Measurement of Λ baryon polarization in e+e− → ΛΛ-bar at sqrt{s}=3.773 GeV
Measurement of Λ baryon polarization in e+e− → ΛΛ-bar at sqrt{s}=3.773 GeV
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在 sqrt{s}=3.773 GeV 处测量 e e−−−−−bar 中的 δ 重子偏振
DOI：
10.1103/physrevd.105.l011101
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Briere R.
中科院分区：
文献类型：
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作者：
Ablikim M.;Achasov M. N.;Adlarson P.;Ahmed S.;Albrecht M.;Aliberti R.;Amoroso A.;An M. R.;An Q.;Bai X. H.;Bai Y.;Bakina O.;Ferroli R. Baldini;Balossino I;Ban Y.;Begzsuren K.;Berger N.;Bertani M.;Bettoni D.;Bianchi F.;Bloms J.;Bortone A.;Boyko I;Briere R.
本文利用BEPCII上的BESIII探测器所收集的对应于积分光度的事件数据样本，测量了1000nm处的自旋极化。极化的意义被发现是包括系统的不确定性，这意味着零相位之间的过渡振幅的螺旋状态。这一阶段可以用心灵形态因素来解释，并被确定为。类似地，发现形状因子之间的比率为。第一个不确定性是统计性的，第二个是系统性的。
Using a data sample ofevents collected with the BESIII detector at BEPCII corresponding to an integrated luminosity of, we report a measurement ofspin polarization inat. The significance of polarization is found to beincluding the systematic uncertainty, which implies a zero phase between the transition amplitudes of thehelicity states. This phase can be interpreted in terms of psionic form factors, and is determined to be. Similarly, the ratio between the form factors is found to be. The first uncertainties are statistical and the second systematic.