Measurement of Proton Electromagnetic Form Factors in $e^{+}e^{-}\top\bar{p}$ in the Energy Region 2.00–3.08 GeV
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影响因子：9.227
DOI码：10.1103/PhysRevLett.124.042001
所属单位：American Physical Society
发表刊物：Phys. Rev. Lett
刊物所在地：美国
摘要：The process of $e^{+}e^{-}\to p\bar{p}$ is studied at 22 center-of-mass energy points ($\sqrt{s}$) from 2.00 to 3.08 GeV, exploiting 688.5 pb$^{−1}$ of data collected with the BESIII detector operating at the BEPCII collider. The Born cross section ($\sigma_{p\bar{p}}$) of $e^{+}e^{-}\to p\bar{p}$ is measured with the energy-scan technique and it is found to be consistent with previously published data, but with much improved accuracy. In addition, the electromagnetic form-factor ratio ($|G_{E}/G_{M}|$) and the value of the effective ($|G_{\text{eff}}$), electric ($|G_{E}|$), and magnetic ($|G_{M}|$) form factors are measured by studying the helicity angle of the proton at 16 center-of-mass energy points. $|G_{E}/G_{M}|$ and $|GM|$ are determined with high accuracy, providing uncertainties comparable to data in the spacelike region, and $|GE|$ is measured for the first time. We reach unprecedented accuracy, and precision results in the timelike region provide information to improve our understanding of the proton inner structure and to test theoretical models which depend on nonperturbative quantum chromodynamics.
第一作者：夏磊
论文类型：期刊论文
论文编号：Phys. Rev. Lett. 124.042001 (2020)
学科门类：理学
文献类型：J
卷号：124
期号：4
页面范围：042001
ISSN号：0031-9007
是否译文：否
发表时间：2020-01-28
收录刊物：SCI
发布期刊链接：https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.042001
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