between strong and electromagnetic amplitudes in the $ψ(2S)\to p\bar{p}$ decay. The cross sections and the effective form factors around $ψ(2S)$ of proton-antiproton pairs are presented thereby filling the gap in the experimental results around the $ψ(2S)$ resonance for the first time, and the results are consistent with the previous BESIII and BaBar results. The relative phase is extracted from the cross-section line shape as $Φ_{g,γ}=(105.9\pm9.4)^\circ$ or $Φ_{g,γ}=(-105.3\pm9.1)^\circ$. Correspondingly, two solutions for the $ψ(2S)\to p\bar{p}$ branching fractions are obtained as $\mathcal{B}=(3.21\pm0.13)\times10^{-4}$ and $\mathcal{B}=(3.47\pm0.19)\times10^{-4}$. These results support the universality of the phase and provide new insights into its underlying mechanism.
Source: arXiv (Cornell University)
Author: The BESIII Collaboration
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Department of Energy, Strong, National Research Foundation, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Chinese Academy of Sciences, National Research Foundation of Korea, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Istituto Nazionale di Fisica Nucleare, Shanghai Key Laboratory for Particle Physics and Cosmology, Science and Technology Facilities Council, Institute of High Energy Physics, H2020 European Research Council
Awards: G1094733649, G1612394202, G1652990914, G1907155555, BESIII上正反超子对关联产生及其衰变的实验研究, G2084762544, G222768804, G2486873139, G2777307501, G2986027706, G3107731600, G3234280719, G328816031, BESIII上胶球的寻找和轻介子谱的研究, G3534486373, G3790219004, G387734, G466842207, G4883783264, The search for new physics through precision measurements of the CKM angle gamma, G5170186115, G567888578, G6040273958, G6119985531, 北京谱仪III上Ds衰变的实验研究, G6371861488, 北京正负电子对撞机BESIII实验上粲重子Λc研究, G6746531785, G6845169765, G6927153966, G7200992521, G7692396955, G783835211, G7921044504, G8158558910, G8396383697, G8644667100, UNDERSTANDING QCD IN THE LIGHT MESON SECTOR (WITH EXPHASIS ON MAPPING GLUONIC EXCITATIONS) USING PION AND PHOTON PROBES, G904559116, G945438540, G965723986
OpenAlex ID: W7203685663